Littelfuse SE-330 User manual

Tel: (800) 832-3873

Email: [email protected]

www.littelfuse.com/SE-330

Document Number: PM-1200-EN

SE-330 MANUAL

NEUTRAL-GROUNDING-RESISTOR MONITOR

REVISION 11-A-063018

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TABLE OF CONTENTS

1 GENERAL

............................................................................1

1.1 Modern Resistance-Grounded Systems.....................1

1.2 SE-330 NGR Monitoring .............................................1

1.3 NGR Short Detection ..................................................2

2 OPERATION

........................................................................2

2.1 Settings......................................................................2

2.1.1 GF Trip Time ............................................................2

2.1.2 GF Trip Level............................................................2

2.1.3 VNTrip Level............................................................2

2.1.4 Pulse-Period Adjustment ........................................3

2.1.5 Conguration Settings............................................4

2.1.5.1 Relay K1 Function (S1).........................................4

2.1.5.2 Trip-Relay Mode and

Trip-Memory Mode (S2)...................................................4

2.1.5.3 Ground-Fault-Trip Latch (S3) ................................4

2.1.5.4 Resistor-Fault-Trip Latch (S4)...............................4

2.1.5.5 Sensing-Resistor Selection (S5) ..........................4

2.1.5.6 Frequency (S6) .....................................................4

2.1.5.7 Upgrade Mode (S8) .............................................4

2.1.6 Resistor-Fault Trip Time ..........................................4

2.1.7 Resistor-Fault Trip Level ........................................4

2.1.8 Geo-Magnetic Filter................................................4

2.2 Calibration .................................................................5

2.3 Pulsing Operation ......................................................5

2.4 Trip Indication and Reset ...........................................5

2.5 Remote Operation......................................................5

2.6 Relay K1 LED..............................................................6

2.7 Unit Healthy Output...................................................6

2.8 Diagnostic LED...........................................................6

2.9 Enhanced Health Status ............................................6

2.10 Analog Output..........................................................6

3 INSTALLATION

..................................................................6

3.1 SE-330........................................................................6

3.2 Sensing Resistor......................................................12

3.3 Ground-Fault CT.......................................................20

3.4 Isolated Ground Connection ....................................24

3.5 Pulsing Connection ..................................................24

4 DATA INTERFACES

..........................................................25

4.1 SD Card....................................................................25

4.1.1 Datalogging ..........................................................25

4.1.2 Firmware Upgrade ................................................25

4.2 USB Interface...........................................................25

4.3 Network Communications .......................................26

5 TROUBLESHOOTING

.......................................................27

6 TECHNICAL SPECIFICATIONS

.......................................29

6.1 SE-330......................................................................29

6.2 Sensing Resistors ....................................................31

6.3 Current Sensors .......................................................32

LIST OF FIGURES

1 Conguration switches......................................................... 4

2 Analog-output connections.................................................. 6

3 SE-330 connection diagram ................................................. 7

4 SE-330 outline and panel-mounting details......................... 8

5 SE-330 outline and surface-mounting details...................... 9

6 SE-IP65CVR-G weatherproof cover outline........................ 10

7 SE-IP65CVR-G weatherproof cover installation................. 11

8 ER-600VC sensing resistor................................................. 12

9 SE-MRE-600 moisture-resistant enclosure outline ........... 13

10 ER-600VC installed in SE-MRE-600 ................................... 14

11 ER-5KV sensing resistor..................................................... 15

12 ER-5WP sensing resistor.................................................... 16

13 ER-15KV sensing resistor................................................... 17

14 ER-25KV sensing resistor................................................... 18

15 ER-35KV sensing resistor................................................... 19

16 ELCT5-88 and ELCT30-88 ground-fault current sensors .... 21

17 ELCT5-31 and ELCT30-31 ground-fault current sensors .... 22

18 RK-332 remote indication and reset .................................. 23

19 PGA-0520 analog percent current meter ........................... 23

20 Simplied isolated-ground connection .............................. 24

21 Simplied pulsing connection............................................ 24

22 Ground-fault test circuits ................................................... 36

LIST OF TABLES

1 Typical tripping system values ............................................. 3

2 Ground-fault trip levels for selected CTs ............................. 3

3 Ground-fault-test record..................................................... 36

DISCLAIMER

Speciﬁcations are subject to change without notice. Littelfuse,

Inc. is not liable for contingent or consequential damages or for

expenses sustained as result of incorrect application, incorrect

adjustment, or malfunction.

7 ORDERING INFORMATION

.................................................. 34

8 WARRANTY

.......................................................................... 35

9 TEST PROCEDURES............................................................ 35

9.1 Resistor-Fault Tests ...................................................... 35

9.1.1 Calibration and Open Test......................................... 35

9.1.2 Voltage Test............................................................... 35

9.2 Sensing-Resistor Test................................................... 35

9.3 Analog-Output Test ...................................................... 36

9.4 Ground-Fault Performance Test.................................... 36

APPENDIX A SE-330 REVISION HISTORY.......................... 37

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1. GENERAL

1.1 Modern Resistance-Grounded Systems

A high-resistance-grounded system uses a neutral-grounding

resistor (NGR) with a low let-through current to limit the ground-

fault current. This is an improvement from low-resistance and

solidly grounded systems, which do not use NGRs and therefore

have a ground-fault ﬂash hazard that can cause substantial point-

of-fault damage. High-resistance grounding eliminates these

problems. Modern ground-fault protection reliably operates at low

current levels. Furthermore, the probability of an arc-ﬂash incident

is signiﬁcantly reduced in high-resistance-grounded systems.

NGR selection depends on system charging current and whether

the system is an alarm-only or a tripping system. Alarm-only

systems are usually restricted to system voltages up to 5 kV with

NGR let-through currents of 5 A or less. Occasionally, alarm-only

systems up to 15 kV and 10 A are used, however, these systems

are not common because a ground fault on such a system tends

to escalate to a phase-to-phase fault before the ground fault can

be located and cleared. Consult Canadian Electrical (CE) Code rule

10-302, National Electric Code (NEC)* 250.36, and NEC 250.186 for

application details.

System charging current is the capacitive current that ﬂows

to ground when a bolted ground fault occurs. This current can

be calculated or measured. For small systems, the magnitude of

charging current may be conservatively estimated as ½ A per 1,000

kVA in low-voltage systems and 1 A per 1,000 kVA in medium-

voltage systems.

In an alarm-only system or in a tripping system without selective

coordination, use an NGR with a let-through current larger than the

system charging current. Set the pick-up current of ground-fault

devices at or below 50% of the NGR let-through current.

In a tripping system with selective coordination, use ground-fault

devices that have a deﬁnite-time characteristic to achieve time

coordination. Use the same pick-up current for all ground-fault

devices, which must be a larger value than the charging current

of the largest feeder. Select an NGR with a let-through current

between ﬁve and 10 times the pick-up current of the ground-fault

devices.

Do not use a grounding transformer with a low-voltage resistor:

• The combined cost of a transformer and a low-voltage resistor

is more than the cost of a resistor that is rated for line-to-

neutral voltage.

• A transformer saturated by a ground fault through a rectiﬁer

can make ground-fault protection inoperative.

• Transformer inrush current up to 12 times the rated current can

cause a voltage that is larger than expected.

• A parallel transformer winding makes it difﬁcult to monitor

NGR continuity.

• A transformer can provide the inductance necessary to cause

ferroresonance if the NGR opens.

Following these guidelines will reduce the ﬂash hazard, reduce

point-of-fault damage, achieve reliable ground-fault protection, and

ensure a stable system not subject to ferroresonance.

1.2 SE-330 NGR Monitoring

The SE-330 is a microprocessor-based NGR monitor that detects

NGR failures and ground faults in resistance-grounded systems and

is compliant with the 2018 CE Code. The SE-330 measures NGR

resistance, NGR current, and transformer or generator neutral-to-

ground voltage. The components required to monitor an NGR are

an SE-330, a 20- or 100-kΩ ER-series sensing resistor, and a current

transformer (CT).

Power-circuit elements (other than neutral-connected NGRs)

that purposefully connect the power system to ground are often

not compatible with SE-330 NGR monitoring. These elements

include single-phase grounding transformers, grounded-wye-

primary potential transformers, and grounded-wye-primary power

transformers.

The SE-330 continuously measures NGR resistance in an

unfaulted system. It will trip on resistor fault if the NGR resistance

varies from its calibrated value. When a ground fault occurs, voltage

is present on the neutral. NGR current will ﬂow if the NGR is healthy.

The SE-330 will trip on ground fault if fault current exceeds the GF

TRIP LEVEL setting for an interval equal to the GF TRIP TIME setting.

However, if the NGR fails open during a ground fault, it is possible

for fault resistance to satisfy the NGR resistance measurement. To

detect this double-fault condition, the SE-330 measures neutral

voltage. If neutral voltage exceeds the VNTRIP LEVEL setting and if

NGR current is less than 5% of the CT rating, the SE-330 will trip on

resistor fault. If the resistor-fault circuit is tripped and the neutral

voltage exceeds the VNTRIP LEVEL setting for an interval greater

than the GF TRIP TIME setting, the ground-fault circuit will also trip.

Ground-fault current is sensed by a CT with a 1- or 5-A secondary,

or by a CT (ELCT5-x or ELCT30-x) with a 50-mA secondary. The trip

level of the ground-fault circuit is adjustable from 2 to 100% of the

CT rating. The trip time is adjustable from 0.1 to 10.0 seconds.

The SE-330 has four output relays. With ﬁrmware version 3.00 or

higher, relays K1, K2, and K3 can be assigned to one of the following

functions (using SE-MON330 version 4.0 or higher):

• Ground Fault (GF);

• Resistor Fault (RF);

• Enhanced Health Status (HEALTH);

• GF + RF;

• GF + RF + HEALTH; or

• DISABLED.

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SE-330 Neutral-Grounding-Resistor Monitor

In addition to the selected function, K1 is also assigned a trip or

pulsing function. When the pulsing function is selected, relay K1

is used to control a contactor to assist in locating faults. Relays

K1, K2, and K3 can be set to operate in the fail-safe or non-fail-

safe mode for undervoltage or shunt-trip applications. Relay K4 is a

solid-state relay that provides basic UNIT HEALTH indication.

Additional features include LED trip indication, trip memory,

front-panel and remote reset, 4-20-mA analog output, trip event

recorder, USB local communications, microSD* data logging, and

optional network communications.

The SE-330 provides additional features over the SE-330 legacy

model (revision 04 or less):

• NGR short detection capability.

• Conﬁgurable output relay function and operating mode (K1,

K2, and K3).

• When the trip level is set to MEM, the ground-fault trip setting

is deﬁned by an internal non-volatile memory variable. The

range is 2 to 100% in 1% increments of the CT-primary rating.

• The number of trip records has been increased to 100 and

includes date and time stamping.

• A microSD card interface can be used for short-term data

logging and ﬁrmware updates. A microSD card is included.

See Section 4.1.

• For ease of connection to new devices, the RS-232 interface

has been replaced by a Mini-B USB port.

• Dual Ethernet ports are available with support for ﬁber-optic

and RJ45 interfaces.

• An added IEC61850 protocol.

1.3 NGR Short Detection (ﬁrmware version 3.00 and higher)

The SE-330 can be conﬁgured to monitor and trip if the NGR

resistance decreases to a value less than 10 to 70% of the Nominal

NGR Resistance value. The Nominal NGR Resistance, NGR Short

Trip Level, and several other values can be conﬁgured using SE-

MON330 (version 4.0 or higher). Refer to the SE-MON330 manual

for further details.

2. OPERATION

2.1 Settings

2.1.1 GF Trip Time

GF TRIP TIME (deﬁnite time) is adjustable from 0.1 to 10.0

seconds. Time-coordinated ground-fault protection requires this

setting to be longer than the trip times of downstream ground-fault

devices.

A trip-time accumulator provides a ground-fault memory function

for detection of intermittent faults. The accumulated time increases

when a ground fault is detected and decreases when a ground fault

is not detected. A trip will eventually occur when the time for fault

current above the trip level is greater than the time for fault current

below the trip level.

A non-accumulating mode can also be selected. In this mode, a

trip occurs if the fault current remains higher than the ground-fault

trip level for the duration of the ground-fault trip time.

2.1.2 GF Trip Level

The SE-330 uses a Discrete-Fourier Transform (DFT) algorithm to

measure the fundamental component of NGR current.

Choose an NGR let-through current and a ground-fault trip

level using the guidelines in Section 1.1. Set the ground-fault

trip level between 2 and 100% of the CT-primary rating. When

the ground-fault trip level is set to MEM, the ground-fault setting

that is stored in non-volatile memory is used. This parameter

must be set using a PC running the SE-MON330 software and

connected to the USB interface. The setting range is 2 to 100%

of CT primary rating in 1% increments. The default value is 15%.

Inputs are provided for 5-, 1-, and 0.05-A secondary CTs. Typical

values for 5-, 15-, and 25-A tripping systems are shown in Table 1.

Ground-fault trip levels for the selected CTs are shown in Table 2.

For other systems, refer to the NGR Monitor Set-Point Assistant

at www.littelfuse.com/relayscontrols. The Set-Point Assistant is

included with the SE-MON330 software.

2.1.3 VNTrip Level

The SE-330 uses a DFT algorithm to measure the fundamental

component of neutral voltage (VN).

The SE-330 will trip and indicate a resistor fault if neutral voltage

is greater than the VNTRIP LEVEL setting for the duration of the

resistor-fault trip time, and ground-fault current is less than 5% of

the CT rating. If the resistor-fault circuit is tripped and the neutral

voltage exceeds the VNTRIP LEVEL setting for an interval greater

than the GF TRIP TIME setting then the ground-fault circuit will

also trip.

The VNTRIP LEVEL range is 20 to 2,000 V when switch S5 is in the

20-kΩ (Vx1) position, and the range is 100 to 10,000 V when switch

S5 is in the 100-kΩ (Vx5) position. Calculate the voltage across the

NGR when the NGR current is equal to the pick-up current of the

ground-fault circuit. Set the VNTRIP LEVEL to the next largest value.

See Fig. 1 and Section 2.1.5.5.

Typical values for 5- 15-, and 25-A tripping systems are shown

in Table 1. For an NGR resistance greater than 2 kΩ, use a 100-kΩ

sensing resistor. For other systems, refer to the NGR Monitor Set-

Point Assistant at www.littelfuse.com/relayscontrols.

NOTE: A resistor-fault trip is inhibited if the ground-fault current is

above 5% of the CT rating.

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SE-330 Neutral-Grounding-Resistor Monitor

TABLE 1. Typical tripping system values

TABLE 2. Ground-fault trip levels for selected CTs

SYSTEM

VOLTAGE

(LINE-TO-LINE)

NEUTRAL-GROUNDING

RESISTOR SENSING RESISTOR GROUND-FAULT

TRIP LEVEL VNTRIP LEVEL

(VOLTS) CURRENT

(AMPERES)

RESISTANCE

(OHMS) MODEL

RESISTANCE

(SWITCH S5

SETTING)

(AMPERES) (VOLTS)

480 5 55 ER-600VC 20 kΩ 1.0 60

600 5 69 ER-600VC 20 kΩ 1.0 100

2,400 5 277 ER-5KV 20 kΩ 1.0 340

4,160 5 480 ER-5KV 20 kΩ 1.0 800

480 15 18 ER-600VC 20 kΩ 3.0 60

600 15 23 ER-600VC 20 kΩ 3.0 100

2,400 15 92 ER-5KV 20 kΩ 3.0 340

4,160 15 160 ER-5KV 20 kΩ 3.0 800

7,200 15 277 ER-15KV 100 kΩ 3.0 170x5 = 850

14,400 15 554 ER-15KV 100 kΩ 3.0 340x5 = 1,700

4,160 25 96 ER-5KV 20 kΩ 5.0 800

7,200 25 166 ER-15KV 100 kΩ 5.0 170x5 = 850

14,400 25 332 ER-15KV 100 kΩ 5.0 340x5 = 1,700

25,000 25 577 ER-25KV 100 kΩ 5.0 800x5 = 4,000

35,000 25 808 ER-35KV 100 kΩ 5.0 1,200x5 = 6,000

GF TRIP

LEVEL(%)(1)

ELCT5-x

EFCT-x

5:0.05

(AMPERES)

ELCT30-x

SE-CS30-x

30:0.05

(AMPERES)

50:1

50:5

(AMPERES)

100:1

100:5

(AMPERES)

200:1

200:5

(AMPERES)

400:1

400:5

(AMPERES)

2 0.10 0.60 * * * *

4 0.20 1.20 * * * 16

6 0.30 1.80 * * 12 24

8 0.40 2.40 * 8 16 36

10 0.50 3.00 5 10 20 40

20 1.00 6.00 10 20 40 80

40 2.00 12.00 20 40 80 160

60 3.00 18.00 30 60 120 240

80 4.00 24.00 40 80 160 320

100 5.00 30.00 50 100 200 400

2.1.4 Pulse-Period Adjustment

Pulse period is the cycle time of relay K1 when the SE-330 is

conﬁgured for pulsing operation. Pulse period is adjustable from 1.0

to 3.0 seconds with a ﬁxed duty cycle of 50 percent. For example,

with the 1.0-s setting, relay K1 will be energized for 0.5 seconds

and de-energized for 0.5 seconds when pulsing is enabled.

See Section 2.3 for detailed pulsing operation information.

NOTE: For pulsing conﬁguration, set switch S1 to K1 = PULSING

and install an external pulse-enable switch.

(1) When set to MEM, range is 2 to 100% in 1% increments.

* Setting not recommended.

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SE-330 Neutral-Grounding-Resistor Monitor

2.1.5 Conguration Settings

Eight conﬁguration switches (S1 to S8) and a calibration button

are located behind the access cover on the front panel. See Fig. 1.

2.1.5.1 Relay K1 Function (S1)

Set switch S1 to K1 = TRIP to assign the trip function to relay K1

and to activate switch S2. With the default setting, relay K1 will

change state when a resistor-fault or ground-fault trip occurs. Other

trip functions can be assigned to K1 using SE-MON330 software or

via network communications.

Set switch S1 to K1 = PULSING to conﬁgure relay K1 for pulsing

operation. See Section 2.3.

2.1.5.2 Trip-Relay Mode And Trip-Memory Mode (S2)

Set switch S2 to select the operating mode of trip relay K1. In the

non-fail-safe mode, relay K1 energizes and its contact closes when

a trip occurs. The non-fail-safe mode can be used to trip shunt-trip

circuit breakers. In the non-fail-safe mode, SE-330 trips are reset

when supply voltage is cycled.

In the fail-safe mode, relay K1 energizes and its contact will

close if there are no trips. The contact will open in the event of a

trip, a loss of supply voltage, or a processor failure. In the fail-safe

mode, SE-330 trips are not reset when the supply voltage is cycled.

NOTE: Switch S2 does not affect the operating modes of relays

K2, K3, and K4.

NOTE: Switch S2 only affects relay K1 operating mode when K1 is

assigned the trip function (switch S1 set to K1 = TRIP). Trip memory

is enabled when K1 is set to the fail-safe mode, regardless of the

switch S1 setting.

2.1.5.3 Ground-Fault-Trip Latch (S3)

Set switch S3 to select latching or non-latching ground-fault-

circuit operation. Non-latching operation overrides ground-fault-trip

memory. See Sections 2.1.5.2 and 2.4.

2.1.5.4 Resistor-Fault-Trip Latch (S4)

Set switch S4 to select latching or non-latching resistor-fault-

circuit operation. Non-latching operation overrides resistor-fault-

trip memory. See Sections 2.1.5.2 and 2.4.

2.1.5.5 Sensing-Resistor Selection (S5)

Set switch S5 to the resistance of the sensing resistor. For the

ER-600VC, ER-5KV, and ER-5WP, select 20 kΩ. For the ER-15KV, ER-

25KV, and ER-35KV, select 100 kΩ. Switch S5 sets the resistor-fault

trip value and the VNTRIP LEVEL range. See Section 2.1.3.

2.1.5.6 Frequency (S6)

Set switch S6 to 50 or 60 Hz to tune the digital ﬁlter to the line

frequency of the monitored system.

2.1.5.7 Upgrade Mode (S8)

The microSD card is used for ﬁrmware upgrades. See Section

4.1.2 for upgrade instructions.

NOTE: An upgrade causes an SE-330 restart and this may cycle the

output relays.

2.1.6 Resistor-Fault Trip Time

The resistor-fault trip time can be adjusted from from 12 seconds

(the default) to as much as 60 seconds using the SE-MON330

software or via network communications.

2.1.7 Resistor-Fault Trip Level

The resistor-fault trip level can be adjusted using the SE-MON330

software or via network communications. See Section 6.1.

2.1.8 Geo-Magnetic Filter

A low-frequency ground current can be caused by the Earth’s

magnetic ﬁeld and from charged clouds passing overhead during

a thunderstorm. In some conditions, this can cause a false resistor-

fault trip. Enabling the geo-magnetic ﬁlter and increasing the

resistor-fault trip time can help counteract these effects.

A trip time of 30 seconds is recommended when the

geo-magnetic ﬁlter is enabled.

The geo-magnetic ﬁlter is disabled by default but can be enabled

using the SE-MON330 software or via network communications.

CALIBRATION BUTTON

K1 =TRIP

K1 FAIL-SAFE

LATCHING GF TRIP

LATCHING RF TRIP

20 kΩ

50 Hz

NOT USED

RUN

NOTE:

1. DEFAULT SETTINGS SHOWN.

S1 K1 = PULSING

K1 NON-FAIL-SAFE

NON-LATCHING GF TRIP

NON-LATCHING RF TRIP

100 kΩ

60 Hz

UPGRADE

FIG. 1. Conﬁguration switches.

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SE-330 Neutral-Grounding-Resistor Monitor

2.2 Calibration

The SE-330 measures the resistance change of the NGR

relative to the NGR-resistance value that was determined at the

time of calibration. When the resistance change is greater than

the threshold amount (500 Ω for 20-kΩ systems and 2,500 Ω for

100-kΩ systems), a resistor-fault trip will occur. The SE-330 should

be calibrated for new installations, or if the NGR or the sensing

resistor is changed.

NOTE: If the SE-330 is not calibrated and is supplied from the load

side of the breaker (non-fail-safe mode), calibrate it within the

resistor-fault trip time after power-up or it may trip and interrupt its

supply. See Section 2.1.6.

The CALIBRATION button is located behind the access cover on

the front panel, and is recessed to prevent inadvertent activation.

NOTE: Calibration must be performed with the SE-330 connected

to the sensing resistor and NGR of the installed system.

To calibrate the SE-330, press and hold the CALIBRATION

button until the green CALIBRATED LED turns off and then turns

on (if the LED is already off, press and hold down the button until

the LED turns on). Calibration takes approximately two seconds.

If calibration is not successful a resistor-fault trip occurs, the

RESISTOR FAULT TRIP LED will be on, the CALIBRATED LED will be

off, and the DIAGNOSTIC LED will ﬂash the calibration-error code.

See Section 2.8.

The SE-330 may be calibrated remotely using the SE-MON330

software with the USB interface or the communications options.

If the resistor fault (switch S4) is selected, the calibration-error

code ﬂashes until RESET is pressed even if the CALIBRATED LED is

on.

The calibration value is stored in non-volatile memory.

2.3 Pulsing Operation

If switch S1 is set to K1 = PULSING, pulsing occurs when terminal

16 is connected to terminal 17. Relay K1 operates at a 50% duty

cycle. The duration of each cycle can be adjusted from 1.0 to 3.0

seconds. When terminals 16 and 17 are not connected, K1 is not

energized and its contact is open.

Relay K1 can be used to control a contactor that is rated for use

at the line-to-neutral voltage. The contactor causes changes in

neutral-to-ground resistance by adding or shorting portions of the

NGR. See Section 3.5. Pulsing ground-fault current appears as zero-

sequence current upstream from the fault.

Pulsing ground-fault current is distinguishable from charging

current and noise, and it can be traced with a clip-on ammeter or

current probe. If a pulsing current is detected on a cable or conduit,

then the fault is downstream. Systematic testing allows faults to be

located without isolating feeders or interrupting loads.

Stop pulsing when a fault is located.

2.4 Trip Indication And Reset

Red LEDs and indication relays indicate ground-fault and

resistor-fault trips. The indication relays K2 (default is GF) and K3

(default is RF) operate in either fail-safe or non-fail-safe mode. The

default is non-fail-safe mode. In this mode, the relays are energized

when a fault occurs. The relay mode setting is stored in non-volatile

memory and can be set using the SE-MON330 software or network

communications.

When a trip occurs with latching operation selected, the

SE-330 remains tripped until the unit is reset with the front-panel

RESET button or the remote-reset input. See Sections 2.1.5.3 and

2.1.5.4. Terminals 15 and 16 are provided for remote reset as

shown in Fig. 3. The reset circuit responds only to a momentary

closure so that a jammed or shorted button does not prevent a trip.

The front-panel RESET button is inoperative when terminal 15 is

connected to terminal 16. If non-latching operation is selected, trips

and corresponding indication will automatically reset when the

fault clears. In addition, the power-up trip memory will be ignored

even when conﬁguration switch S2 is set to fail-safe. The maximum

automatic reset time is 2.8 s.

The red DIAGNOSTIC LED annunciates latched calibration-error

and remote trips. See Section 2.8.

When supply voltage is applied with switch S2 set to

FAIL-SAFE, then the SE-330 returns to its state prior to loss of

supply voltage unless switch S3 or S4 is set to non-latching. SE-330

trips reset when the supply voltage is applied with switch S2 set to

NON-FAIL-SAFE. When a local, remote, or network reset is issued,

both trip LEDs will ﬂash if they are off.

Resistor-fault-trip reset can take up to one second.

Resistor-fault trip-memory trip can take up to three seconds once

the relay powers up.

2.5 Remote Operation

Relays K2 and K3 can be used for remote indication, and terminals

15 and 16 are provided for remote reset. RK-332 Remote Indication

and Reset components are shown in Fig. 18. Connect them as

shown in Fig. 3. RK-332 components are not polarity sensitive.

Indication relays can be set to fail-safe or non-fail-safe operation

using the SE-MON330 software or network communications. The

default mode is non-fail-safe. In non-fail-safe mode, relays energize

on fault.

Network-enabled SE-330s can be remotely tripped and reset by

the network master. The red DIAGNOSTIC LED indicates a network-

initiated trip. See Section 2.8. Refer to the appropriate SE-330

communications manual.

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SE-330 Neutral-Grounding-Resistor Monitor

2.6 Relay K1 LED

The yellow RELAY K1 LED follows the state of relay K1 and is on

when K1 is energized (contact closed).

2.7 Unit Healthy Output

The UNIT HEALTHY relay K4 provides a basic status of processor

health, which is energized when the processor is operating. It can

be ordered with N.O. or N.C. contacts. See section 7.

An ENHANCED HEALTH status can be assigned to relays K1, K2,

and K3. See Section 2.9.

UNIT HEALTHY relay K4 is energized when the processor is

operating. It can be ordered with N.O. or N.C. contacts. See Section 7.

NOTE: The K4 output changes state momentarily during a

processor reset.

NOTE:K4-contact rating is 100 mA maximum.

2.8 Diagnostic LED

The DIAGNOSTIC LED is used to annunciate trips without

individual LED indication. The number of short LED pulses between

pauses indicates the cause of the trip.

By default, only critical diagnostic ﬂash codes are shown. Non-

critical diagnostic codes include SD Card status and USB Error

status. All other diagnostic codes are considered critical.

Starting with SE-330 ﬁrmware version 2.60 and SE-MON330

software version 3.8, the SE-330 can be conﬁgured to show

only critical diagnostic codes. In this conﬁguration, only critical

diagnostic codes will be indicated with the DIAGNOSTIC LED.

Diagnostic messages are always visible with the SE-MON330

software. See Sections 4.2 and 5.

2.9 Enhanced Health Status

The Enhanced Health Status can be assigned to relays K1, K2,

and K3 (ﬁrmware version 3.00 and higher). The assigned relay(s)

will trip when a critical diagnostic code occurs. See Section 5 for a

list of critical diagnostic codes.

2.10 Analog Output

An isolated 4–20-mA output indicates NGR current with full-

scale output corresponding to the CT rating. An internal 24-VDC

supply allows the analog output to be connected as a self-powered

output. Power from an external supply is required for loop-powered

operation. See Fig. 2. A PGA-0520 analog meter can be panel-

mounted to display the NGR current. See Fig. 19 and Section 7.

3. INSTALLATION

3.1 SE-330

Outline and panel-cutout dimensions for the SE-330 are shown

in Fig. 4. To panel mount the SE-330, insert it through the panel

cutout and secure it with the four included 8-32 locknuts and ﬂat

washers.

If an optional SE-IP65CVR-G hinged cover is used, follow the

included installation instructions. See Figs. 6 and 7.

All connections to the SE-330 are made with plug-in, wire-

clamping terminal blocks. Each plug-in terminal block can be secured

to the SE-330 by two captive screws for reliable connections.

Outline dimensions and mounting details for surface mounting

the SE-330 are shown in Fig. 5. Fasten the optional surface-mount

adapter to the mounting surface and make connections to the

adapter terminal blocks. Follow Fig. 5 instructions to mount or

remove the SE-330.

Ground terminal 7 (G) and connect terminal 6 (R) to the sensing-

resistor R terminal.

Use terminal 1 (L1) as the line terminal on ac systems, or the

positive terminal on dc systems. Use terminal 2 (L2/N) as the

neutral terminal on ac systems or the negative terminal on dc

systems. Connect terminal 3 ( ) to ground.

NOTE: Disconnect terminal 1 (L1) and terminal 2 (L2/N) before

performing dielectric strength testing of the control panel.

NOTE: Connections to terminals 4 (SPG) and 5 (SPGA) are not

required when using the SE-330 hardware revision 10 and higher.

However, it is recommended to connect terminal 4 to terminal 5

to maintain backwards compatibility with the older SE-330 series

(hardware revision 04A and lower).

FIG. 2. Analog-output connections.

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