ABB OTM_C_21D User manual

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INSTALLATION AND OPERATING INSTRUCTION

Automatic Transfer Switch

OTM_C_21D

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Automatic Transfer switch

34OTM_C_21D rev. B / 1SCC303015M0201 / EN

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Table of contents

003 – 004 Symbols & Terms

005 – 008 Product overview

009 – 012 Quick start

013– 016 Interface and Settings

017 Technical data

018 – 020 Installation

021 – 022 Optional accessories

023 Maintenance and common troubleshooting

024 Appendix

AUTOMATIC TRANSFER SWITCH, OTM_C_21D

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Symbols & Terms

Risk of Electric shock: Warns about a situation where a hazardous voltage may cause

physical injury to a person or damage to equipment.

General warning: Warns about a situation where something other than electrical

equipment may cause physical injury to a person or damage to equipment.

Caution: Provides important information or warns about a situation that may have a

detrimental effect on equipment.

Information: Provides important information about the equipment.

Table 1. Explanations of abbreviations and terms

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Explanations of abreviations and terms

OTM_C_21D Automatic transfer switch, the type name

LN1-Switch I Power supply line, e.g. the primary line

LN2-Switch II Power supply line, e.g. the secondary line used in emergency cases

EMERG OFF

(fire control system)

Used to drive the automatic transfer switch transfers to the “O” position when

receiving EMRG OFF signal.

AUTO Automatic mode

Remote test A sequence to test the functionality of the automatic transfer switch

Ts Switching delay

TBs Back switching delay

OV Adjustable overvoltage threshold

UV Adjustable undervoltage threshold

4AUTOMATIC TRANSFER SWITCH, OTM_C_21D

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Product overview

The OTM_C_21D automatic transfer switch can be

used as a source transfer switch in a threephase or

single-phase networks. Monitored conditions are,

no-voltage, phase-loss, overvoltage and under-

voltage detection, transfer delays, generator start

and stop, and remote test function.

Source transfer can be performed using a manu-

ally operated handle, locally using push buttons or

fully automatically. The automatic mode includes

several operating methods: Line 1 priority, no line

priority and manual back switching mode.

The standard package includes:

1. automatic transfer switch, 2. handle, 3. handle storage clip and 4. terminal plug.

Figure 1. OTM_C_21D automatic transfer switch

1. Handle for manual operation

2. Place for auxiliary contact blocks

3. Push button

4. Mimic panel

5. Voltage sensing connections

6. Locking clip for padlock

7. Locking latch for releasing the handle and

locking electrical control

8. Locking clip for locking manual operation

9. Dip switches

10. Rotary switches

11. Connecting terminal

10 4 5

8 1 3 6 2

AUTOMATIC TRANSFER SWITCH, OTM_C_21D

OTM_C_21D switching sequence

Line 1 Priority (default mode)

The switching sequence of OTM_C_21D can be

summarized in following steps:

The back switching sequence can be summarized

in the following steps:

• The Line 1 will start the normal functioning

• Back switching delay Tbs

• Change-over switch (Switch II) to the position 0

• Change-over switch (Switch I) to the position I

• Generator stop delay Gs

• Generator stop

Figure 2. Automatic Switching Sequences in OTM_C_21D, Line 1 priority

LN1

LN2

Switch I status

Switch II status Ts TBs

• An anomaly occurs on the Line 1 (LN1)

• Switching delay Ts, in case of phase loss, over-

voltage and undervoltage conditions

• Generator start, immediate start generator

in case of black-out, in case of phase-loss,

overvoltage or undervoltage after switching

delay Ts. (if Generator mode is selected)

• Change-over switch (Switch I) to the position 0

• Change-over switch (Switch II) to the position II

6AUTOMATIC TRANSFER SWITCH, OTM_C_21D

• An anomaly occurs on the Line 1 (LN1)

• Switching delay Ts, in case of phase-loss, over-

voltage and undervoltage conditions

• Change-over switch (Switch I) to the position 0

• Change-over switch (Switch II) to the position II

The back switching sequence can be summarized

in the following steps:

• The Line 1 will start the normal functioning

• Change-over switch stays in position II

• An anomaly occurs on the Line 2 (LN2)

• Back switching delay

• Change-over switch (Switch II) to the

position 0

• Change-over switch (Switch I) to the position I

Figure 3. Automatic Switching Sequences in OTM_C_21D, No line priority

LN1

LN2

Switch I status

Switch II status Ts TBs

Generator is disabled in no line priority.

Keep generator off in this mode.

The switching sequence of OTM_C_21D can be

summarized in following steps:

No line priority

AUTOMATIC TRANSFER SWITCH, OTM_C_21D

• An anomaly occurs on the Line 1 (LN1)

• Switching delay Ts, in case of phase-loss, over-

voltage and under voltage conditions

• Generator start, immediate start generator in

case of black-out, in case of phase-loss, over-

voltage or undervoltage after switching delay

Ts (if Generator mode is selected)

• Change-over switch (Switch I) to the

position 0

• Change-over switch (Switch II) to the

position II

Figure 4. Automatic Switching Sequences in OTM_C_21D, Manual back switching mode

LN1

LN2

Switch I status

Switch II status Ts

The back switching sequence can be

summarized in the following steps:

• The Line 1 will start the normal functioning

• Change-over switch stays in position II

• An anomaly occurs on the Line 2 (LN2)

• Change-over switch stays in position II

• Change-over switch can be trans ferred

manually back to position I

The switching sequence of OTM_C_21D can be

summarized in following steps:

Manual back switching mode

8AUTOMATIC TRANSFER SWITCH, OTM_C_21D

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Quick start

To operate the switch manually:

1. Attach the handle to the switch panel. You can

attach the handle in any position.

Figure 5. Operating the switch manually

When the handle is attached, the switch will automatically be in “manual mode” with the

automatic operation disabled.

Do not tamper with wires when the transfer switch is powered on.

Before powering on the transfer switch, please manually operate it to ensure it can oper-

ates and moves normally.

Then power supply is normal and without the handle attached or EMRG OFF signals, the

switch will be in automatic mode and switch to the primary line upon initial power-up.

Keep the handle attached if you do not want the switch to be in automatic mode upon

initial power-up.

2.When the handle is attached, the automatic

transfer switch will automatically be in

Manual-mode and won’t operate automatically

in case of line failure. The AUTO LED on the

mimic panel is OFF.

AUTOMATIC TRANSFER SWITCH, OTM_C_21D

To operate the switch electrically:

If the handle inserted:

1. Press handle locking clip and remove the handle

from the switch.

2. Press “AUTO” button and the “AUTO” LED will

be ON, indicating automatic mode.

Figure 6. Selecting the automatic transfer OTM_C_21D switch to Auto Mode

Automatic operation

OTM_C_21D must be in automatic mode and the

“AUTO” LED is on in order that the switch can per-

form automatic transfer cycles according to the

preset operating mode.

If handle is not inserted

1. If “AUTO” LED blinks, press “AUTO” button and

the “AUTO” LED will be ON, indicating

automatic mode.

2. Automatic operation includes three operating

modes: Line 1 priority (factory default setting),

No line priority, and manual back switching

mode.

System testing

Local test

In automatic mode, “AUTO” LED is ON and you

can transfer the switch using I, O, and II push but-

tons on the front panel of the switch. Press

“AUTO” button to return the automatic operation.

10 AUTOMATIC TRANSFER SWITCH, OTM_C_21D

Figure 7. Remote test connection in OTM_C_21D

In the test sequence, the main power supply circuit will be closed.

If the test sequence is interrupted due to power failure, the automatic transfer switch will

enter "automatic mode" after power recovery.

e.g., when the switch is in Position I:

Enter test signals; the switch transfers to

Position O à to Position II à to Position O à to

Position I. Entering test signals is invalid

before the automatic transfer switch returns

to its original position.

Under test mode, press the “AUTO” button to

cancel test mode and return to automatic

mode. The “Auto” LED will be “ON” as normal.

4. After the remote test finishes, the OTM_C_21D

automatically returns to the automatic mode

(“AUTO” LED is on).

Remote test

The procedure of the remote test is as follows:

1. Connect to the remote test signal according to

Figure 7.

2. Ensure that the OTM_C_21D is in automatic

mode (“AUTO” LED is on).

3. Short circuit the remote test signal for at least

100 ms until the “AUTO” LED blinks to enter the

test mode. Under test mode, the automatic

transfer switch will simulate switching cycle

and finally return to its original position prior

to the activation of the test mode.

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