Mikro DPM380 User manual
Digital Power Meter User Manual
DPM380/DPM380B
No.3, JalanAnggerik Mokara 31/48, Seksyen 31, Kota Kemuning, 40460 ShahAlam, Selangor, Malaysia
Website: www.itmikro.com
Tel: +(603)5525 3863 Fax: +(603)5525 3873
v1.1
HAZARD CATAGORIES AND SPECIAL SYMBOL
Read all instruction carefully and check the device before installing or servicing it. The following safety alert
symbol may appear throughout this manual or on the device to warn of any potential hazards or to call for
attention.
PLEASE NOTE
The power meter should be installed, operated, serviced and maintained only by qualied personnel. No
responsibility is assumed by the manufacturer for any consequences arising out of the use of this material.
DISCLAIMER
Mikro shall not be liable for errors contained herein including any incidental and/or consequential damages
arising from the use of this material. Mikro also reserves the right to vary the product from that described in this
material without prior notice.
COPYRIGHT
The licensed software contained in the product is proprietary software owned by Mikro or its third party suppliers
and shall be used solely in connection with the product.
BEFORE YOU BEGIN
• Apply appropriate personal protective equipment and follow safe electrical work practices.
• NEVER work alone.
• Turn o all power supplying the power meter and the equipment in which it is installed before working
on it.
• Always use a properly rated voltage sensing device to conrm that all power is o.
• Before closing all covers and doors, carefully inspect the work area for tools and objects that may have
been left inside the equipment.
• NEVER bypass external fusing.
• NEVER open circuit a CT; use the shorting block to short circuit the leads of the CT before removing
the connection from the power meter.
• Before performing hi-pot testing on any equipment in which the power meter is installed, disconnect all
input and output wires to the power meter. High voltage testing may damage electronic components
contained in the power meter.
• The power meter should be installed in a suitable electrical enclosure.
Failure to follow this instruction may result in serious injury
CONTENTS
1. Introduction
1.1. Content of box
1.2. Part of power meter
2. Installation Guide
2.1. Precautions
2.2. Mounting
2.3. Wiring
3. Meter parameters
4. Display and Buttons
5. Function
6. Setting up
6.1. Access programming mode
6.2. Setup CT ratio
6.3. Setup PT ratio
6.4. Neutral current
6.5. Setup communication conguration
6.6. Demand setting
6.7. System setting
6.8. Reset all energy register
6.9. Reset demand register
6.10. Reset maximum & minimum value
6.11. Remote set
6.12. Scroll setting
6.13 Scroll delay setting
6.14 Reset Hour on register
6.15 Backlight setting
6.16 Software version
6.17 Exit from programming mode
6.18 Setup new password
7. Specications
8. Modbus Data Register *
1
1
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3
3
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4
6
6
7
9
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10
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11
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12
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18
20
9. Maintenance and Troubleshooting
10. Dimensions
11. Appendix
11.1. Demand Calculation
11.2. Data Read Format from Modbus *
11.3. Neutral Current Calculation
29
29
30
30
30
31
*- Applicable for DPM380 only
FIGURES
1. Parts of power meter
2. Recommendation cut-out
3. 3-phase 4-wire system with 4 CTs
4. 3-phase 4-wire system with 3 CTs
5. 3-phase 3-wire with 3CTs and 3VTs
6. 3-phase 3-wire with 2CTs and 3VTs
7. Menu map for the normal mode
8. Flow map for the programming mode
2
3
4
4
5
5
7
8
TABLE
1. Parts list
2. Location and part label
3. Model information
4. Specication
5. Data length nomenclature
6. Device and communication register
7. Operation data registers
8. Setting data registers
1
2
2
18
20
20
21
28
1. Introduction
Thank you for purchasing the DPM380 / DPM380B Digital Power Meter.This multifunctional power meter
measures the following parameters:
• True RMS phase voltage ( L- N )
• True RMS line voltage ( L- L)
• True RMS phase and neutral current
• Active, reactive and apparent power
• Total active, reactive and apparent energy
• Total and displacement power factor
• Frequency
• Voltage and current total harmonic distortion (THD)
• Demand and maximum demand for total active, reactive and apparent power
• Maximum and minimum phase and line voltage
• Maximum and minimum phase and neutral current
• Maximum and minimum total active, reactive and apparent power
This power meter also comes with the Modbus-RTU connectivity. (Only for DPM380 model)
1.1. CONTENT OF BOX
Upon opening this box, you should nd the following item shown in table 1:
Table 1: Parts list
No Description Quantity
1 DPM380/DPM380B power meter 1
2 Retainer clip 2
3 Quick guide 1
2
Model Information
DPM380 Auxiliary 90~415VAC or 100~300VDC; with Modbus
DPM380B Auxiliary 90~415VAC or 100~300VDC; without Modbus
Table 3: Model information
1
2
3
4
5
5
6
6
1.2. PARTS OF POWER METER
Figure 1: Parts of power meter
No Part Description
1 Current inputs Current metering connections
2 RS485 port * The RS485 port is used for communications with remote monitoring and
control system
3 Power supply input Connection to power the meter
4 Voltage inputs Voltage metering connections
5 Retainer clips Used to hold power meter in place.
6 Retainer clips slot To slot-in retainer clips in place
Table 2: Location and part label
*- Applicable for DPM380 only
3
2.2. MOUNTING
a) Provide a cut out hole on the switchgear panel according to the dimension below.
Figure 2: Recommended out-cut.
2. Installation Guide
Before installing the power meter, please check that the environment meets the following condition:
• Operating temperature -10 Celcius to +55 Celcius.
• Humidity 5% to 95%, non-condensing
• Dust free environmental away from electrical noise and radiation
2.1. PRECAUTIONS
91 ± 0.5mm
91 ± 0.5mm
b) Insert the power meter through the hole and slide in the retainer clip along the slots on left and right sides
or bottom and top sides of the power meter until the device is tightly secured on the switchgear panel. The
orientation of the retainer clips is shown in Figure 1.
The retainer clip can be removed by lifting the tab lightly at the handle end.
c) Connect the metering voltage input, current input, communication and auxiliary according to the wiring
schemes shown in Section 2.3, Figure 3 to 6 on the next page.
d) The recommended wire size is as below:
• Voltage input and auxiliary - AWG16~22
• Current input - AWG12~18
• Modbus-RTU - AWG22 or thicker, shielded twisted pair *
NOTE:
Polarity marks must be followed as shown for CTs (S1 and S2). Please make sure the
power to the current metering input is totally shunted. Under no circumstances can the CT
connection be left in open circuit. Use a CT shorting block if necessary.
*- Applicable for DPM380 only
e) When connecting the power meter, please make sure the polarity to the terminal is correctly aligned.
f) If the Modbus-RTU* is used, it can be connected up to 32 devices in a daisy chain fashion and the cable total
length should not be more than 1000m.
NOTE:
For Modbus-RTU* connection, avoid running the cable near sources of electrical noise. The
network cable shield should be grounded at only one end.
4
Figure 3: 3 Phase 4-Wire System with 4CTs connection, direct voltage input.
2.3. WIRING
19
20
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8
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Figure 4: 3-Phase 4-Wire System with 3CTs connection, direct voltage input.
19
20
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8
15
16
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18
14
13
12
NOTE:
Neutral current measurement is based on the vector sum of 3 CTs.
*- Applicable for DPM380 only
*- Applicable for DPM380 only
5
19
20
1
2
3
4
5
6
7
8
15
16
17
18
14
13
12
Figure 5 : 3-phase 3-wire with 3CTs and 3VTs connection.
Figure 6: 3-phase 3-wire with 2CTs and 3VTs connection.
19
20
1
2
3
4
5
6
7
8
15
16
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18
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12
NOTE:
I2 current measurement is based on the vector sum of 2 CTs.
*- Applicable for DPM380 only
*- Applicable for DPM380 only
6
3. Meter parameters
Before commencing operation, the meter has to be set up. To do this, the meter must be powered up by the
meter control power supply.
Under Section 6, the following parameters should be reviewed against the default value if necessary:
• CT Ratio
• PT Ratio
• Neutral current input
• Modbus-RTU setting *
• Demand setting
• System setting
• Remote Set *
• Scroll mode setting and delay time
• Backlight setting
The ow maps for the meter is under Section 5. It is guideline for the user to ip to the desire window whether in
normal mode or programming mode.
*- Applicable for DPM380 only
4. Display and Buttons
a. Setting Indicator
b. Total Indicator
c. Alarm Indicator
d. Percentage Indicator
e. Unit Indicator
f. Capacitive/Inductive Indicator
g. Digit Display
h. ‘PROG’ button
i. ‘NEXT’ button
j. ‘DOWN’ button
k. ‘UP’ button
l. Phase Indicator
m. Window Indicator
a
b
c
d
e
f
g
h
i
j
k
l
m
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