Delta DPM-D520I, User Manual

Page: 26 / 125

Chapter 4 Operation
4-5
4_

Secondary-side potential transformer (PT2):
Voltage for the secondary-side potential transformer, with a selectable range of 1~9999 V (factory default:
1 V). Corresponding Modbus address 0x11
4.2.4 Set up the System Parameters

Wiring (Power System): Options are one-phase two-wire (1PH2W), one-phase three-wire (1PH3W),
three-phase three-wire (3PH3W), and three-phase four-wire (3PH4W; default). Corresponding Modbus
address is 0XD.

Rotation (Phase): Options are ABC mode (default) and CBA mode. When the phase A wiring is
connected to the meters phase C and phase C wiring is connected to the meter’s phase A, you can use
CBA mode without having to reconnect the wiring. Corresponding Modbus address is 0XC.

Number CT: The number of CTs on the system; options are 0, 1, 2 and 3 (default). Corresponding
Modbus address 0X12.

Number PT: The number of PTs on the system; options are 0, 2 and 3 (default). Corresponding Modbus
address 0X12.
*Note: When the wiring is one-phase two-wire (1PH2W), the fixed number of CT and PT is 1 and 3. When the
wiring is one-phase three-wire (1PH3W), the fixed number of CT and PT is 2 and 3, which are not able to be
modified.
4.2.5 Set up the Alarms

Alarm: Whether this alarm is enabled or disabled (factory default).

Pickup Setpoint: When the threshold (default: 0) set on the meter is exceeded, an alarm is generated
triggered.

Pickup Time Delay: When the threshold set on the meter is exceed for a period longer than the pickup
time delay (default: 0), the alarm is triggered.

Dropout Setpoint: When the threshold (default: 0) set on the meter falls short, the alarm is cleared.

Dropout Time Delay: When the measurement value falls below the threshold for a period longer than
the dropout time delay (default: 0), the alarm is triggered.

The corresponding MODBUS address for alarms would be 0x1F~0xDD.