GE MULTILIN 269 MOTOR MANAGEMENT RELAY Series User Manual

2 INSTALLATION
2-24
secondary. Correct polarity as indicated in the wiring
Figure 2.17 through Figure 2.21 is essential for
correct measurement of all power quantities.
CTs should be selected to be capable of supplying
the required current to the total secondary load which
includes the MPM relay burden of 0.2 VA at rated
secondary current and the connection wiring burden.
Serial Communications Port (COM1 - 46,47,48)
The MPM will communicate with 269 via COM1. The
connection must be made as shown below. The MPM
must be connected to only one 269 relay at any given
time for successful communication.
MPM
46 47 48
COM - +
RS485 COM1
269
85 84
+ -
Meter
Figure 2.15 MPM and 269 Communication Wiring
The 269 communicates the following information to
the meter module: 1) 269/meter Protocol Revision; 2)
Reset MWH; 3) CT Primary; 4) VT Ratio; 5) Analog
Output Scale Factor; and 6) Checksum.
The meter, in turn, sends back the following
information to the 269:
1) Echo Protocol Revision
2) Vab, Vbc, Vca or Van, Vbn, Vcn (depending on
whether the VTs are connected phase to phase or
phase to neutral)
3) Average Voltage
4) kW
5) kvar
6) Frequency
7) Voltage Phase Reversal Status
8) VT Wiring Configuration (open delta or 2 input
wye)
9) kW sign
10) kvar sign
11) Meter Revision
12) Power Factor
13) Power Factor sign indication
+: Lead
–: Lag
14) MWh
15) Checksum
This exchange of information takes place once every
0.5 second.
MPM Analog Output
The Analog Out Scale Factor setpoint is entered to
set the Full Scale value for the MPM analog outputs
(KWATTS and KVARS). The value entered here is
the multiplier that is multiplied by 100 kW to
determine the meter’s analog output Full Scale for
KWATTS, or by 30 KVAR to determine the meter’s
analog output Full Scale for KVAR. 4 mA represents
0 KWATTS and 0 KVARS and 20 mA represents full
scale. Average RMS current is produced in analog
form where the MPM 4-20 mA is equivalent to 0 A to
1×CT rating. Power factor is produced in analog form
where 4/12/20 mA represents -0/1/+0 power factor
value respectively.

GE MULTILIN 269 MOTOR MANAGEMENT RELAY Series Specifications

General

Brand	GE
Model	MULTILIN 269 MOTOR MANAGEMENT RELAY Series
Category	Relays
Language	English