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Rs485 Connections - GE MM300 Instruction Manual

Motor management system low voltage motor protection and control
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CHAPTER 2: INSTALLATION

RS485 connections

MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Figure 2-15: Typical thermistor connection
MOTOR
Stator thermistor
To switchgear
ground bus
Control power
Figure 2-16: Typical RS485 connection
Z T (*)
OPTOCOUPLER
DATA
COM
SCADA, PLC, OR
PERSONAL COMPUTER
GROUND THE SHIELD AT THE
SCADA/PLC/COMPUTER ONLY
OR THE MM300 ONLY
(*) TERMINATING IMPEDANCE AT EACH END
(typically 120 ohms and 1 nF)
One two-wire RS485 port is provided. Up to 32 MM300 IEDs can be daisy-chained together
on a communication channel without exceeding the driver capability. For larger systems,
additional serial channels must be added. Commercially available repeaters can also be
used to add more than 32 relays on a single channel. Suitable cable should have a
+
N
L
+
C
+
RS485
Thermistor
CPU module
SG = Surge Ground = Functional Ground
MM300
Motor Management System
TWISTED PAIR
SHIELD
UP TO 32 MM300
OR OTHER IEDs,
MAXIMUM CABLE
LENGTH OF
Z T (*)
1200 m (4000 ft.)
ELECTRICAL INSTALLATION
R
I
SG
CBCT
853743A1.CDR
MM300 IED
B1
RS485 +
OPTOCOUPLER
B2
RS485 -
B3
COMMON
IED
RS485 +
RS485 -
COMMON
IED
RS485 +
RS485 -
LAST
COMMON
DEVICE
853745A1.CDR
DATA
2–13

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