Delta MM300 Instruction Manual Page 31

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2–12 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
2.2.2.2 Thermistor connections
Either a positive temperature coefficient (PTC) or negative temperature coefficient (NTC)
thermistor may be directly connected to the + and - terminals on the CPU module. By
specifying the hot and cold thermistor resistance, the MM300 automatically determines
the thermistor type as NTC or PTC. Use thermistors with hot and cold resistance values in
the range 100 to 30000 ohms. If no thermistor is connected, the
Thermistor Alarm and
Thermistor Trip settings must be set to “Disabled”.
Figure 14: Typical thermistor connection
2.2.2.3 RS485 connections
Figure 15: Typical RS485 connection
+
C–+
CPU module
MM300
Motor Management System
To switchgear
ground bus
853743A1.CDR
R
ISG
RS485 Thermistor CBCT
Control power
LN
+
Stator thermistor
MOTOR
SG = Surge Ground = Functional Ground
SCADA, PLC, OR
PERSONAL COMPUTER
COM
OPTOCOUPLER
DATA
MM300 IED
SHIELD
853745A1.CDR
UP TO 32 MM300
OR OTHER IEDs,
MAXIMUM CABLE
LENGTH OF
1200 m (4000 ft.)
LAST
DEVICE
(*) TERMINATING IMPEDANCE AT EACH END
(typically 120 ohms and 1 nF)
TWISTED PAIR
Z
T
(*)
RS485 +
RS485 -
COMMON
RS485 +
RS485 -
COMMON
IED
RS485 +
IED
RS485 -
COMMON
GROUND THE SHIELD AT THE
SCADA/PLC/COMPUTER ONLY
OR THE MM300 ONLY
DATA
OPTOCOUPLER
B1
B2
B3
Z
T
(*)
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