Thermistor Input; Analog Input; Aux 2 Coil; Output Relays - GE MOTOR MANAGER 2 Instruction Manual

2.2 INPUTS AND OUTPUTS
Either a Positive Temperature Coefficient (PTC) or Negative Temperature Coefficient (NTC) ther-
mistor may be directly connected to the MM2. By specifying the hot and cold thermistor resistance,
the MM2 automatically determines the thermistor type as NTC or PTC. Use thermistors with hot and
cold resistance values in the range 100 to 30000 Ω. If no thermistor is connected, the thermistor
alarm and trip detection must be set to DISABLE in the S1: CONFIGURATION \ THERMISTOR page.
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The analog input accepts an input from a standard 4 to 20 mA source. This input can be used for
process control monitoring to provide status and/or alarm and tripping signals related to the level of
the input signal. The analog input messages (S3: PROCESS \ ANALOG INPUT) can be programmed to
show a user defined name and units.
The AUX Relay 2 can be internally energized by the MM2 or externally energized by applying a 24
V DC signal to these terminals. Correct polarity is required (Terminal 21 = +24 V DC, Terminal 22 = 0
V DC).
There are up to 4 output relays on the MM2. Contact switching rating for the output relays as well can
be found in Section 1.3: SPECIFICATIONS on page 1–4.
• Contactor A Relay (34/35): non-reversing, forward, low speed, etc.
• Contactor B Relay (32/33): reversing, high speed, etc.
• AUX Relay 1 (26/27/28, 29/30/31): field programmable
• AUX Relay 2 (23/24/25): field programmable or hard-wired 24 V DC coil
SWITCH INPUT COMMON TERMINALS 57 AND 58 ARE LIVE 120 V AC.
CAUTION
All switch inputs are opto-isolated and operate at a voltage of 120 V AC. The switch will read closed
when 120 VAC is applied to the switch terminal. This 120 V AC can be supplied from the switch com-
mon terminals (57, 58) or from an external source providing that the source is in phase with the sup-
ply voltage of the MM2.
These 10 inputs can be programmed to one of a number of different functions. Some of the available
functions are: Setpoint Access, Lockout Reset, Plant Interlock, Auto Start, Remote Permissive, and
Test. See the S3: PROCESS \ PROGRAMMABLE INPUTS page for complete list of available functions.
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2.2.11 PROGRAMMABLE SWITCH INPUTS

MM2 Motor Manager 2
2 INSTALLATION

2.2.6 THERMISTOR INPUT

2.2.7 ANALOG INPUT

2.2.8 AUX 2 COIL

2.2.9 OUTPUT RELAYS

2.2.10 SWITCH INPUTS

GE Power Management