CHAPTER 4: SETPOINTS CONFIGURATION SETPOINTS
MM200 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 4–7
Current transformers
The following setpoints are available to configure the current and voltage transformers.
Phase CT Type (Mandatory setpoint)
Range: None, 1 A Secondary, 5 A Secondary, Direct Connect
Default: Direct Connect
This setpoint specifies the phase CT connection type. The “Direct Connect” value
indicates that no phase CTs are used; instead, motor phase current passes directly
through the relay. The “Direct Connect” selection should never be used where full load
current is greater than 5.0 amps.
NOTE:
If Direct Connect is selected and the FLA is set >5 A, a "FLA too high" message will be
displayed on the Status page.
CT Primary Turns
Range: 1 to 10
Default: 1
For smaller motors where the drawn current is very low, the motor leads may be
wrapped through the CT Primary with several turns thereby increasing the current seen
by the MM200 and as a result increasing the accuracy of the measurement. The value of
this setting should equal the number of turns on the CT Primary to display the correct
current value. Internally the current measurement will be divided by this setting.
CT Primary (Mandatory setpoint)
Range: 5 to 1000 amps in steps of 1
Default: 5 amps
This setpoint specifies the phase CT primary current. It should never be less than the full
load current, and preferably no greater than twice than the full load current.
NOTE:
This setpoint is displayed only if the phase CT is selected to 1 A secondary or 5 A
secondary.
High Speed CT Primary
Range: 5 to 1000 amps in steps of 1
Default: 5 amps
This setpoint specifies the phase CT primary current when the motor is running at high
speed. It should never be less than the high speed full load current, and preferably no
greater than twice than the high speed full load current.
NOTE:
This setpoint is displayed only if the phase CT is selected as 1 A secondary or 5 A
secondary and the motor starter type is two-speed.
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