Description - GE MM3 Instruction Manual

9 STARTER TYPES
9.11 WYE-DELTA CLOSED TRANSITION STARTER
This starter type is a reduced voltage starter. When the start button is pressed timing relay TR is picked up and
sealed in. The 1S coil is picked up which in turn picks up the 1M coil which seals itself in. When timing relay TR
times out the 2S coil is picked up which then drops out the 1S coil. The 2M coil now picks up and the 2S coil is
dropped out. The motor is now running in a delta configuration.
Figure 9–22: ELEMENTARY WYE-DELTA CLOSED TRANSITION MAGENTIC STARTER
To program the MM3 for wye-delta closed transition starter, set:
S1 CONFIGURATION\STARTER\STARTER TYPE: WYE DELTA CLS TRANS
S1 CONFIGURATION\STARTER\CHANGE OVER CURRENT: 1.0 to 5.0 x FLC
S1 CONFIGURATION\STARTER\CHANGE OVER TIME: 1 to 125 sec.
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 10: WYE DELTA 2S CONTACT
S3 PROCESS\PROGRAMMABLE INPUTS\INTERLOCK INPUT 9: WYE DELTA 1M CONTACT
S4 CONTROL\AUX RELAY 1 CONFIG\AUX RELAY 1 FUNCTION: WYE DELTA CLS TRANS
The CHANGE OVER CURRENT setpoint appears only if either of the Wye Delta starter types have been selected.
Before the CHANGE OVER CURRENT setpoint comes into effect on a Wye delta start, a minimum of 25% of the
CHANGE OVER TIME setpoint must have expired. After 25% of the time has expired and the average of the three
phase currents has dropped below the CHANGE OVER CURRENT value, the transition from Wye (Contactor A) to
delta (Contactor B) will occur. If this Setpoint is set to OFF, 100% of the CHANGE OVER TIME must expire before
the Wye to delta transition will occur.
The CHANGE OVER TIME setpoint appears only if the Wye Delta starter type has been selected. See the CHANGE
OVER CURRENT setpoint description above for operation.
GE Power Management
9.11 WYE-DELTA CLOSED TRANSITION STARTER
MM3 Motor Manager 3

9.11.1 DESCRIPTION

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