GE Power Management
MM2 Motor Manager 2 9-29
9 STARTER TYPES 9.10 WYE-DELTA OPEN TRANSITION STARTER
9
9.10 WYE-DELTA OPEN TRANSITION STARTER 9.10.1 DESCRIPTION
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.
To program the MM2 for wye-delta open transition starter, set:
S1 CONFIGURATION\STARTER\STARTER TYPE: WYE DELTA OPN 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 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 when STARTER TYPE is selected as WYE DELTA OPN TRANS
or WYE DELTA CLS TRANS. 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 CUR-
RENT setpoint, 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 STARTER TYPE is selected as WYE DELTA OPN TRANS or
WYE DELTA CLS TRANS. See CHANGE OVER CURRENT setpoint description above for operation.
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