Description - GE MM3 Instruction Manual

9.10 WYE-DELTA OPEN TRANSITION STARTER
9.10 WYE-DELTA OPEN 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.
To program the MM3 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 aver-
age of the three phase currents has dropped below the CHANGE OVER CURRENT 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.
9
9-28 MM3 Motor Manager 3
9 STARTER TYPES

9.10.1 DESCRIPTION

GE Power Management