Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 88)

3-55 Functions
Publication 825-UM001B-EN-P January 2001
Star-Delta (Wye-Delta) Starting
The Smart Motor Manager issues the command to switch from star to delta (wye to delta) as
soon as the starting current has dropped to the rated value and thus the motor has reached its
normal speed in star (wye). If starting has not been completed within the normal time for this
application [max. star (wye) operation], a change to delta will be made, regardless of the speed
attained.
The permissible time for star (wye) operation can be switched on or off as desired. If it is off,
the change to delta is made solely with reference to the motor current.
If the motor has to be switched off when the normal starting time in star (wye) is exceeded,
the “monitoring starting time” function must also be activated (refer to page
3-34 ).
Figure 3.32 Diagram of Star-Delta (Wye-Delta) Starting
Table 3.AC Star-Delta (Wye-Delta) Starting Setting Parameters
Setting Star (Wye) Relay Delta Relay
Max. Star (Wye)
Operation
Function
Factory setting — Off Off
Setting
Setting range — — 1…240 s
Factory setting Relay #4 Relay #5 10 s
Setting steps — — 1 s
Ι
e
80 ms
t
80 ms
I e
I 
Motor on
off
Motor current
Star operation,
relay #4
Delta operation,
relay #5
Changeover delay