OPERATION
Page 48
MVS User Manual
710-13019-00A
Default setting is 150 milliseconds. Set this to a value just greater than the changeover contactor (KM3)
pole closing time.
Parameter 12D
Slip Ring Retard
Default setting is 50%. Set this parameter to a value which is high enough to cause the motor to instantly
accelerate once the rotor resistance (R1) has been bridged out and low enough to avoid a motor current
pulse.
2.
Start the motor under normal load conditions and record the time it takes to reach a constant speed with external
rotor resistance (R1) in the circuit. Stop the motor soon after a constant speed has been reached. Change parameter
7B to the recorded time value.
3.
Start the motor under normal load conditions and monitor the motor speed behaviour and motor current when the
changeover contactor (KM3) switches in to short-out the rotor resistance (R1)
If the motor does not start to accelerate immediately after changeover, increase the setting of parameter 12D.
If there is a pulse in motor current immediately after changeover, reduce the setting of parameter 12D.
Spee
d
Time
1 R1 Constant Speed
2 First ramp
3 Second ramp
4 Run mode (I < 120% FLC)
5 Parameter 7B
6 KM3 closes
7 Parameter 12C
NOTE
For this installation to function correctly, only use the primary motor settings. Only use the constant
current start method (parameter 2A
Start Mode
).
3
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