AuCom EMX3-1600C - Page 71

APPLICATION EXAMPLES
Commissioning
1. Configure the EMX3 as follows:
Parameter settings:
• Parameter 7D Relay B Function
• Select 'Changeover contactor'
• Parameter 7E Relay B On Delay
• Set this to the maximum time (5m:00s).
• Parameter 12A Motor Data-1 Ramp
• Select 'Dual Ramp' (for slip-ring induction motor control)
• Parameter 12C Changeover Time
• Default setting is 150 milliseconds. Set this to a value just greater than the changeover contactor (K1) 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 7E 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 (K1) switches in to short-out the rotor resistance (R1).
If the motor does not 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.
Speed
3
Time
1
R1 Constant Speed
5
Parameter 7E Relay B On Delay
2
First ramp
6
K1 closes
3
Second ramp
7
Parameter 12C Changeover Time
4
Run mode (I < 120% FLC)
NOTE
For this installation to function correctly, only use the primary motor settings with constant current start method
(parameter 2A
Start Mode ).
70 | User Manual (710-04840-00M)