MCD 200 Series
MG.17.D3.02 – VLT is a registered Danfoss trademark
19
T
e
sts
•
Verify plug connections between the Main
Control PCB and Interface PCB by
- Removing and refitting the Main Control PCB
- Check for correct operation.
•
If correct operation is not restored
- Replace the Main Control PCB
- Check for correct operation.
•
If correct operation is not restored
- Refit the original Main Control PCB.
- Replace the Interface PCB.
- Check for correct operation.
•
If correct operation is still not restored
- Replace both the Main Control PCB and the
Interface PCB.
Control Input Test
This procedure tests the condition of the soft starter
control inputs. This test is performed using a voltage
meter.
•
Remove any external wiring from the soft starter
control inputs (N1, N2).
•
Control voltage must still be connected to the soft
starter (A1 to A2 or A2 to A3).
•
Measure the voltage from terminal A1 to each
control input terminal (A1 to N1 and A1 to N2).
Action:
1. If no voltage is present, the control input is
damaged. The Main Control PCB must be
replaced.
Damage to control inputs is most commonly caused
by application of incorrect control voltage by the user.
Application of incorrect control voltage is evidenced by
damage to the MOV located on the Main Control PCB.
MOV Location : Control PCB
