MCD 200 Series
MG.17.D3.02 – VLT is a registered Danfoss trademark
17
T
e
sts
-
Refit the Interface and Main Control PCBs.
-
Check for correct operation
•
Verify Bypass Contactor operation using the
following procedure
-
Remove the Main Control PCB and Interface
PCBs.
-
Using a 24 VDC source, momentarily apply
voltage to the Bypass Contactor control pins
as shown in the pictures below. The Bypass
Contactors are latching, so voltage needs to
be applied in both directions to fully check
operational integrity.
Bypass Control Pins : MCD 200 007, 015, 018, 022, 030
Bypass Control Pins : MCD 200 037, 045, 055
Bypass Control Pins : MCD 200 075, 090, 110
-
If the Bypass Contactor does not operate it
must be replaced.
•
Verify Main Control PCB and Interface PCB
operation using the following procedure.
-
Replace the Main Control PCB.
-
If correct operation is not restored, refit the
original Main Control PCB and replace the
Interface PCB.
-
If correct operation is not restored replace
both the Main Control PCB and the Interface
PCB.
