HAKO Scrubmaster B 115 R, Service Booklet

Page: 86 / 133

Foil 86
9 Drive Control Units
B1 The forward direction contactor is correctly driven but does not close.
- Contactor coil is defective; use ohmmeter to measure resistance
- Contact is mechanically blocked
- Nominal voltage of contactor coil higher than battery voltage
B2 The reverse direction contactor is correctly driven but does not close.
- Contactor coil is defective; use ohmmeter to measure resistance
- Contact is mechanically blocked
- Nominal voltage of contactor coil higher than battery voltage
B3 The forward or reverse direction contactor is correctly driven but does not close.
- Contactor coils are defective; use ohmmeter to measure resistance
- Contacts are mechanically blocked
- Nominal voltage of contactor coils higher than battery voltage
C1 No voltage supply to coil of the forward direction contactor. Check connector and
cable from contactor coil to positive supply and to pin A4 (NT2).
C2 No voltage supply to coil of the reverse direction contactor. Check connector and
cable from contactor coil to positive supply and to pin A11 (NT1).
C3 No voltage supply to coils of the forward and reverse direction contactor. Check
connector and cable from contactor coils to positive supply and to pins A4 (NT2)
and A11 (NT1).
If no faults are detected for the items C1, C2, C3, replace logic.
9.1 ATECH / ZAPI
– DC Motor