HAKO Scrubmaster B 120 R Service Booklet page 75

9. Drive
9.2 Service codes DMC control unit
Code Name
Hard Error Faults - Immediately stops pulsing and open line contactor - Cannot be reset (only by a key switch
20 Hardware over current trip
21 Contactor Coil driver fault
22 Battery Voltage is too high
23 Mosfet short circuit in neutral
24 Hardware Fail safe fault
25 Line Contactor failure
Description
recycle)
Motor Over current
Coil of Line Contactor or Magnetic Brake
short circuit
Voltage > 67V
Low side Mosfet short ciionrcuit in neutral
position
Hardware safty problem
Relais Contacts are not closed within it´s
time Specification
Remedy
Check Motor and Motor wiring
Check Line contactor (-K02) and Magnetic
Brake(-M01)
Excessive downhill ride?
Check Motor Insulation, if OK, replace drive
Control Unit
Check wiring. Replace Drive Control Unit.
Check the wiring of the line contactor (-K02)
Battery Voltage too low?
E-stop in Key switch circuit is active
Open circuit from B+ to B- (Fuse -F04)
Sheet 75