HAKO Scrubmaster B 115 R, Сервисная книжка

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Foil 75
9 Drive Control Units
8) VMN HIGH
Test in rest state;
If contactors are open, voltage at VMN connection normally amounts to 50% VBatt. If
this voltage value is exceeded (> 70% VBatt), an alarm is output. Possible causes:
a) A direction contactor is permanently closed since mechanically blocked
or permanently driven (incorrect wiring of contactor coil)
b) Short-circuit between field and armature winding of motor
(disconnect cable at connection VMN, switch on, error disappears, repair motor)
c) Incorrect connection of motor cable (check field and armature winding)
d) Power circuit of controller defective (free wheeling or braking diodes short-
circuited) (disconnect cable at connection VMN, switch on, error persists,
replace controller)
9.1 ATECH / ZAPI
– DC Motor