HAKO Scrubmaster B 115 R, Сервисная книжка

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Foil 74
9 Drive Control Units
7) VMN LOW
Test in rest state and during ride until VMN is pulsed out to up to 80%;
If contactors are open, voltage at VMN connection normally amounts to 50% VBatt. If
this voltage value is insufficient (< 30% VBatt) an alarm is output. Possible causes:
a) Master contactor (if fitted) does not close or is not connected at all
b) Short-circuit between connection VMN and -Batt (metal particles or
other.) (disconnect cable at connection VMN, switch on, error disappears)
c) Power MOSFET short-circuited or permanently triggered by logic;
(disconnect cable at connection VMN, switch on, error persists, replace
controller)
d) Bypass contactor (if fitted) stuck or opens too slowly
9.1 ATECH / ZAPI
– DC Motor