HAKO 7580.02, Сервисная книжка

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Foil 70
9.2.3 ZAPI Controller
7) VMN LOW
Test in rest state and during ride up to VMN synchronised for 80%;
Voltage at VMN terminal normally equals 50% Vbatt if contactors are open. If this voltage is
insufficient (< 30% VBatt), an alarm will be output. Possible causes:
a) Main contactor (if available) does not close or is not connected at all
b) Short-circuit between VMN and -Batt terminals (metal particle or other)
(disconnect cable at VMN terminal, switch on, fault disappears)
c) Power MOSFET short-circuited or permanently activated by the logic;
disconnect cable at VMN terminal, switch on, fault persists, replace controller
d) Bypass contactor (if available) stuck or opens too slowly