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14.3 Main microcontroller alarm analysis and solution
Home page for the handheld unit, press ENTER button to enter into the main menu
1) “CAPACITOR CHARGE” Power capacitor power
Below is the power of capacitance charging system
When closed electricity lock switch, inverter through power resistance to charge with power capacitor,
testing the capacitor is charging in preinstall time , if not, there will be a fault display, main contactor
disconnect
。
Solution
：
A) shunt load of power capacitor external ends,power capacitor will generate reverse current when in
charge ,which hinder the capacity charge.With a light bulb or a DC/DC converter or a auxiliary load
instead of power capacitor used to detect faults
。
B) Charging resistance disconnect, Insert power resistance to the main contactor power; If a fault
disappeared, that means the controller charging resistance damage
。
C) Controller internal charging circuit fault
D) Power unit of controller fault.
1
“VMN LOW” Low voltage of motor
Cause 1
：
Detection when start
before closed main contactor switch , with the software testing power bridge: alternate closed
above power MOS tube, hope to increase phase voltage to power capacitor voltage value, if phase
voltage not increase, will fault alarm
Cause 2
：
Motor running test, when the motor is running, the power bridge in closed state, testing the motor
voltage feedback; If lower than the set value that failure.Solution
：
A
）
If the problem occurred in start-up (main contactor not closed), detection
：
- Motor internal connection
- The motor power cable connection
- Electric leakage to frame
- That is the fault of the controller if motor connection correct,
B) If the fault occurred in the motor running, detection
：
-
Motor connection
whether Motor coil/ cable leakage to frame or not
-
Good contacts of the main contactor power
。
-
That is the fault of the controller if motor connection correct
