Stiga e-PARK 220 Workshop Manual page 76

WORKSHOP MANUAL
e-PARK 220
Code Definitions
PUMP VMN
28
LOW
PUMP VMN
29
HIGH
30 VMN LOW
31 VMN HIGH
9 - ELECTRONIC MANAGEMENT - BATTERY
Probable Cause and Consequent Action
• Cause: The output of the pump motor is lower than expected, considering the pwm
value applied.
• Solution:
A) If a power-on problem occurs (KZTP does not close properly), check:
- internal motor connections (ohmic continuity);
- motor electrical cable connections;
- If the motor connection is OK, the problem is inside the controller.
B) If the problem occurs when you close the KZTP system (KZTP closes and reopens),
check:
- motor connections
- if the motor windings/cables leak to the machine chassis;
- if no motor problems are found, the problem is inside the controller.
C) If the alarm occurs during motor operation, check:
- motor connections
- If the motor windings/cables leak to the machine chassis;
- that the electrical contact of the KZTP system is correctly closed, with a good contact;
- if no motor problems are found, the problem is inside the controller.
• Cause: This test is performed when the pump motor is running (wpm applied). The
output of the pump motor is higher than expected, considering the wpm value applied.
• Solution: It is advisable to check:
- motor connections
- If the motor windings/cables leak to the machine chassis;
- if no motor problems are found, the problem is inside the controller.
• Cause 1: startup test. Before turning on the KZTP system, the software checks the
energy bridge: it alternately turns on the Mosfet transistors at the top and waits for the
phase voltage to increase towards the capacitor line value. If the phase voltage does
not increase, the alarm appears.
• Cause 2: motor operation test When the motor is running and the power bridge is
active, the test verifies the motor voltage feedback; if it is lower than the value ordered,
the fault status appears.
• Solution:
A) If a power-on problem occurs (KZTP does not close properly), check:
- internal motor connections (ohmic continuity);
- motor electrical cable connections;
- leaks between the motor and the machine chassis
- if the motor connections are OK, the problem is inside the controller.
B) If the alarm occurs during motor operation, check:
- motor connections
- If the motor windings/phase cables leak to the machine frame;
- that the electrical contact of the KZTP system is correctly closed, with a good contact;
- if no motor problems are found, the problem is inside the controller.
• Cause 1: Before turning on the KZTP system, the software checks the power bridge:
it turns on the Mosfet transistors alternately at the bottom and waits for the phase volt-
age to drop to -BATT. If the phase voltage does not decrease, the alarm appears.
• Cause 2: This alarm may appear even after the ignition diagnosis has been passed
and therefore with the KZTP system closed. In this case, the phase voltages should be
less than 1/2 Vbatt. If the value is higher, the fault status appears.
• Solution:
A) If a power-on problem occurs (KZTP does not close properly), check:
- internal motor connections (ohmic continuity);
- motor electrical cable connections;
- if the motor connection is OK, the problem is inside the controller
B) If the problem occurs when you close the KZTP system (KZTP closes and reopens),
check:
- motor connections
- If the motor windings/phase cables leak to the machine frame;
- if no motor problems are found, the problem is inside the controller.
CHAPTER EDITION PAGE
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