NO.7 Maintenance and Fault Information
78
Variable frequency low
voltage
1: Inspect network voltage; 2: Send for repair.
Inverter overheating
1: Inspect whether the fan is locked and radiating fin
is free of foreign matter;
2: Whether ambient temperature is normal;
3: Whether there is air space enough for air
convection;
4: Inspect whether the thermistor and connecting
line are in open circuit.
Inverter overloading
150%
For 1min
1: Inspect whether the capacity of inverter is too
small; if yes, increase the capacity;
2: Inspect whether mechanical load is locked;
3: Poor V/F curve setting, so reset.
Motor overloading
150%
For 1min
1: Whether mechanical load changes abruptly;
2: Too small motor adapted;
3: Heating insulation of the motor becomes poor;
4: Whether the voltage fluctuates greatly;
5: Whether open-phase exists;
6: Mechanical load increases.
Motor over torque
1: Whether mechanical load fluctuates
2: Whether motor configuration is less than normal.
External interference
Isolate interference source
Emergency stop
In emergency stop state
4-20mA line breakage
Connect up broken line
Parameter setting
error
Correctly set the parameter
DC braking mode
In DC braking mode
Code table:
A
b
C,c
d
E
F
G
H
O,o
S
n
L
T
P
r
u
2
7.4 Fault and analysis
1. Motor fails to run after operating key is pressed
(1) Operating mode is set in error, that is, the operating mode is enabled together with
external control terminal on the condition of external control terminal.
(2) Frequency instruction is low level or not given.
(3) Peripheral wiring is in error, such as wrong two-wire system and three-wire system wiring
and relevant parameters setting.
(4) Setting of multi-function input terminal is in error (on the condition of external control).
