
TROUBLE SHOOTING
7-19
17.
“ErF” Data save error during under voltage
Problem The inverter was unable to save data such as the frequency commands, timer, and PID
process commands set through the keypad when the power was switched off.
Possible Causes
What to Check and Suggested Measures
1.
The control circuit
voltage dropped
suddenly while the
data was being saved
when the power was
turned off, because the
electric charge in the
DC bus capacitor was
rapidly discharged.
Check how long it takes for the DC link circuit voltage to drop to the
preset voltage when the power is turned off.
→
Remove whatever is causing the rapid discharge of the electric
charge. After pressing the PRG/RESET key and releasing the
alarm, reset the data (such as the frequency commands, timer, and
PID process commands) set with the keypad to the correct
settings and then restart the motor.
2.
A high intensity noise
was given to the
inverter while data
was being written
when the power was
turned off.
Check if appropriate noise control measures have been implemented
(e.g. correct grounding and routing of control and main circuit wires).
→
Improve noise control. Press the PRG/RESET key to release the
alarm, then reset the data (e.g. frequency commands, timer, and
PID process commands) set through the keypad to the correct
settings. Restart the motor.
3.
The CPU did not
operate normally.
Check if ErF occurs each time the power is switched off.
→
This problem was caused by a printed circuit board (PCB)
(including the CPU) malfunction, so it is necessary to replace the
PCB.
Содержание MWHE20
Страница 1: ......
Страница 12: ...SPECIFICATION COMPONENT IDENTIFICATION 2 3 C B ...