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VFD68 Variable Frequency Drives
62
Warning
When a warning occurs, the output is not shut off.
Table 43: Mode Designation Error
Operation
Panel
Indication
Er4
Description
•
Appears if a parameter setting is attempted in the External or NET operation mode with P. 77 set
to other than 2.
•
Appears if a parameter setting is attempted when the command source is not at the operation
panel.
Check Point
•
Check that operation mode is PU operation mode.
•
Check the P. 77 setting.
Corrective
Action
•
After setting the operation mode to the PU operation mode, set the parameter.
•
After setting P. 77 to 2, set the parameter.
Table 44: VFD Reset
Operation
Panel
Indication
Err.
Description
•
Executing reset using RES signal, or reset command from communication or PU
•
Displays at powering OFF.
Corrective
Action
•
Turn OFF the reset command.
Table 45: Stall Prevention (Overcurrent)
Operation
Panel
Indication
OL
Description
During
acceleration
When the output current of the VFD exceeds the stall prevention operation level
(P. 22), this function stops the increase in frequency until the overload current
decreases to prevent the VFD from resulting in overcurrent trip. When the overload
current has reduced below stall prevention operation level, this function increases
the frequency again.
During
constant-
speed
operation
When the output current of the VFD exceeds the stall prevention operation level
(P. 22), this function reduces frequency until the overload current decreases to
prevent the VFD from resulting in overcurrent trip. When the overload current has
reduced below stall prevention operation level, this function increases the frequency
up to the set value.
During
deceleration
When the output current of the VFD exceeds the stall prevention operation level
(P. 22), this function stops the decrease in frequency until the overload current
decreases to prevent the VFD from resulting in overcurrent trip. When the overload
current has decreased below stall prevention operation level, this function
decreases the frequency again.
Check Point
•
Check that the Pr. 0 setting is not too large.
•
Check that the Pr. 7 and
Pr. 8 settings are not too small.
•
Check that the load is not too heavy.
•
Check for any failures in peripheral devices.
•
Check that the value of P. 22
is appropriate.
Corrective
Action
•
Increase or decrease the Pr. 0 setting by 1% and check the motor status.
•
Set a larger value in Pr. 7 and
Pr. 8.
•
Reduce the load weight.
•
Set stall prevention operation current in P. 22
(The default value is 150%.) The acceleration/
deceleration time may change. Increase the stall prevention operation level with P. 22.