Mitsubishi FREQROL-E700, Manual

Page: 96 / 108

App.2-2
Function name Description Corrective action Display
Warning
Stall
prevention
(overcurrent)
The overcurrent stall
prevention has been
activated.
• Increase or decrease the Pr. 0 Torque boost setting by
1% and check the motor status.
• Set the acceleration/deceleration time longer.
• Reduce the load. Try Advanced magnetic flux vector
control or General-purpose magnetic flux vector
control.
• Check the peripheral devices for faults.
• Adjust the Pr. 13 Starting frequency setting. Change
the Pr. 14 Load pattern selection setting.
• Set the stall prevention operation current in Pr. 22
Stall prevention operation level. (The acceleration/
deceleration time may change.) Increase the stall
prevention operation level with Pr. 22 Stall prevention
operation level, or disable stall prevention with Pr.
156 Stall prevention operation selection. (Operation
at OL occurrence can be selected using Pr. 156 Stall
prevention operation selection.)
Stall
prevention
(overvoltage)
The overvoltage stall
prevention function has
been activated.
(This warning is also output
during the regeneration
avoidance operation.)
Set the deceleration time longer.
Regenerative
brake
prealarm*
2
The regenerative brake
duty has reached 85%
of the Pr. 70 Special
regenerative brake duty
setting or higher.
• Set the deceleration time longer.
• Check the Pr.30 Regenerative function selection and
Pr. 70 Special regenerative brake duty settings.
Electronic
thermal relay
function
prealarm*
1
The cumulative value of the
electronic thermal O/L relay
has reached 85% of the Pr.
9 Electronic thermal O/L
relay setting or higher.
• Reduce the load and frequency of operation.
• Set an appropriate value in Pr. 9 Electronic thermal O/
L relay.
PU stop
on the operation panel
has been pressed during
the External operation.
Turn the start signal OFF and release with .
Maintenance
signal output*
2
The cumulative
energization time has
exceeded the maintenance
output timer set value.
Setting "0" in Pr. 503 Maintenance timer erases the
signal.
Undervoltage The voltage at the main
circuit power has been
lowered.
Investigate the devices on the power supply line such as
the power supply itself.
Minor
failure
Fan alarm The cooling fan is at a
standstill although it is
required to be operated.
The cooling fan speed has
decelerated.
Check for fan failure. Please contact your sales
representative.