276
Causes and corrective actions
Operation Panel
Indication
E.THM
FR-PU04
FR-PU07
Motor Ovrload
Name
Motor overload trip (electronic thermal relay function)
*1
Description
The electronic thermal relay function in the inverter detects motor overheat due to overload or reduced
cooling capability during constant-speed operation and pre-alarm (TH display) is output when the
integrated value reaches 85% of the
Pr. 9 Electronic thermal O/L relay
setting and the protection circuit is
activated to stop the inverter output when the integrated value reaches the specified value. When
running a special motor such as a multi-pole motor or multiple motors, provide a thermal relay on the
inverter output side since such motor(s) cannot be protected by the electronic thermal relay function.
Check point
1. Check the motor for use under overload.
2. Check that the setting of
Pr. 71 Applied motor
for motor selection is correct.
(Refer to
page 99.)
3. Check that stall prevention operation setting is correct.
Corrective action
1. Reduce the load weight.
2. For a constant-torque motor, set the constant-torque motor in
Pr. 71 Applied motor
.
3. Check that stall prevention operation setting is correct.
(Refer to
page 70.)
*1
Resetting the inverter initializes the internal thermal integrated data of the electronic thermal relay function.
Operation Panel
Indication
E.FIN
FR-PU04
FR-PU07
H/Sink O/Temp
Name
Fin overheat
Description
If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink
overheat protection operation temperature.
For the terminal used for the FIN signal output, assign the function by setting "26" (positive logic) or
"126" (negative logic) in any of
Pr. 190 to Pr. 196 (output terminal function selection)
.
(Refer to
page 116)
Check point
1. Check for too high surrounding air temperature.
2. Check for heatsink clogging.
3. Check that the cooling fan is stopped. (Check that
is displayed on the operation panel.)
Corrective action
1. Set the surrounding air temperature to within the specifications.
2. Clean the heatsink.
3. Replace the cooling fan.
Operation Panel
Indication
E.IPF
FR-PU04
FR-PU07
Inst. Pwr. Loss
Name
Instantaneous power failure
Description
If a power failure occurs for longer than 15ms (this also applies to inverter input shut-off), the instantaneous
power failure protective function is activated to trip the inverter in order to prevent the control circuit from
malfunctioning. If a power failure persists for longer than 100ms, the fault output is not provided, and the
inverter restarts if the start signal is on upon power restoration. (The inverter continues operating if an
instantaneous power failure is within 15ms.) In some operating status (load magnitude, acceleration/
deceleration time setting, etc.), overcurrent or other protection may be activated upon power restoration.
When instantaneous power failure protection is activated, the IPF signal is output.
(Refer to
page 136)
Check point
Find the cause of instantaneous power failure occurrence.
Corrective action
· Remedy the instantaneous power failure.
· Prepare a backup power supply for instantaneous power failure.
· Set the function of automatic restart after instantaneous power failure (
Pr. 57
).
(Refer to
page
136.)
Operation Panel
Indication
E.BE
FR-PU04
FR-PU07
Br. Cct. Fault
Name
Brake transistor alarm detection/internal circuit fault
Description
This function stops the inverter output if a fault occurs in the brake circuit, e.g. damaged brake
transistors when using functions of the 01800 or more.
In this case, the inverter must be powered off immediately.
For the 01160 or less, it appears when an internal circuit error occurred.
Check point
· Reduce the load inertia.
· Check that the frequency of using the brake is proper.
· Check that the brake resistor selected is correct.
Corrective action
For the 01800 or more, when the protective function is activated even if the above measures are taken,
replace the brake unit with a new one.
For the 01160 or less, replace the inverter.
Summary of Contents for F700
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