Causes and corrective actions
146
E.IPF is not activated in the delta connection (for terminals R2/L12, S2/L22, and T2/L32) even if the power fails for longer than 15 ms while the
converter unit is used with a 12-phase transformer.
E.ILF is not activated when input is lost for one of the three phases (terminals R2/L12, S2/L22, and T2/L32) while the converter unit is used with
a 12-phase transformer.
Operation panel
indication
E.IPF
Name
Instantaneous power failure
Description
If a power failure occurs for longer than 15 ms (this also applies to converter unit 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 100 ms or longer, the fault output is not provided,
and the inverter restarts if the inverter start signal is ON upon power restoration. (The inverter continues
operating if an instantaneous power failure is within 15 ms.) In some operating status (load magnitude,
acceleration/deceleration time setting, etc.), overcurrent or other protection may be activated by the inverter
upon power restoration.
When instantaneous power failure protection is activated, the IPF signal is output. (Refer to
.)
Check point
Find the cause of the instantaneous power failure occurrence.
Corrective action
• Recover from the instantaneous power failure condition.
• Prepare a backup power supply in case of an instantaneous power failure.
• Set the function of automatic restart after instantaneous power failure (
Pr.57
). (Refer to
Operation panel
indication
E.UVT
Name
Undervoltage
Description
If the power supply voltage of the converter unit decreases, the control circuit will not perform normal
functions. In addition, the motor torque will be insufficient and/or heat generation will increase. To prevent
this, if the power supply voltage decreases to about 300 VAC or below, this function shuts off the inverter
output.
When undervoltage protection is activated, the IPF signal is output. (Refer to
Check point
Check if a high-capacity motor is driven.
Corrective action
• Check the power supply system equipment such as the power supply.
• If the problem still persists after taking the above measure, contact your sales representative.
Operation panel
indication
Name
Input phase loss
Description
The inverter output is shut off if one of the three power input phases is lost when
Pr.872 Input phase loss
protection selection
= "1 (initial value)"
.
(Refer to
.)
Check point
Check for a break in the cable for the three-phase power supply input.
Corrective action
• Wire the cables properly.
• Repair a break portion in the cable.
Operation panel
indication
E.OHT
Name
External thermal relay operation
Description
While "1" (NC contact) or "2" (NO contact) is set in
Pr.876 OH input selection
to enable the function, the
inverter output is shut off if output of the device such as a thermostat is input as the OH signal, and the OH
signal turns ON (NO contact input) or turns OFF (NC contact input).
The OH signal function is assigned to terminal OH in the initial status.
This protective function is not available in the initial setting of
Pr.876
(
Pr.876
= "0"). (Refer to
.)
Check point
• Check for overheating of the thermostat for overheat protection of peripheral devices.
• Check that the value "7" (OH signal) is set correctly to any of
Pr.178, Pr.187 or Pr.189 (Input terminal
function selection)
.
Corrective action
• Reduce the load and operation duty.
• Even if the thermostat automatically returns to normal, the converter unit (inverter) will not restart unless it is
reset.
Operation panel
indication
E.PA1
Name
Parallel operation slave 1 fault
Description
Appears on the operation panel of the master at an occurrence of a slave 1 converter fault during the parallel
operation. Appears on the master converter unit even when the RS-485 terminals are incorrectly connected.
Check point
• Check that the protective function of the salve 1 is activated.
• Check the RS-485 terminal wiring.
Corrective action
• Remove the fault of the slave 1.
• Perform correct wiring of the RS-485 terminals.
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