Toshiba P7 User manual
If the inverter trips due to a fault or malfunction, remove the cause of the trip before resetting it. If the inverter itself is the cause of the trip, it will trip again despite being reset.
To recover the inverter from trip status:
Turn off the power (until nothing appears on the LED display).
Refer to section 6.253, "Inverter trip holding parameters" F602.
Use external terminal control: short circuit between RES and CEC.
Operate on the panel.
Operate by communication (refer to the "manual for communication" for details).
Reset it using one of the following ways.
Resetting procedure by panel operations is as follows:
Check whether the LED on the control panel indicates that tripping has occurred. If the occurrence of tripping is not indicated, press the MONITOR key to display it.
Press the STOP key and make sure that (L -- message appears on the display).
Press the STOP key once more. If the cause of the trip is removed, the inverter is reset by the second pressing of the STOP key.
If the inverter trips as a result of overload protection (OL: inverter overload, OLt: motor overload, OLr: Dynamic braking resistor overload), it cannot be reset for a period of wait/until cooling time:
Standard cooling time:
In case of OL: for about 30 seconds after trip
In case of OLt: for about 120 seconds after trip
In case of OLr: for about 20 seconds after trip
If the inverter trips because of overheat (OH), reset it after a considerably long time enough for cooling it down completely, because overheat is detected based on its internal temperature.
If the Motor Does Not Run Despite No Trip Message Appearing...
If the motor does not run despite no trip message appearing on the display, proceed to troubleshooting according to the following flowchart.
Motor does not run.
Is 7-segment LED display turned on?
No:
+Check input power and MCCB.
+Is input power correct?
+No: Make a service call.
+Yes: Input power supply correctly.
Is RUN/STOP LED blinking?
Yes:
+Main circuit power is undervoltage. If input voltage or DC reactor (DCL) voltage is low, check the connection.
+For monitoring input voltage, refer to section 8.1.
Is PGOF blinking?
Yes:
+Control power is undervoltage. Check input voltage and connection of control power supply. (This is an option for the 22 kW or lower type.)
Is STF blinking?
Yes:
+Circuit between ST and CC is open. Close the circuit between the terminal assigned as ST (standby) and CC of the control terminal board. (Refer to 7.2.1)
+Change setting value of ST (standby) signal selection parameter F 103. (Refer to 6.2.1)
Is trip indication appearing?
Yes:
+Investigate the cause of failure and remove the cause before resetting the inverter. For resetting, refer to section 12.2.
Are RUN/STOP and trip indication appearing alternately?
Yes:
+The inverter is in retry operation. Retry operation discontinues if stop or emergency stop operation is done or power supply is cut off.
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