Toshiba VF-nC1 User Manual download pdf (Page 80)

E6581090

F-16

Here are typical causes of tripping and the corresponding retry processes.

Cause of

tripping

Retry process Canceling conditions

Momentary

power failure

Overcurrent

Overvoltage

Overload

Up to 10 times of retry in succession

1st retry: About 1 sec. after tripping

2nd retry: About 2 sec. after tripping

3rd retry: About 2 sec. after tripping

　　　　　　　 ⋅

10th retry: About 10 sec. after tripping

The retry function will be cancelled

at once if:

• Tripping occurs for any reason

other than momentary power

failure, overcurrent, overvoltage

or overload.

• The motor does not restart within

the specified number of times.

★The retry function is not activated if tripping is caused by one of the following:

・QEC : Arm overcurrent at start-up

・QEN : Overcurrent on the load side at start-up

・GRJQ : Output open-phase failure

・G : External tripping stop

・WR : Undervoltage stop

・GH : Ground fault trip

・GRJK : Input open-phase failure

・GTT : Main body RAM fault

・GTT : Main body ROM fault

・GTT : CPU fault

・GTT : Remote control error

・GTT : Driver fault

・GGR : EEPROM fault

★Protective operation detection relay signals (FLA, FLB and FLC terminals) are not sent during the

retry process.

★A virtual cooling time is provided for overload tripping (QN, QN), so that the retry process is

started after the virtual cooling time and retry time.

★In the case of overvoltage tripping (QR~QR), tripping may recur unless the DC voltage falls

below a predetermined level.

★In the case of overheating tripping (QJ), tripping may recur unless the internal temperature of the

inverter falls below a predetermined level, since the internal temperature is monitored.

★Even if trip retention selection parameter (H) is set to 1, the retry function is enabled if the

number of times of retry is set with H.

★During the retry process, the message “TVT[” and the item specified with the status monitor

selection parameter H are displayed alternately.

6.10.4 Avoiding overvoltage tripping

H

: Over voltage limit operation

• Function

This parameter is used to keep the output frequency constant or increase the frequency to

prevent overvoltage tripping due to an increase in DC voltage during deceleration or constant-

speed operation. The deceleration time may be prolonged during overvoltage limit operation.

Overvoltage limiting level

DC voltage

Output

frequency

Overvoltage limiting level

[Parameter setting]

Title FunctionAdjustment rangeDefault setting

H

Over voltage limit

operation

0: Enabled, 1: Disabled,

2: Enabled (forced quick

deceleration)

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Toshiba VF-nC1 User Manual Page 80

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