4-239
The inverter will return to normal operation when:
(1) The reference frequency is restored while running and the reference level exceeds 80% of the master
frequency command.
(2) Stop command is issued.
Notes:
- Reference frequency loss level (11-42) is corresponding to the maximum output frequency of Motor 1 (01-02).
- Reference frequency loss level is used in the analog signal (1: AI1 or 7: AI2) from the selection of main
frequency source (00-05).
Refer to the following Fig. 4.4.93 for the operation diagram of multi-function digital output (03-11~03-12) when the
analog frequency command is in the loss of frequency command.
t
100%
360ms
Analog Frequency
Command
Analog frequency
command lossing
digit output
03-11=26 or 03-12=26
t
10%
OFF
OFF
ON
Figure 4.4.93 Operation in reference frequency loss
11-43
Hold frequency at start
Range
0.0~599.0 Hz
11-44
Frequency hold time at start
Range
0.0~10.0 Sec
11-45
Hold frequency at stop
Range
0.0~599.0 Hz
11-46
Frequency hold time at stop
Range
0.0~10.0 Sec
The hold function is used to temporarily hold the reference frequency in order to prevent stalling the motor or
preventing an over current condition during starting or stopping due to load conditions.
During start the inverter will operate at the hold frequency at start for the time specified in the parameter 11-44 in
order to establish the magnetic flux.
Note:
The acceleration of deceleration time does not include the start and stop hold time. Refer to the figure
4.4.94.
