5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Restart mode after momentary power failure (Restart timer) (H13) (Exclusive to V/f control for IM)
H13 set the time until restart is performed after momentary power failure occurred. (At auto search setting, use H46
(auto search holding time 2)).
Restarting at the state when residual voltage of the motor is high, inrush current becomes greater or temporarily
becomes at regeneration state, and overcurrent alarm may occur. For security reason, in order to restart after
residual voltage is reduced to some extent, adjust H13. Even if auto-restarted, restart cannot be performed until the
holding time (H13) elapses.
Factory default: At the factory default state, setting is performed so that it is appropriate to the standard motor
(refer to Table 5.2-1 Factory default settings by inverter capacity). Basically, there is no need to
modify the default setting. However, when problems occur due to the long holding time or
decrease in flow rate of pump becomes significant, change to about half of the standard value
and make sure that alarm etc. will not occur.
Restart Mode after Momentary Power Failure (H14) (frequency lowering rate in Hz/s)
At momentary power failure restart operation, when inverter output frequency and motor rotation speed does not
synchronize, overcurrent occurs and current limiter will operate. When current limit is detected, automatically
decrease the output frequency and synchronize with the motor rotation speed. H14 sets the slope of lowering output
frequency (frequency lowering rate in Hz/s).
Output frequency lowering operation
Decrease by the selected deceleration time.
Decrease by the lowering rate that is set by H14.
Depending on the PI regulator of current limiting processing (PI constant is
fixed value within the inverter), the rate will decrease.
When frequency lowering rate is increased, regeneration operation is performed at the moment when
output frequency of the inverter and rotation speed of motor synchronize, and overvoltage trip may occur.
When frequency lowering rate is reduced, the time until output frequency of the inverter and motor rotation
speed synchronize (current limiting operation) becomes longer, and protection operation of inverter
overload may be activated.
Operation start
(gate ON)
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