4-155
When the AC input voltage is lower than the value set in 07-13 divided by 1.414 (AC voltage detection level) for
the time specified in 07-25 a low-voltage error "UV" will be displayed. If 07-25 = 0.00 sec., the UV error will be
displayed immediately.
Important Notes:
1. The inverter input voltage can limit the output voltage. The connected motor may stall if the input voltage drops
excessively or if the load is too big.
2. If the input voltage drops below the value set in 07-13 then the inverter output is turned off momentarily. The
inverter will
not
automatically start when power is restored.
07-18
Minimum base block time
Range
【
0.1~5.0
】
Sec
During a momentary power failure, the inverter continues to operate after power has been restored when
parameter 07-00 is set to 1.
When a momentary power failure is detected; the inverter will automatically shut off the output and stay in base
block mode (B.B.) for the time set in (07-18).
The inverter will automatically perform a speed search when power is restored and power outage time exceeded
the minimum base block time (07-18); refer to the following figure 4.3.63 for additional information.
Figure 4.3.63 Minimum base block time and momentary power loss time
Notes:
Minimum base block time (07-18) is also used by the DC injection braking function
Set the minimum base block time as required (07-18).
Increase minimum Baseblock time if over-current "OC" condition occurs.
After speed search has ended the inverter returns to normal operation.
t
t
t
t
t
t
Momentary
power loss
Minimum B.B.
Time (07-18)
Inverter B.B.
time
(b) Minimum baseblock time (07-18) is
shorter than momentary power loss time
Momentary
power loss
Minimum B.B.
Time (07-18)
Inverter B.B.
time
(a) Minimum baseblock time (07-18) greater
than momentary power loss time