4-2 Function Mode *3. If the momentary power interruption non-stop deceleration starting width (b054) is too large, an overcurrent trip occurs because of rapid deceleration. If b054 is too small, or if the momentary power interruption non-stop deceleration time (b053) is too long, an undervoltage trip occurs because of insufficient regeneration power. Main circuit P-N voltage VPN (V) b052 b051 Undervoltage level 4 Time (s) Output frequency (Hz) Functions b054 b053 Time (s) „ Momentary Power Interruption Non-stop DC Voltage Constant Control (b050 = 02: without recovery, b050 = 03:
with recovery) •If a momentary power interruption or main circuit DC voltage drop occurs during operation, the Inverter decelerates while keeping the main circuit DC voltage at the value set in momentary power interruption non-stop target voltage (OV-LADSTOP level) b052. •This function is started when the following conditions are all satisfied: • b050 = "02" or "03" • The Inverter is running.
(This function is disabled during trip/undervoltage/stop.) • The control power supply is momentarily interrupted, or the main circuit DC voltage falls below the momentary power interruption non-stop function starting voltage (b051) •This function is enabled when the above starting conditions are satisfied, even if the J51 connector cable is disconnected from terminals Ro and To and is connected from main terminal P to Ro and from N and To, or even if the control power supply is separated from the main circuit power supply. •If the time of momentary power interruption is short, the Inverter can continue to run without shutting off the output.
However, if undervoltage occurs because of momentary power interruption, the Inverter immediately shuts off the output, and stops operating this function. The subsequent power recovery depends on the setting of retry selection b001. 4-61