Learning Protection Features
Low Voltage Fault
When the internal DC link voltage drops due to a power loss, the inverter turns off the
output and a low voltage fault (Lut) occurs after the delay time set in Pr.81 (Low voltage
fault delay time). When the voltage recovers, the fault clears and the inverter is ready to
resume operation. Either Relay1 or Relay2 (OU.31 or OU.33) can be set to 11 (Low Voltage) to
provide an output signal.
Low voltage trip
decision delay time
Multi-function (digital)
relay 1 item
Multi-function (digital)
relay 2 item
Low Voltage Fault Setting Details
When a low voltage condition occurs, the inverter blocks it output. A
relay, if set to 11 (Low Voltage) will change state immediately. Then,
after the delay time, the inverter generates a low voltage fault (Lut). The
LVT Delay time does not apply to the relay outputs.
Output Block by Multi-function (digital) Terminal
Set one of the digital input terminals (P1 ~ P5) to 5 (BX). When activated (bx on display),
the inverter response is determined by Pr.45 (Bx Trip Mode). Set to (0) coast to a stop, Set
to (1) decelerate to a stop.
Px terminal setting
options
Output Block by Multi-function (digital) Terminal Setting Details
When a digital input terminal is set to 5 (BX) and is activated during
operation, the inverter response is determined by Pr.45 (Bx Trip
Mode). 0: Coast → The motor coasts to a stop
1: Decelerate → The motor decelerates to a stop.
While ‘bx’ is displayed, the inverter’s operating information (frequency
and current) at the time of BX signal can be monitored. The inverter
resumes operation when the BX terminal is de-activated provided that
the Start/Run command is still active.
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