Chapter 12 Description of Parameter SettingsME300
12.1-06-1
06 Protection Parameters (1) You can set this parameter during operation.
Low Voltage Level
Default:
Settings 115V / 230V: 150.0–220.0 V
DC
180.0
460V: 300.0–440.0 V
DC
360.0
Sets the Low Voltage (LV) level. When the DC BUS voltage is lower than Pr.06-00, the drive
stops output and the motor free runs to a stop.
If the LV fault is triggered during operation, the drive stops output and the motor free runs to a
stop. There are three LV faults, LvA (LV during acceleration), Lvd (LV during deceleration), and
Lvn (LV in constant speed) that are triggered according to the status of acceleration or
deceleration. You must press RESET to clear the LV fault. The drive automatically restarts if you
set to restart after momentary power loss (refer to Pr.07-06 Restart after Momentary Power Loss
and Pr.07-07 Allowed Power Loss Duration for details).
If the LV fault is triggered when the drive is in STOP status, the drive displays LvS (LV during
stop), which is not recorded, and the drive restarts automatically when the input voltage is higher
than the LV level of 30 V (230V series) or 60 V (460V series).
Over-voltage Stall Prevention
Settings 0: Disabled Default:
115V / 230V: 0.0–450.0 V
DC
380.0
460V: 0.0–900.0 V
DC
760.0
Setting Pr.06-01 to 0.0 disables the over-voltage stall prevention function (connected with
braking unit or braking resistor). Use this setting when braking units or resistors are connected to
the drive.
Setting Pr.06-01 to a value > 0 enables the over-voltage stall prevention. This setting refers to the
power supply system and loading. If the setting is too low, then over-voltage stall prevention is
easily activated, which may increase deceleration time.
Related parameters:
Pr.01-13, Pr.01-15, Pr.01-17, Pr.01-19 Deceleration Time 1–4, Pr.02-13 Multi-function Output 1
(Relay 1), Pr.02-16 Multi-function Output 2 (MO1), and Pr.06-02 Selection for Over-voltage Stall
Prevention.
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