Chapter 12 Description of Parameter Settings
MH300
06 Protection Parameters (1)
Y
ou can set this parameter during operation.
Default: 180.0 / 360.0
Settings 115V / 230V models: 150.0–220.0 V
DC
460V models: 300.0–440.0 V
DC
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 models) or 60 V (460V models).
Over-voltage Stall Prevention
Default: 380.0 / 760.0
Settings 0: Disabled
115V / 230V models: 0.0–390.0 V
DC
460V models: 0.0–780.0 V
DC
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.
When setting value exceeds the OV level (as shown in the table below), the OV stall function is
deemed to be disabled.
Voltage
OV Stall OV
Default Setting Range Default (Read only)
230V models 380 V
DC
0.0~390.0 V
DC
410 V
DC
460V models 760 V
DC
0.0~780.0 V
DC
820 V
DC
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