Chapter 12 Descriptions of Parameter SettingsMS300
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06 Protection Parameters (1)
You can set this parameter during operation.
Default: 180.0 / 360.0 / 450.0
115V / 230V models: 150.0–220.0 V
DC
460V models: 300.0–440.0 V
DC
575V models: 375.0–550.0 V
DC
Sets the Low Voltage (LV) level. When the DC bus voltage is lower than Pr.06-00, a LV fault is
triggered, and the drive stops output then the motor coasts to a stop.
If the LV fault is triggered during operation, the drive stops output and the motor coasts to a stop.
There are three LV faults, LvA (LV during acceleration), Lvd (LV during deceleration), and Lvn
(LVin 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 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), 60 V (460V models) or 75V (575 models).
Over-Voltage Stall Prevention
Default: 380.0 / 760.0 / 975.0
115V / 230V models: 0.0–400.0 V
DC
460V models: 0.0–800.0 V
DC
575V models: 0.0–1000.0 V
DC
Setting Pr.06-01 to 0.0 disables the over-voltage stall prevention function (connected with
braking unit or brake resistor). Use this setting when braking units or brake resistors are
connected to the drive.
Setting Pr.06-01 to a value > 0.0 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.
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