Earth (Ground) Fault Detection At Start; Varying The Activation Level Of The Undervoltage Protective Function - Mitsubishi FR-A800 Instruction Manual

5.10.4

Earth (ground) fault detection at start

Select whether to enable/disable earth (ground) fault detection at start. When enabled, earth (ground) fault detection is
performed immediately after a start signal input to the inverter.
Pr. Name
249 Earth (ground) fault
H101 detection at start
• If a ground fault is detected at start while Pr.249 = "1", the output-side earth (ground) fault overcurrent (E.GF) is displayed
and the outputs are shut off. (Refer to
• The Pr.249 setting is enabled during V/F control and Advanced magnetic flux vector control
• When the Pr.72 PWM frequency selection selection setting is high, enable the ground fault detection at start.
NOTE
• Because of the detection performed at start, the output is delayed by approximately 20 ms at every start.
• Use Pr.249 to enable/disable ground fault detection at operation start. Ground faults are detected always during operation
regardless of the Pr.249 setting.
• If a smaller-capacity motor is used with the FR-A820-00340(5.5K) or higher and FR-A840-00170(5.5K) or higher, ground fault
protection may be insufficient.
5.10.5
Varying the activation level of the undervoltage
protective function
If the undervoltage protection (E.UVT) activates due to unstable voltage in the power supply, the undervoltage level (DC
bus voltage value) can be changed. (only available for 400 V class)
Pr. Name
598
Undervoltage level
H102
NOTE
• Do not use this function when switching to an external battery, since the inrush current when power is restored increases, as
the undervoltage level is decreased.
• The Pr.598 settings are only valid for 400 V class inverters.
• The Pr.598 setting is disabled during PM sensorless vector control. The Pr.598 setting is also invalid during PM sensorless
vector control for the first or second functions.
Initial value Setting range
0
0
1
page 656)
Initial value Setting range
350 to 430 VDC
9999
9999
(H) Protective function parameter
V/F V/F V/F
Description
Without the earth (ground) fault detection at start
With the earth (ground) fault detection at start
Description
Set the DC voltage value at which E.UVT occurs.
E.UVT occurs at 430 VDC
PARAMETERS
Magnetic flux Magnetic flux Magnetic flux
5
GROUP
H
341