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

 Cooling fan operation selection during the test operation (Pr.244 = "1000,
1001, 1101 to 1105" (P.H106 = "1"))
• When P.H106 = "1" or Pr.244 = "1000, 1001, or 1101 to 1105", the cooling fan can be set to always OFF during Vector
control test operation or PM sensorless vector control test operation.
NOTE
• The cooling fan is installed on the FR-A820-00105(1.5K) or higher and the FR-A840-00083(2.2K) or higher.
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.190 to Pr.196 (Output terminal function

5.10.4 Earth (ground) fault detection at start

V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Select whether to make earth (ground) fault detection at start. When enabled, earth (ground) fault detection is performed
immediately after a start signal input to the inverter.
Pr.
249
H101
• 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
• Pr.249 setting is enabled during V/F control and Advanced magnetic flux vector control.
• When the Pr.72 PWM frequency selection setting is high, enable the ground fault detection at start.
NOTE
• Because the detection is performed at start, output is delayed for approx. 20 ms 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.
5.10.5 Varying the activation level of the undervoltage
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.
Pr.
598
Undervoltage level
H102
*1 For the 200 V class
*2 For the 400 V class
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.
• For the 200 V class inverters, the setting is available for the FR-A820-02330(45K) or lower.
• The Pr.598 setting is valid for induction motors. When either of the first or second motor is a PM motor, the Pr.598 setting is
invalid.

5.10.6 Initiating a protective function

A fault (protective function) is initiated by setting the parameter.
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Name
Earth (ground) fault detection at
start
page
protective function
Name Initial value
9999
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Initial value Setting range
0
0
1
790.)
Setting range
*1
175 to 215 VDC
Set the DC voltage value at which E.UVT occurs.
*2
350 to 430 VDC
E.UVT occurs at 215 VDC (200 V class) / 430 VDC (400
9999
V class).
Description
Without the earth (ground) fault detection at
start
With the earth (ground) fault detection at start
Description
5. PARAMETERS
5.10 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
425