Mitsubishi Electric FR-A700 Technical Manual page 347

2.17.5 Overspeed detection [Pr. 374]
[Pr. ] Name
374 Overspeed detection level
Motor speed *
[Pr. 374]
ALM
E.OS
2.17.6 Encoder signal loss detection [Pr. 376]
When the encoder signal is lost during encoder feedback
control, orientation control, or vector control, signal loss
detection (E.ECT) is activated to trip the inverter.
2.17.7 Earth (ground) fault detection at start [Pr. 249]
You can choose whether to make earth (ground) fault detection at start valid or invalid.
[Pr.] Name
249 Earth (ground) fault detection at start
When [Pr.249=1], earth (ground) fault detection is
performed at start. Earth (ground) fault detection is
performed only after start signal is input to the inverter.
Protective function does not operate for the ground (earth)
fault, which occurs while inverter is running.
Because the detection is performed at a start, output
delays for about 20ms at every start.
A700
(A700)
Initial Setting
Value Range
140Hz 0 to 400Hz
* The output frequency and [Pr. 374] are compared during Real sensorless
Coast to stop
vector control.
Time
ON
Initial Value Setting Range
0
Description
When the motor speed reaches or exceeds the speed set in [Pr. 374]
during encoder feedback control, Real sensorless vector control, or
vector control, over speed (E.OS) occurs and trips the inverter.
A700
(A700)
[Pr. ] Name
Encoder signal
loss detection
376
enable/disable
selection
E700 D700
0 Without earth (ground) fault detection
1 With earth (ground) fault detection
If earth (ground) fault is detected when [Pr.249=1], output
side earth (ground) fault overcurrent (E.GF) is output, and
the inverter output is shutoff. (Refer to page 99 )
If motor capacity is smaller than the inverter capacity in
5.5K or more, ground (earth) fault protection may not
operate.
381
PARAMETER
Initial Setting
Description
Value Range
Signal loss
0
detection is invalid
0
Signal loss
1
detection is valid
Description
2