86 Program features
Implementing the undervoltage control (power loss ride-through)
Implement the undervoltage control function as follows:
• Check that the undervoltage control function of the drive is enabled with
parameter
• Parameter
parameter
(in scalar mode) to make flying
start (starting into a rotating motor) possible.
If the installation is equipped with a main contactor, prevent its tripping at the input
power break. For example, use a time delay relay (hold) in the contactor control
circuit.
WARNING!
Make sure that the flying restart of the motor will not cause any
danger. If you are in doubt, do not implement the undervoltage control function.
Voltage control and trip limits
The control and trip limits of the intermediate DC voltage regulator are relative to the
supply voltage as well as drive/inverter type. The DC voltage (
U
DC
) is approximately
1.41 times the line-to-line supply voltage, and is displayed by parameter
The following table shows the values of the selected DC voltage levels in volts. Note
that the absolute voltages vary according to drive/inverter type and AC supply voltage
range.
When adaptive voltage limit is enabled in parameter
:
DC voltage level [V]
95.01 Supply Voltage
See
Supply voltage range
[V]
180…415
Supply voltage
range [V]
440…480
Automatic /
Not selected
Overvoltage fault limit
842
842
842
Overvoltage control limit
779
779
779
Overvoltage warning limit
745
745
745
Undervoltage warning limit
0.85×1.41× par
value
1)
0.85×1.41×par
value
1)
0.85×1.41× par
value
1)
0.85×1.41×180 = 455
2)
0.85×1.41×440 = 527
2)
Undervoltage control limit
0.78×1.41×par
value
1)
0.78×1.41×par
value
1)
0.78×1.41×par
value
1)
0.78×1.41×180 = 418
2)
0.78×1.41×440 = 484
2)
Charging relay closing limit
0.78×1.41×par
value
1)
0.78×1.41×par
value
1)
0.78×1.41×par
value
1)
0.78×1.41×180 = 418
2)
0.78×1.41×440 = 484
2)
ACS180 FW.book Page 86 Tuesday, March 9, 2021 2:25 PM