Ac Line Input Fuses; External Emc Filters (Optional); Ac Line Choke; Pre-Charge Considerations - Parker AC30P Hardware Installation Manual

6-8
Associated Equipment - Power Stack

AC Line Input Fuses

Refer to the installation manual of the DC supply unit.

External EMC Filters (optional)

Refer to the installation manual of the DC supply unit.

AC Line Choke

The DC supply unit may have minimum inductance requirements to satisfy or it may include an internal line choke (e.g., AC30
regenerative DC supply unit 380-5xxxx...).
If an external AC line choke is required, then the inductance value is determined by the sum of the motor currents attached to the
associated output stages and supply voltage.
For example:
If a 7.5kW, 4 pole, 400VAC motor has a FLC of 14A,
If a 22kW, 4 pole, 400VAC motor has a FLC of 45A,
If a 37kW, 4 pole, 400VAC motor has a FLC of 66A,
Then a system with 4x 7.5kW motors, 2x 22kW and 1x 37kW has a total current of 212A.
If it is known that one of the 22kW motors is overhauled during normal operation, then that motor current can be subtracted from and not
added to the total load current. In this case, the total load current would be reduced to 122A.
The value of the AC line choke is then calculated using the following formula:
Inductance per phase

Pre-charge Considerations

The AC30 regenerative DC supply unit (380-5xxxx...) is required to pre-charge the DC bus capacitance at power up. The 380-5xxxx...
internal pre-charge circuitry should be rated (in terms of peak power and impulse energy) to charge the total DC bus capacitance, and
should be rated to carry 45W to the internal power supply of each drive, without dropping more than 40V.
V
line-to-line
L (H) =
phase
272 I f
x x
total
Where:
V
= RMS line-to-line supply voltage (V)
line-to-line
I = Total load current (A)
total
f
= supply frequency (Hz)
AC30 series Variable Speed Inverter