6th edition, 22.05.2023
7000.05060, 6th edition, 22.05.2023
7000.05060
Installation
54
4.3.6.2
PWM filter (motor-side)
The PWM filters are designed for the maximum motor supply voltage with a nominal value
of 50 V (+10%) and allow a nominal motor current of 1, 3 or 8 ampere. With DC-motors, the
supply line RMS value can be used. A peak current of 3 s can be assumed.
For the proper filter effect, all PWM filters require a 0 V connection, which should be con
-
nected as short as possible to the 0 V voltage (GND) of the motor supply (connection X5 of
the supply side).
4.3.6.3
Emission-reducing, ferrite-based filters (motor side)
These filters only require three phase connections. The 0 V return line (see chap. 4.3.6.2,
p. 54) is not required. All PWM frequencies can be used. The filters reduce the rise time of
the motor voltage/current and thereby reduce the high-frequency coupling currents on the
shield.
4.3.6.4
Input-side filters
These filters are for applications that either cannot use the motor filter (e.g., integrated
controllers) or in which the filtering by the motor filters is not sufficient. In this case, two fil
-
tering measures are used:
Measure comparable to large capacitors (approx. >100 µF) as close as possible to the
controller and, where possible, low-ESR capacitances
Discharge of common-mode interference with a common-mode choke, a low-pass filter
and capacitors between functional earth and DC power supply
4.3.6.5
Insulation resistance
The filters from FAULHABER are not intended for an insulation resistance test. Discharging
of the common-mode interference with capacitors prevents a meaningful result from an
insulation resistance test.
The motor filters are only suitable for the PWM frequency of 100 kHz. Lower PWM fre
-
quencies must be explicitly tested, as the power losses increase at lower PWM fre
-
quency.