Installation manual

Geo Direct PWM Amplifier
Connector PinOuts and Wiring 21
Transformers
Y-Y or Y- transformers should be used.
- Transformers are NOT advised. They try to balance phases dynamically, creating instances of
instability in the Geo Direct PWM Drive’s rectifying circuitry.
Note
A line reactor should be installed if a transformer or reliable source of
power is not available. Line reactors suppress harmonics bi-
directionally, eliminating low frequency spikes.
Fuses
High peak currents and high inrush currents demand the use of slow blow time delayed type fuses.
RK1 or RK5 (i.e. current limiting) classes are recommended. FRN-R and LPN-RK from Cooper
Bussmann or similar fuses can be used.
Magnetic Contactors
SC-E series from Fuji Electric or similar contactor can be used.
Line Filters
Line filters eliminate electromagnetic noise in a bi-directional manner (from and into the system).
T type filters are NOT recommended. PI type line filters are highly advised:
 Filter should be mounted on the same panel as the drive and power source.
 Filter should be mounted as close as possible to the power source.
 Filter should be mounted as close as possible to incoming cabinet power.
FN-258 series from Schaffner or similar filter can be used.
Voltage Suppressors
Voltage suppressors eliminate undesirable voltage spikes typically generated by the magnetic contactor or
external machinery in the plant.
This 3-phase voltage arrester from Phoenix Contact or similar suppressor can be used.