Output Connections To The Load; Sw 5550Ae Output Connections - Elgar SW 5550AE Operation Manual

SW 5550AE • SW 3700AE • SW 1850AE
2.9

Output Connections to the Load

2.9.1

SW 5550AE Output Connections

The Model SW 5550AE can power 1-phase, 2-phase and 3-phase loads. Local or
remote sensing can be used; if no sense lines are connected, the unit automatically
reverts to local sense. Outputs may be directly paralleled for greater power. If the
outputs are paralleled it is important to program the unit to the parallel mode before
shorting the outputs together (refer to Figure 2–4). Outputs cannot be placed in series
since the Neutral is common. However, by programming two phases 180º apart, double
voltage, single phase is achieved.
Any phase sequence of wiring can be used.
The sense Neutral is also common. Thus, it is important to wire the sense wires
properly (refer to Figure 2–5). If remote sense is used:
Sense A is connected to Power A;
•
Sense B is connected to Power B;
•
Sense C is connected to Power C; and
•
Neutral Sense is connected to Neutral Power.
•
Output power neutral must be connected to chassis ground for
safe operation. The SW system is shipped with a green/yellow wire
connected from output power neutral to chassis ground.
It is important that the Neutral not be >20V away from the chassis
potential; the unit will shut down if this voltage is exceeded.
If a transformer or inductive load is present, the unit should be programmed to AC. This
prevents small amounts of DC being generated, which may saturate the magnetics.
For best performance, the sense leads should be connected and output neutral should
be connected to chassis ground.
Operation Manual
Installation
2-13