187 To 264 Vrms 3-Phase Operation (3-Wire Usa); 342 To 457 Vrms 3-Phase Operation (4-Wire Intl); Single-Phase Input Connections - Elgar SW 5550AE Operation Manual

Installation
2.8.1

187 to 264 VRMS 3-Phase Operation (3-Wire USA)

Connect the input wires to the phase A (F1), B (F2), and C (F3) input fuse terminals
(no Neutral is required). Ensure that the chassis safety ground is also connected.
Use cables with ratings equal to or greater than the current rating listed on the unit or in
Table 2–7. Any phase sequence of wiring can be used.
2.8.2

342 to 457 VRMS 3-Phase Operation (4-Wire INTL)

It is essential that the Neutral connection is present when using the unit. An external
circuit breaker is required for the 3-phase voltages. Only those units factory set at this
voltage will operate at this voltage.
CAUTION!
For units built before June 2004, the Neutral must not be broken by
an external switch. Severe damage to the unit may occur if Neutral is
broken and phase voltage is present.
Connect the input wires to phases A (F1), B (F2), C (F3) and Neutral. Ensure that the
chassis safety ground is also connected. Use cables with ratings equal to or greater
than the current rating listed on the unit or in Table 2–7.
2.8.3

Single-Phase Input Connections

The SW system is designed for three-phase input power operation, either 3-wire (USA)
or 4-wire (EUR) plus a chassis safety ground. However, if only single-phase input
power is available, the configurations listed in Table 2–8 are possible.
An overcurrent protection device and a device for disconnecting the single-phase
energy supply source are required as indicated in Section 2.8 above.
2-12
SW 5550AE • SW 3700AE • SW 1850AE
Operation Manual