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TW 3700 • TW 5550
2 .9
OU T P U T CONNE CT I ONS T O T H E L OAD
2 .9 .1
T W 5 5 5 0 OU T P U T CONNE CT I ONS
The Model TW 5550 can power 1-phase, 2-phase and 3-phase loads. Local or remote
sensing can be used. If local sense is desired, for best regulation, jumper Sense A to
Output A, Sense B to Output B, etc. 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
180 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 TW 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.
For -101 units, the Green/Yellow wire can be removed and the
neutral can float up to 156V away from chassis potential.
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.
The output power and sense leads should be shielded and the shield connected to the
chassis to prevent noise pickup (or radiation to sensitive circuits in the vicinity). Again,
the shield should be connected to chassis ground.
Due to the high voltages present, 312 VRMS line-to-neutral and 437 VRMS line-to-line
cables rated to these voltages must be used for both the Power and Sense leads.
Elgar TrueWave
Installation
2-11
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