TW 5250 • TW 3500 • TW 1750 Operation
Elgar TrueWave 3-25
3.11 MASTER/SLAVE OPERATION
3.11.1 OVERVIEW
The TW series power supply provides the capability of being paralleled at the chassis
level. If two TW supplies are “chained” (multiple TW units connected in a Master/Slave
configuration), the system ampacities are multiplied. The TW units must be the same
model number (the same power capability) and the outputs of the TWs must be
connected properly. See Figures 3-1 and 3-2.
Example: Three TW 5250 models are chained (1 master, 2 slaves) and operated in 3
phase low voltage range mode (see Figure 3-1), the three phases will each
support 39 amps. In high range, these three phases will each support 19.5
amps.
If the TW 5250 master is configured to operate in the parallel mode (see
Figure 3-2) with the three chassis configuration, the low range sourcing
capability is 117 amps. In high range this configuration will source 58.5
amps.
3.11.2 MASTER/SLAVE: STEP BY STEP INSTRUCTIONS
The accessory master/slave kit (Elgar p/n 5161608-01) contains one slave cable and
one breakout box together with attachment hardware.
To setup the TW system into chained mode:
1. If less than three units are being chained, proceed to step 3.
2. Install one slave cable breakout box onto each slave (elgar p/n 5161583-01). Do
not attach the slave cable(s) at this time.
3. Connect the power input wiring to the master and slave(s).
4. At this time the slave cable(s) (Elgar p/n 5161586-01) should not be installed and
the load wiring should not be connected to the A,B, and C phase output
terminals.
5. Choose a TW unit to be the “Master” and power it on.
6. If the TW units are to be operated in Parallel mode (see Figure 3-2) it is
imperative that the TW master unit be placed in Parallel mode and the Memory 0
location is updated to place the Master into parallel mode every time the units
are powered. Perform section: 3.10.21 and then perform section 3.10.12 on this
master TW.
