Mechanical Installation
9
Dual-LIte
®
TRX
™
MBC
™
4. Connect the AC input supply cables between the power distribution panel and the Maintenance
Bypass input supply busbars (A-B-C or A-B-C-N terminals) and tighten the connections to the
proper torque (see
). Ensure correct phase rotation!
5. Connect the UPS Input
a. For two-breaker Dual-Lite TRX MBC’s
i.
If the system is a two-input type, connect the AC input supply cables between the Dual-
Lite TRX MBC and the UPS bypass input supply busbars (A-B-C or A-B-C-N terminals)
and between the power distribution panel and the UPS rectifier input supply busbars
(A-B-C or A-B-C-N terminals). Tighten the connections to the proper torque. Ensure
correct phase rotation!
ii. If the system is a single-input type, connect the AC input supply cables between the Dual-
Lite TRX MBC and the UPS bypass input supply busbars (A-B-C or A-B-C-N terminals)
and connect AC jumper connectors between UPS bypass input supply busbars and UPS
rectifier input supply busbars (A-B-C terminals). Tighten the connections to the proper
torque (see
). Ensure correct phase rotation!
6. Connect the system output power cables between the Dual-Lite TRX MBC output (A-B-C or A-B-
C-N terminals) and the critical load and tighten the connections to the proper torque (see
). Ensure correct phase rotation!
7. Connect the control wiring from the Dual-Lite TRX MBC terminal block TB1 to the Dual-Lite
TRX UPS Bypass Module (X9 J23 and J26). Tighten the connections to the proper torque (see
).
8. Replace the panels.
Notes
Refer to the Dual-Lite TRX UPS installation manual, SL-25648 for additional details about the
Dual-Lite TRX 10-30kVA UPS. The manual is available from Dual-Lite.
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable.
• Take special care when determining the size of the neutral cable, because current circulating on
the neutral cable may be greater than nominal current in the case of non-linear loads.
• The ground conductor should be sized according to local or NEC codes, cable lengths, type of
protection, etc. The ground cable connecting the UPS to the main ground system must follow the
most direct route possible.
• Consideration should be given to the use of smaller, paralleled cables for heavy currents, as a way
to ease installation.
• In most installations, the load equipment is connected to a distribution network of individually
protected busbars fed by the Dual-Lite TRX MBC output rather than being connected directly to
the Dual-Lite TRX MBC itself. Where this is the case, the Dual-Lite TRX MBC output cables can
be rated to suit the individual distribution network demands rather than being fully load-rated.
• When laying the power cables, do not form coils to avoid increasing formation of electromagnetic
interference.
Table 1
Control wiring for Dual-Lite TRX UPS to Dual-Lite TRX MBC
From Dual-Lite TRX
UPS Bypass Module
(X9 J23 and J26)
To Dual-Lite TRX MBC
Terminal Block (TB1)
J26-15
TB1-6
J26-13
TB1-5
J26-11
TB1-4
J26-9
TB1-3
J23-3
TB1-9
J23-4
TB1-11
J23-6
TB1-12
