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Installation
2.1 Site Preparation Checklist
Grounding
The UPS MUST be correctly grounded for proper operation.
Older facilities may have inadequate electrical grounding. A qualified electrician
should inspect it before installation to see it meets the local electrical code.
Branch Circuit Breaker Protection
To provide branch circuit protection, the utility line attached to the UPS’s input
MUST be protected by a circuit breaker certified for this use as per the local elec-
trical code.
The breaker’s minimum size is calculated by the following formula:
Minimum Breaker Size= UPS’s maximum input current / 0.8
The UPS’s maximum input current is read off of the UPS’s nameplate. For exam-
ple, if the nameplate gives the maximum input current as 20A, the circuit breaker
should be rated at least 25A.
For the FXM 1100, to reduce the risk of fire, connect a minimum of a 20A circuit
breaker (for 120VAC units) or a 10A (for 230VAC units).
Disconnects
The input and output lines to and from the UPS MUST have disconnect devices
attached.
Site Requirements
Install the UPS and batteries on a surface that supports the total weight. The input wires
must reach a suitably grounded power outlet and the load’s wires must reach the UPS’s
output terminal blocks.
Backup Generator (If Used)
In Generator Mode, the UPS’s range of acceptable input frequency and voltage is expand-
ed to accept the fluctuations created by a generator (
See
Section 3.4, “Programming the
UPS,” “Sense Type”).
Use a generator with electronic speed and voltage controls which produces less than 10%
voltage Total Harmonic Distortion (THD). Mechanical governors can force the UPS to run
continuously in Battery mode.
Before installation, make sure the generator’s output voltage is compatible with the UPS’s
input voltage requirements. To make sure the system runs smoothly, use a generator that
supplies twice as much power as drawn by the total load.
