Wiring Preparation; Power Cable Installation - Liebert Nfinity User Manual

Wiring Preparation

WARNING:
Please
thoroughly before attempting to install wiring to
this unit.
Be sure that the unit is not connected to any AC
mains power source before installing any wiring
to this unit. This UPS should be installed by a
qualified / certified electrician.
Removing the Cover Plates
On the back of the
UPS, cover plates
are over the input
and output
terminals, as
shown on right.
Remove these
using a Phillips
screwdriver. Keep
screws and plates
to one side.
Configuring the Bypass Voltage (TB2)
(Transformer Models Only)
The UPS voltage is factory set to 230V / 240V.
Should the user have a utility supply of 220 V,
the bypass voltage jumper will have to be
changed to ensure correct output voltage during
bypass mode.
Cable Installation
read this section
14

Power Cable Installation

Refer to the charts below when selecting cables:
8 Bay Power Cable and Protection Ratings
220V
Max Input
60 A
Current
Input
63 A
Protection
Max Output
39 A
Current
12 Bay Power Cable and Protection Ratings
220V
Max Input
84 A
Current
Input
100 A
Protection
Max Output
51 A
Current
Terminal Max: 35 mm²
Details Min: 16 mm²
Torque Rating: 2.5-3 Nm
90°C rated copper wire is recommended
Notes:
If an output transformer is fitted and the start-up is on bypass
the UPS has a 3-cycle inrush current that is 6 times the rated
output current. This must be taken into account when
selecting the overload protection device at the AC input
supply distribution point. To avoid random tripping on start
up, it is recommended that the AC input supply be protected
with a circuit breaker capable of withstanding this initial
inrush. (An MCB rated to curve 'D' or specified as being
'Type 4' (British standard) is suitable for this purpose).
This UPS is fitted with EMI suppression filters.
leakage current is less than 40mA.
state earth leakage currents may occur when starting the
equipment. This should be taken into account when
selecting instantaneous RCCB or RCCD devices, as the
earth leakage currents of both the UPS and load will be
carried by these.
An overcurrent protection device (circuit breaker or fused
disconnect switch) must be installed for the AC output.
This UPS does not incorporate automatic back feed
protection. A warning label must be fitted to all primary
power isolators stating: ISOLATE
POWER SYSTEM (UPS) BEFORE WORKING ON THIS
CIRCUIT. Earth in accordance with local electrical codes
230V 240V
60 A 60 A
63 A 63 A
37 A 35 A
230V 240V
84 A 84 A
100 A 100 A
49 A 47 A
Earth
Transient and steady
UNINTERRUPTIBLE