Chapter 3 Electrical Installation; Wiring Of Power Cable; System Configuration; Maximum Steady State Ac And Dc Currents - Emerson Liebert APM 90 User Manual

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Chapter 3 Electrical Installation

This chapter mainly introduces the electrical installation of the UPS, including the wiring of the power cables
and signal cables.
After completing the mechanical installation of the UPS, it is required to connect the power cables and control
cables of the UPS. All the control cables, whether shielded or not, shall be kept away from the power cables.
1. Do not apply electrical power to the UPS before being authorised to do so by the commissioning engineer.
2. The UPS shall be installed by a qualified engineer in accordance with the information contained in this chapter.

3.1 Wiring Of Power Cable

3.1.1 System Configuration

The cable size of the system power cable shall meet the following requirement:
UPS input cable
The cable size of the UPS input cable differs with the UPS power ratings and input AC voltages, provided that it
meets the requirement of maximum input current, including the maximum battery charge current, as shown
in Table 3-1.
UPS bypass and output cable
The cable size of the UPS bypass and output cable differs with the UPS power rating and output AC voltages,
provided that it meets the requirement of nominal output or bypass current, as shown in Table 3-1.
Battery cable
Each UPS connects to its battery through the positive, negative and neutral battery cables. The cable size of
the battery cable differs with the UPS power ratings, provided that it meets the battery discharge current
requirement when the battery discharges to near EOD voltage, as shown in Table 3-1.

3.1.2 Maximum Steady State AC And DC Currents

The power cable must be selected according to the current and voltage values in Table 3-1, the local wiring
regulations, the environmental conditions (temperature and physical media) and requirements in IEC60950-1
Table 3-B.
UPS rating
(kVA/kW)
90/90 100/90
72/72 80/72
54/54 60/54
36/36 40/36
18/18 20/18
Chapter 3 Electrical Installation
Table 3-1 Maximum steady state AC and DC currents
Rated current (A)
Output/bypass current
Max.
at full load
input
1
current
380V
183 136 152 130
145 109 121 104
109 82 91
72 54 61
36 27 30 26
Liebert APM 90 Integrated Modular UPS User Manual
Warning: professional installation required
2
Positive/Negative
400V 415V
145 125 139
116 100 111
78 87 75 83
52 58 50 55
29 25 28
Busbar stud size
Input/battery
/Neutral Battery
output/bypass
discharge
current
3
current at EOD
265/265/132 M8
213/213/106 M8
160/160/80 M8
106/106/53 M8
53/53/26 M8
Recommen
ded torque
(N.m)
12
12
12
12
12