Emerson Liebert APM 90 - Chapter 3 Electrical Installation; 3.1 Wiring Of Power Cable; 3.1.1 System Configuration; 3.1.2 Maximum Steady State AC And DC Currents

16 Chapter 3 Electrical Installation
Liebert APM 90 Integrated Modular UPS User Manual
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.
Warning: professional installation required
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 ca
ble 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 ca
ble 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
Eac
h 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.
Table 3-1 Maximum steady state AC and DC currents
Rated current (A) Busbar stud size
Output/bypass current
2
at full load
UPS rating
(kVA/kW)
Max.
input
current
1
380V 400V 415V
Positive/Negative
/Neutral Battery
discharge
current
3
at EOD
Input/battery
output/bypass
current
Recommen
ded torque
(N.m)
90/90 100/90 183 136 152 130 145 125 139 265/265/132 M8 12
72/72 80/72 145 109 121 104 116 100 111 213/213/106 M8 12
54/54 60/54 109 82 91 78 87 75 83 160/160/80 M8 12
36/36 40/36 72 54 61 52 58 50 55 106/106/53 M8 12
18/18 20/18 36 27 30 26 29 25 28 53/53/26 M8 12