Chapter 2 Battery installation 13
LIEBERT APM UPS Module And Parallel System 30kVA~150kVA User Manual
1.5.3 UPS Output
In the eventuality that an external distribution panel is used for load distribution, the selection of protective devices
must provide discrimination with those that are used at the input to the UPS (see Tab.
9-7).
1.6 Power Cables
Design the cables according to the descriptions in this section and local regulatory wiring standards, and the
environmental conditions (temperature and physical support media) should be taken into consideration. Refer to
IEC60950-1 Table 3B Cabling.
Warning
FAILURE TO FOLLOW ADEQUATE EARTHING PROCEDURES CAN RESULT IN EMI, ELECTRIC SHOCK HAZARD, OR RISK
OF FIRE, SHOULD AN EARTH FAULT OCCUR.
Rated current (A)
Busbar stud size
Mains input current at full
load and battery
charging
1. 2 .3
Output current at
full load
2
Battery discharging current at E.O.D
=1.67V , no overload
Input /Output/
Bypass cables
UPS
power
(kVA)
380V
400V
415V 380V 400V 415V
30
Batt/string
32
batt/string
40
batt/string
Bolt
Diameter of
hole (mm)
External
Battery
Cable
(bolt)
Torque
(Nm)
150
278
264
254
228
217
209
526
493
394
120
222
211
204
183
174
167
421
394
316
90
167
159
153
137
130
126
316
296
237
60
111
106
102
92
87
84
211
197
158
30
56
53
51
46
44
42
106
99
79
M8
8
M8
5
Tab.
1-3 Maximum steady state AC and DC Current
Note:
1. Input current of common input configurations of rectifier and bypass
2. Take special care when determining the size of the output and bypass neutral cable, as the current circulating on
the neutral cable may be greater than nominal current in the case of non-linear loads, which is usually 1.732 times of
rated currents..
3. Add 7 A per each redundant Power Module
The earth cable connecting the UPS to the main ground system must follow the most direct route possible. The earth
conductor should be sized according to the fault rating, cable lengths, type of protection, etc. According to
AS/IEC60950-1, the cross section area of the conductor is 80mm
2
(150kVA).
When sizing battery cables, a maximum volt drop of 4Vdc. is permissible at the current ratings given in
Tab.
1-3
. The
load equipment is connected to a distribution network of individually protected busbars fed by the UPS output rather
than connected directly to the UPS. In parallel multi-module systems, the output cable of each ups rack unit should
be kept at equal length between the output of the ups rack output terminals and the parallel distribution busbar to
avoid affecting the shared current. When laying the power cables, do not form coils, so as to avoid the formation of
electromagnetic interference.
See
Chapter 4 Installation Drawing
for the positions of wiring terminals.
Warning
FAILURE TO FOLLOW ADEQUATE EARTHING PROCEDURES CAN RESULT IN EMI, ELECTRIC SHOCK HAZARD OR RISK
OF FIRE, SHOULD AN EARTH FAULT OCCUR.
