1
5
9
3
7
11
2
6
10
4
8
12
13
14
1
DASHED LINES INDICATE USER-SUPPLIED
PARTS AND CABLES.
AC Input
Battery
Output
Grounding Terminals
R
R
S
S
T
T
N
N
N
+
–
15
6 – Wiring
(continued)
6-7 AC Input/Output Wiring (Single UPS—SUS)
(continued)
3
4
5
6-8 AC Input/Output Wiring: Parallel Configuration – 2x MUS (Multiple Unit System)
Parallel Configuration – MUS Warnings:
• The total cable length for each UPS must be within 10% of each of the other parallel-configured UPS in order to prevent
unbalanced load sharing between the individual UPS. (IP1 + OP1 = IP2 + OP2 = IP3 + OP3 = IP4 + OP4, minimum/maximum
deviation must be < 10%).
• Parallel configurations are supported for 2, 3, or 4 UPS units only. Do not attempt to configure more than 4 UPS systems via
parallel configuration.
• Each UPS system to be parallel configured for either N+1 redundancy or capacity, must have the same rating, kVA capacity, and
system and power module level firmware version (see Section 10-6). Attempting to configure dissimilar UPS systems may be
inhibited or may cause damage to the UPS systems and create a risk of personal injury and property damage.
• Each UPS must have its parallel group set to 2 and a different “Parallel ID” that indicates the UPS systems are operating in
parallel (see
Section 10-5-5
for more details).
•
Follow the steps in
Section 6-7
, wiring the UPS systems as shown in the diagram
1
.
•
Each UPS is shipped with (1) parallel configuration cable included. Connect each UPS parallel communication port(s) as shown and select
the correct position of the parallel port dip switches (either both ON (down) or both OFF (up) as shown in the diagram
1
.
1
2
•
Connect the UPS system’s primary grounding terminal
to your facility’s earth ground with a 4 AWG (25 mm²)
minimum equipment grounding conductor cable. Keep
the EGC cable connected at all times after installation.
•
Confirm the phase of each cable, then connect the cables
according to the UPS system terminal block diagram in
Section 6-3
. See
Section 6-5
for cable size requirements.
Cabling should be protected by flexible conduit and
routed through the appropriate knockouts in the terminal
block cover.
Warning: Observe proper phase
rotation
by connecting R to R, S to S, T to T and N to N.
Failure to observe proper phase rotation will damage
the UPS system and create a risk of personal injury
and property damage.
•
Replace the UPS system’s terminal block cover.
12-212-93-3141.indb 15
12/28/2012 11:17:25 AM
