Tripp Lite SUTX20K Owner's Manual page 21

3. Installation and Wiring
• Only use the same type of batteries from the same supplier. Never combine old, new or different Ah batteries at the same time.
• The number of batteries must meet UPS requirements.
• Do not connect the batteries in reverse.
• Use a voltage meter to measure whether the total voltage, after the external battery cabinet connection, is around 12.5V DC × the
total number of batteries.
• When connecting a non-Tripp Lite external battery cabinet to the UPS, it is compulsory to install an appropriate non-fuse DC breaker
and fast-acting fuses (when short-circuit occurs, the melting current must be 5~6 times of the battery fuse's rating current).
• To extend battery backup time, connect several external battery cabinets to the UPS.
Note: Recharge time will be extended; take note of charger capacity.
• To extend battery backup time, external batteries may be connected to the UPS.
Rating Power (kVA)
20
40
• The breaker must be a 4-pole non-fuse DC breaker with characteristics of 1-pole 250V DC, 2-pole 500V DC and 3-pole 750V DC.
Follow Figure 3-17 or Figure 3-18 to install a 4-pole non-fuse DC breaker and fast-acting fuses between the UPS and the non-
Tripp Lite external battery cabinet.
Circuit Breaker
Rating Current (A)
63
125
+
N
External
-
Battery
Cabinet
4-pole Non-fuse
DC Breaker
(Figure 3-17: A 4-pole Non-fuse DC Breaker and Fast-acting Fuses Installation I)
+
N
-
External
Battery
Cabinet
(Figure 3-18: A 4-pole Non-fuse DC Breaker and Fast-acting Fuses Installation II)
Battery Cable (mm²)
10
25
Fast-acting
Fuses
4-pole Non-fuse Fast-acting
DC Breaker Fuses
21
Battery Fuse (A)
+
N
-
+
N
-
63
125