C&D Technologies TEL12-105FS, Installation And Operating Procedures

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Step 3b. If more than one 48 VDC string is within the enclosure, number the additional batteries the same way.
Identify the bottom string as string A with the string above as string B and so on (see Figure 2).
Step 4. Properly insulate the String A power supply negative (-) cable lug (cable coming from circuit breaker
shown in Figure 1, if a circuit breaker is used) that will eventually be connected to battery 4’s negative (-)
terminal.
Step 5. Connect String A’s power supply positive (+) cable onto battery number 1’s positive (+) terminal using
the provided bolt and washer. Tighten bolt washer assembly hand tight.
Step 6. Using the provided bus bar and hardware (bolt and washer), connect between battery 1’s negative (-)
terminal to battery 2’s positive (+) terminal. Tighten bolt washer assembly hand tight.
Step 7. Using the provided bus bar and hardware (bolt and washer), connect between battery 2’s negative (-)
terminal to battery 3’s positive (+) terminal. Before inserting the washer and bolt onto battery 2’s negative (-)
terminal, place the power supply’s thermal probe on top of the bus bar (if applicable noted on Figure 1). Once
lined up insert the washer and bolt onto battery 2’s negative (-) terminal as well as battery 3’s positive (+)
terminal. Tighten bolt washer assembly hand tight.
Step 8. Using the provided bus bar and hardware (bolt and washer), connect between battery 3’s negative (-)
terminal to battery 4’s positive (+) terminal. DO NOT connect the power supply negative cable to battery 4’s
negative (-) terminal.
Step 9. Torque all the bolt washer assemblies as per the inch-pound specifications in Table 1 (except the
remaining negative (-) power supply cable).
Step 10. Carefully remove the earlier applied insulation from the power supply negative (-) cable lug. Do not
let the power supply negative (-) cable touch any terminals or any conductive surface.
Step 11. Switch the string A circuit breaker to the “on” position, assuming a positive (-) leg circuit breaker as
noted in Figure 1 (if applicable).
Step 12. To make sure the battery is connected properly, place the voltmeter’s positive (+) probe on battery 4’s
positive (+) terminal and the voltmeter’s negative (-) probe to the power supplies negative (-) lug. Check to
make sure the polarity is correct (not negative). If the value is negative (-), then the system was not wired
properly and must be corrected before it is hooked up to the power supply.
Step 13. If step 12’s value was negative (-),
do not connect the negative (-) cable lug to battery 4’s negative (-)
terminal, again wrap and insulate the enclosures negative (-) cable’s lug. Switch String A circuit breaker to the
“off” position (if applicable).
Step 14. Connect the power supply negative (-) cable lug to Battery 4’s negative (-) terminal and torque to the
specification in table 1.
Step 15. Switch string A’s circuit breaker to the “on” position (if applicable).
Step 16. Replace the previously removed terminal protectors.
Step 17. Repeat the above steps on String B, String C, etc.
24VDC connection of individual front access batteries
Front access batteries are heavy, typically over 100 pounds each. Make sure the proper lifting and
moving arrangements to safely handle this weight have been considered before traveling to the site.
Note: Disconnect (isolate) the battery string(s) being installed from the DC source by turning
the circuit breaker off, if so equipped as noted in Figure 4.