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Class A/B Expansion Board w/
PAD-5-CLSA
Releasing
Total
Total Current
Standby Time
(hrs)
Alarm Time (min)
AH required (no reserve)
Battery Reserve
AH Required (with reserve)
Note 1: Ensure that the standby Aux power is not entered twice when used as external power source for optional modules.
Note 2: Max Alarm NAC Current = 3A/Circuit, Max Releasing Circuit Current = 2A/Circuit
Note 3: *Alarm time requirements offer multiple selections. Choose the appropriate time based on the requirements of
your application. Options include: 5 minutes, 10 minutes, 15 minutes, 30 minutes, 60 minutes, and 120 minutes.
Battery Calculation
Battery backup is required for compliance to UL864 and ULC-S527. Refer to NFPA 72 and CAN/ULC-S524 for required
standby time. To determine the battery, use Table 7 above and fill-out the required parameters.
1. Record quantities of all required modules and devices per panel.
2. Device Load Calculation: Place the # of devices in the yellow column, multiply with the current draw and place results
in Standby/Alarm column. Add all results in the Standby/Alarm column to determine the total device current draw and
place the result in the appropriate SLC load cell.
3. Module Load Calculation: Place the # of modules and associated functions (e.g., LED zones, Bell Follower, etc) in the
yellow column and multiply with associated current draw and place results in the appropriate column (Standby or
Alarm).
4. Place the NAC load and Releasing load during alarm in the Alarm Column.
5. Add all results in the Standby Column to determine the System Standby Current.
6. Add all results in the Alarm Column to determine the System Alarm Current.
7. Place the required parameters: Standby Time (hr), Required Alarm Time (hr), Minimum Battery Size (AHr), Minimum
Battery Reserve (%)
8. Calculate Battery Requirement for System Standby (AHr) = System Standby Current (A) x Standby Time (hr)
9. Calculate Battery Requirement for System Alarm (Ahr) = System Alarm Current (A) x Alarm Time (hr)
10. Calculate the Battery Reserve (AH) = (Battery Reserve (%) / 100%) x (System Alarm Req + System Standby Req)
11. Calculate the minimum battery Requirement = Battery Reserve + System Alarm Req + System Standby Req.
Select the battery that meets or exceeds the final calculated amp hour rating.
26
Siemens Industry, Inc.
Smart Infrastructure
0.00000
1.25 mA per board
0
0.000
(included above)
0.000
24
0.00
30*
125%
System OK
0.000
Use 170W power supply
0.00
0.00
0.00
System OK
A6V10356958_en--_n
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