Calculating Current Draw And Standby Battery; 1: Worksheet Requirements; Maximum Battery Standby Load; 2: Current Draw Worksheet - Honeywell Silent knight 5895XL Installation And Operation Manual

Calculating Current Draw and Standby Battery

2.6 Calculating Current Draw and Standby Battery
This section is for helping you determine the current draw and standby battery needs for your installation.
2.6.1 Worksheet Requirements
The following steps must be taken when determining 5895XL current draw and standby battery requirements.

Filling in the Current Draw Worksheet, Table 2.4 (Section 2.6.2)
1. For the 5895XL, the worst case current draw is listed for the panel, addressable devices, and SLC expanders. Fill in the number of
addressable devices and expanders that will be used in the system and compute the current draw requirements for alarm and
standby. Record this information in Table 2.4 at Line A.
2. Add up the current draw for all auxiliary devices and record in the table at Line B.
3. Add up all notification appliance loads and record in the table at Line C.
4. For notification appliances and auxiliary devices not mentioned in the manual, refer to the device manual for the current ratings.
5. Make sure that the total alarm current you calculated, including current for the panel itself, does not exceed 6.0 A. This is the
maximum alarm current allowable.
6. Complete the remaining instructions in Table 2.4 for determining battery size requirements.

Maximum Battery Standby Load

Table 2.3 shows the maximum battery standby load for the 5895XL based on 24 and 60 hours of standby. The standby load calculations
of line G in the Current Draw Calculation Worksheet (Table 2.4) must be less than the number shown in Table 2.3 for the battery size
used and standby hours required.
* Required for NFPA 72 Auxiliary Protected Fire Alarm systems for Fire Alarm Service (City Box) and Remote
Station Protected Fire Alarm systems (Polarity Reversal) and Digital Alarm Communicator/Transmitter (DACT).
NOTE: 33AH max battery size for FM (Factory Mutual) installations
2.6.2 Current Draw Worksheet
For *each 5895XL in the installation, use Table 2.4 to determine current requirements during alarm battery standby operation when SK
SLC devices are installed.
For each device use this formula:
5895XL Intelligent Power Module
(Current draw from battery)
Additional 5895XL
(Daisy-chained to this module)
Addressable SLC Detectors
SK-PHOTO
SK-PHOTO-T
SK-HEAT
SK-HEAT-HT
SK-ACCLIMATE
SK-HEAT-ROR
2
SK-DUCT (includes PhotoR)
SK-BEAM (without integral test)
5895XL Manual - P/N 151142-L8:L 08/09/2017
Table 2.3 : Maximum Battery Standby Load
Rechargeable
Battery Size
7 AH
12 AH
17 AH
33 AH
6
Table 2.4 Current Draw Worksheet for SK SLC Devices
Device # of Devices
This column
1*
(7 max.)
Max. Load for 24 hrs. Standby,
5 mins. Alarm
270 mA
475 mA
685 mA
1370 mA
Current per Device
X This column =
Standby
Alarm:
Standby
Alarm:
Standby/Alarm:
SLC Standby/Alarm:
Aux. Pwr Standby:
Alarm:
Before You Begin Installing
*Max. Load for 60 hrs. Standby,
5 mins. Alarm
105 mA
190 mA
270 mA
540 mA
Standby
Current
Current per number of devices.
40 mA 40 mA
160 mA
10 mA mA
10 mA
1
.30 mA mA
mA
mA
mA
mA
mA
mA
2
mA
2
mA mA
8.5
mA
Alarm
Current
160 mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
9