GWF-7075 Manual —
LS10147-002GF-E:G 10/5/2022
17
Calculating Current Draw and Standby Battery
Prerequisites for Installation
Maximum Battery Standby Load
Table 3.3 shows the maximum battery standby load for the GWF-7075 based on 24 and 60 hours of standby. The standby load calculations of
line G in the Current Draw Calculation Worksheet (Table 3.2) must be less than the number shown in Table 3.3 for the battery size used and
standby hours required.
G
Multiply lines E and F.
Total standby AH
AH
H
Alarm sounding period in hours. (For example, 5 minutes = 0.0833 hours)
H
I
Multiply lines E and H.
Total alarm AH
AH
J
Add lines G and I.
AH
Multiply by the Derating Factor
1.25
Total ampere hours required
7
AH
1
The FACP can only support 5 devices with LEDs on. The current draw has been added to the panels alarm current.
2
Total does not include isolator devices or accessory bases.
3
The ABD-RT2F draws a maximum of 500mA from auxiliary power when the test feature is used. This should be considered when
determining auxiliary power capacity but not calculated into current requirements for everyday operation.
4
The ASD-PL3R/-IV is sold separately from the DNR. Current draw for the DNR + ASD-PL3R/-IV is calculated by increasing the “Number of
Devices” column for each ASD-PL3R/-IV used with a DNR.
5
Maximum SBUS address capacity is determined by the amount of SBUS bandwidth consumed by each SBUS module. Refer to
Section 4.6.2 for SBUS limitations.
6
If there are door holders in the system, there is no need to consider door holder current for alarm/battery standby, because power is
removed during that time. However, during normal operation, door holders draw current and must be included in the 1.8 A total current that
can be drawn from the panel.
7
Use next size battery with capacity greater than required.
Rechargeable
Battery Size
Max. Load for 24 hrs. Standby,
5 mins. Alarm
1
Max. Load for 60 hrs. Standby,
5 mins. Alarm
1
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).
7 AH
270 mA
105 mA
12 AH
475 mA
190 mA
17 AH
685 mA
270 mA
33 AH
1370 mA
540 mA
Table 3.3 Maximum Battery Standby Load
Device
# of Devices
Current per Device
Standby
Current
Alarm Current
Table 3.2 Current Draw Worksheet for IDP SLC Devices (Continued)
Содержание Honeywell GWF-7075
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