AT&T System 75 8520T User Manual Page 29
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Typical Standby Battery Life
A good estimate of your system’s standby battery
life can be obtained by the following method:
1.
Begin with the battery FULLY charged.
2.
Connect an ammeter (set to a safe-about
2 ampere-range) in either leg of the
battery harness, in series, with the proper
polarity to read the current provided by the
battery.
3.
Unplug the system’s power transformer
from the outlet.
4.
Read the current being drawn by the
system.
5.
Add to this current 20 ma for each Display
Control Keypad, and 12 ma for each
Control Keypad that are in the system.
This will calculate the total standby current
drain.
6.
Use the current that is equal to (or greater
than) yours, on the curve (Figure 2-6).
This figure shows battery voltage (verti-
cally) compared to different amounts of
current drain. Across the bottom is the
amount of time that the battery has had to
supply the current.
7.
Read the time where your current line
drops below a voltage of 9.8 volts. This is
the amount of time the system should
operate in the standby mode before the
voltage causes it to call in a low power
warning and initiate its Suspend Opera-
tion.
8.
If the standby time is too short, you must
add battery capacity. You can add
another identical battery in parallel (plus
terminal connected to plus, and minus
terminal to minus) to double the capacity.
NOTE:
Two batteries take twice as much charge cur-
rent-a two-battery system is not UL Listed. When
using two batteries in parallel, use one-half of the
measured current while referring to the chart.
12.0
11.0
Terminal Voltage
.
/
10.0
9.0
1
2
4
6
810
20
4060 2 4
6
810
20
40
60
2
4
6
810
20
DISCHARGE TIME
Figure 2-6Typical Battery Life vs. Current, for 7 Amp-Hour Battery
AT&T Security System 8300 Installer’s Manual
2-1
1
- AT&T Security System 8300 1
- CCU Main Board and 2
- Figure O-l. CCU Main Board 3
- Contents 4
- Operations 6
- Programming the System 10
- Wireless Considerations 10
- 2 Installation 11
- Introduction 12
- 8301 Software Package 13
- The Parts of the 14
- Smoke Detector (Model 8520) 16
- WARNING: 16
- Other Devices 18
- Installation 19
- Basic Installation Guidelines 20
- Wiring Data 21
- Residential UL Requirements 23
- Commercial UL Requirements 24
- MAIN BOARD 25
- use Green Wire 26
- (earth) ground for 26
- UL Commercial 26
- Burglary 26
- Battery and 27
- Typical Standby Battery Life 29
- Installing Specific Devices 32
- Mount/Install: 32
- THIS MODEL 8300 CMP 36
- CIRCUIT PACK MUST BE USED 36
- WITH THE MODEL 8345 36
- OWER TRANSFORMER 37
- Two-Line S 39
- OUT&% 40
- O”TS:DOE LINE 40
- Display Control Keypad 43
- Appendix 44
- 106776164 106776164 AND 45
- Snap hinged mou 46
- LCD Viewing 47
- -Angle Adjust 47
- Keyswitch# 48
- Figure 2-18 UL Bell Wiring 50
- Manual Programming 52
- Example: 53
- Moving Through the Grid 55
- Example: Key Terms 58
- Q use as 59
- Series: Modem and Dialer 63
- 211 Touch Tone or Pulse Dial 63
- 7 channels defined in 63
- Receiver 64
- Series: Receiver 2 65
- 241 Rcvr 2 Phone Number 65
- 1 = 1 = 69
- 3-203-20 70
- 731 Relay 71
- Series: X-10 72
- 741 X-10 House Code 72
- Programming Error Messages 73
- UL Programming Requirements 74
- Extended, and 76
- Reporting Data 76
- B for RF Sensor Supervision 77
- 1 for CCU Low Battery 77
- E for RF Sensor Low Battery 77
- 1 is an Automatic Test 77
- Troubleshooting 81
- Initial Testing 81
- Coming Home on a Rainy Day 84
- Keypad Usage 86
- (Keypads in the Bedroom) 86
- Keypad as Telephone 86
- Listen-In Keypad 87
- The Alarm Cycle 88
- Resetting the System 88
- Reception Factors 92
- Installing 93
- Wireless Components 93
- Settings/Connections: 94
- Antenna Coupling Unit 95
- Universal Transmitter 98
- Sensor Number 102
- Figure A-7 103
- Walk Test LED: 105
- Listen-In/Talk-Back 106
- EXAMPLE: 108
- EXAMPLE 1: 111
- Programming 112
- the Security System 8300 112
- Monitoring Service Receiver 113
- Requirements 113
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