Cooper Security i-on 16 Podręcznik Użytkownika Pobierz pdf (Strona 12)

i-on30EX

Page 8

Power Availability

Before connecting any external devices to

the control unit, you must make sure that

the control unit can provide sufficient

current to power the system during a mains

failure for the time required to meet the

appropriate standard.

EN51031-1 Grade 2 and PD6662 Grade 2

both require 12 hours standby time.

Note: When calculating the average load

during the standby time period you must

allow for at least two periods in alarm. To

take the worst case these two periods of

alarm should each be 15 minutes long, the

maximum permitted in EN50131-1 section

8.6.

The amount of current available from the

control unit depends on the size of battery

fitted and its health. The current taken by

the control unit pcb, communicator and

keypads is given in Technical Specifications

– EN50131-6 Ratings on page 28.

The following calculation shows a simplified

example: in an alarm system with an i-

on30EX control unit, two i-kp01 keypads,

and 20 wired PIRs the system takes the

following total quiescent current:

Device

Current

Control unit PCB

100mA

15 x PIRs at 15mA each

225mA

1 x (wired expander)

20mA

2 x i-kp01 at 30mA each

(backlights off)

60mA

Siren (quiescent)

25mA

Total

430mA

During an alarm, these figures become:

Device

Current

Control unit PCB

120mA

15 x PIRs at 15mA each

225mA

1 x (wired expander)

20mA

2 x i-kp01 at 60mA each

(backlights off)

120mA

Siren (in alarm)

400mA

Total

885mA

The total amp hours required =

(0.430 A x 11.5h) + (0.885A x 0.5h) =

5.39Ah

One new, fully charged, 7Ah battery can

provide the charge required by the example

system and would meet the Grade 2

requirements.

Note: All current drawn from the Aux

terminals (12V) must be included in the

overall calculation.

CAUTION: Ensure that the system does not

demand more than the maximum current

available from the control unit during an

alarm, see page 28.

Bus Cabling

Requirements

Cable Type

In general, the control unit requires

standard 7/0.2 un-screened four core alarm

cable for wiring the bus.

For maximum performance in harsh

environments use twisted pair screened

cable with a characteristic impedance of

100-120ohms eg: Belden 8132 or cable

designed for RS485.

Use one pair for data lines A and B. Use the

other pair for 12V and 0V. For optimum

performance the voltage at the keypads

and expanders should be greater than 12V.

Screened cable may prove necessary if the

installation site has equipment that

produces high levels of R.F. (Radio

Frequencies). For example, welding

equipment is known to produce a large

amount of radio interference. If screened

cable is required, you should keep to the

following guidelines:

1. Avoid earth loops by connecting the

screen on the cable to mains earth at

the control unit but not at the keypad or

expander.

2. The continuity of the cable screen is

most important and screens MUST be

continuous along the full length of the

cable.

3. Where the cable enters any metal

enclosure, ensure the screen is isolated

from the case.

Cable Segregation

Segregate the bus cabling from any other

wiring, such as mains supply cables,

telephone cables, computer network cables

and R.F. cables. Use cable ties to keep

cables separated.

Keep the bus cable clear of cables supplying

sounders, extension loudspeakers or any

other high current devices.

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