Planning the Installation
Page 14
Worked example
The following shows a simplified example of checking power availability.
Device
Current
Control unit PCB (i-on30R)
90mA
i-dig02 at 20mA
20mA
10 x PIRs at 15mA each
150mA
1 x wired expanders
20mA
2 x KEY_FKPZ at 25mA each (backlights off)
50mA
Siren (quiescent)
35mA
Total
365mA
During an alarm, the current consumptions are:
Device
Current
Control unit PCB (i-on30R)
90mA
i-dig02 at 50mA
50mA
10 x PIRs at 15mA each
150mA
1 x wired expanders
20mA
2 x KEY_FKPZ at 65mA each (in alarm)
130mA
Siren (in alarm)
225mA
Total
665mA
Since the control unit's power supply can provide 820mA, the above shows that the power
supply is able to power the system during an alarm (665mA).
The total amp-hours required for the battery for Grade 2 is:
(0.365A x 11.5h) + (0.665A x 0.5h) = 4.53Ah
A fully-charged, 7Ah battery can provide the charge required by the above example to
meet Grade 2 requirements.
Detector (zone) wiring types
Before installation, you need to choose the wiring type (method) to use for any wired
detectors: Fully-Supervised Loop (FSL), 4-wire Closed Circuit (CC), or 2-wire CC, as
described below.
The latest EXP-W10 wired expander allows you to mix FSL and 4-wire CC on the same
expander. Other devices, including the control unit itself, require you to use the same
wiring type for all wired detectors connected to the same device.
You will need to ensure that all detectors are wired correctly and that you select the default
wiring type during the initial power-up procedure (page 20). If necessary, you can edit the
wiring type for individual devices.
The wiring types are as follows.
Fully Supervised Loop (FSL)
This uses a single pair of wires for each detector, with resistors at the end of the line and
across the alarm contact (Figure 2). The resistors allow the system to monitor for short-
circuit or open-circuit conditions to guard against cable tampering.
