Satchwell IAC 600, Manual

Page: 22 / 24

Note 1: Where length exceeds figures in column 2 up to a maximum of
300m select cable size to comply with resistance in column 3
and use one of the following screening options:-
•
Screened cable. Earth screen at controller end only.
(Terminal 2 is an earth terminal)
Note 2: The Controller must have a verified good earth.
Note 3: The resistance between 2 and Earth must not exceed
0.5 ohm. Where several controllers are mounted in a group a
separate wire should be run from 1 to a common earth terminal
nearby. Do not loop the terminal 2s together in a chain.
Note 4: Do not run low Voltage (24V or less) wiring in same harness
as mains wiring, in control panels.
Note 5: Do not switch 0V side of 24V power supply to the IAC.
Note 6: Maximum Supply Voltage is 24Vac
±
10%. Maximum Voltage
on terminals 6 and 7 is 10Vdc with respect to 0V. Do not
connect 230Vac to any terminal.
Note 7: The 24Vac supply must be fused with a 2A fuse.
IMPORTANT: Low voltage unscreened signal wiring must be run
in a separate loom or trunk from any mains wiring and spaced
as far as possible away from it (230Vac 45cm min, 415Vac 58cm
min, both Voltages are with respect to earth and a maximum
current of 15A). For other Voltages/currents refer to the IEE
report titled "Electro Magnetic Interference" September 1987
(ISBN85296353X).
WIRING PRECAUTIONS
Wiring from IAC
controller to: Maximum length
for 1.5mm
2
core
unscreened cable
Maximum
resistance
per conductor
Sensors
DRT (adjustable)
DRT (non-adjustable), DDT,
DWT, DST, DOT, DDU
Analogue inputs
100m
100m
100m
100m 10
Ω
15
Ω
15
Ω
15
Ω
Remote Setting Units
RPW
100m 10
Ω
Actuators
AVU, ADU
ALX, ALXS, ARX, AVUX, ARUX
ALE, ALES, ARE, ARES,
AVUE, ARUE
24V
∼
Supply
0–10V dc Signal
50m
100m
100m
100m
1
Ω
5
Ω
3
Ω
50
Ω
Triac Outputs 100m 3
Ω
Relays, time switches,
override contacts etc.
100m 5
Ω
Serial Link
(terminals 10–11,
12–13)
to EIA
Standard
RS 422/485
Twisted pair screened, run separately from any
other cables dc resistance <30 ohm per 300 metre
e.g. 24 AWG; 25 SWG (0.21mm
2
). Maximum
length 1000 metres (240 ohms max. dc loop
resistance). Mutual capacitance <60 pF per metre.
Serial Link to
Remotely Mounted
Touch-screen Four core twisted pair screened cable,
specification as above. Maximum cable run from
computer/MIU via the IAC 600 base to the
Touch-screen is 1000 metres. Touch-screen
Adaptor Kit (565-2-601) MUST be used.
DS 2.951A 22 - 24 05/98