Satchwell IAC 600 - Wiring Precautions; Cable Lengths and Resistance Limits; Screening and Earthing Requirements; Low Voltage Wiring Precautions

Note 1: Where len
g
th exceeds fi
g
ures in column 2 up to a maximum of
300m select cable size to compl
y
with resistance in column 3
and use one of the followin
g
screenin
g
options:-
•
Screened cable. Earth screen at controller end onl
y
.
(
Terminal 2 is an earth terminal
)
Note 2: The Controller must have a verified
g
ood earth.
Note 3: The resistance between 2 and Earth must not exceed
0.5 ohm. Where several controllers are mounted in a
g
roup a
separate wire should be run from 1 to a common earth terminal
nearb
y
. Do not loop the terminal 2s to
g
ether in a chain.
Note 4: Do not run low Volta
g
e
(
24V or less
)
wirin
g
in same harness
as mains wirin
g
, in control panels.
Note 5: Do not switch 0V side of 24V power suppl
y
to the IAC.
Note 6: Maximum Suppl
y
Volta
g
e is 24Vac
±
10%. Maximum Volta
g
e
on terminals 6 and 7 is 10Vdc with respect to 0V. Do not
connect 230Vac to an
y
terminal.
Note 7: The 24Vac suppl
y
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
(
ad
j
ustable
)
DRT
(
non-ad
j
ustable
)
, DDT,
DWT, DST, DOT, DDU
Analo
g
ue 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
∼
Suppl
y
0–10V dc Si
g
nal
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 separatel
y
from an
y
other cables dc resistance <30 ohm per 300 metre
e.
g
. 24 AWG; 25 SWG
(
0.21mm
2
)
. Maximum
len
g
th 1000 metres
(
240 ohms max. dc loop
resistance
)
. Mutual capacitance <60 pF per metre.
Serial Link
to
Remotel
y
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