EXCEL 50 INSTALLATION INSTRUCTIONS
13
EN1B-0101
Cabling
Cable Routing
All signal (input/output, low voltage) cables are communi-
cation circuits in accordance with VDE 0100, VDE 0800 and
local regulations and should therefore be routed separately
from line voltage.
Table 5. Minimum Distances to Line Voltage.
Cable Type
Minimum Distance
unshielded cable
4 in. (100 mm)
shielded cable
3/8 in. (10 mm)
IMPORTANT
Avoid joining sensor cables.
Shielding
Fig. 21. Sensor shielding.
Shielding of sensor and actuator cables with low protective
voltages is not necessary if the general guidelines on cable
routing are observed (see "Cable Routing", page 13). If these
guidelines cannot be observed, shielded cable must always
be used. The shielded cable must be grounded as is shown
in Fig. 21.
IMPORTANT
Shielding of I/O cables that are connected to
peripherals such as sensors and actuators must be
grounded at the control cabinet side only in order to
avoid ground loops.
All Honeywell actuators are RFI suppressed in accordance
with VDE 0871/B and VDE 0875/N.
Lightning Protection
Please check with your local Honeywell representative for
information on lightning protection.
Cable Lengths and Cross Sectional Areas
Table 6. Signal types and cross-sectional areas.
Cross-sectional area
Type of signal
≤≤≤≤
300 ft
(100 m)
≤≤≤≤
550 ft
(170 m)
≤≤≤≤
1,300 ft
(400 m)
Power supply
(24 Vac)
≤
16 AWG
(
≥
1.5 mm
2
)
≤
14 AWG
(
≥
2.5 mm
2
)
-
Low-current
signals*
≤
20 AWG (
≥
0.5 mm
2
)
*E.g. for 0-10 V sensors, totalizers, digital inputs, 0-10 V
signals for actuators.
IMPORTANT
The maximum length of a signal cable with 24 Vac
supply is 550 ft (170 m). The maximum length of a
two-wire, 0 to 10 Vdc signal cable is 1,300 ft
(400 m). The secondary side of the transformer must
not be connected to earth ground.
TRANSFORMER
MAX. 550 ft (170 m)
MIN. 14 AWG (2.5 mm )
2
PRIMARY
VOLTAGE
Y
GND
24 Vac
2
24 V
1
00
00
05
6b
Fig. 22. Cabling of actuator with 24 Vac supply and
max. 550 ft (170 m).
If the distance between the controller and actuator or sensor
with 24 Vac supply is greater than 550 ft (170 m), a separate
external transformer for the actuator or sensor is necessary.
TRANSFORMER
EXTERNAL
TRANSFORMER
PRIMARY
VOLTAGE
MAX. 1300 ft (400 m)
MIN.20 AWG (0.5 mm )
2
24 Vac
230 Vac
120 Vac
230 Vac
120 Vac
0 TO 10 Vdc
GND
PRIMARY
VOLTAGE
24 Vac
0
000
00
57d
2
1
Fig. 23. Cabling of actuator with 24 Vac supply from
external transformer and max. 1,300 ft (400 m).
IMPORTANT
We recommend installing a fuse on the secondary
side of the transformer in order to protect the devices
against miswiring.
