Cable And Wire Length Guidelines - Johnson Controls MS-FEC1611-1U Installation Instructions Manual

Table 3: FEC16 Terminal Blocks, Functions, Ratings, Requirements, and Cables
Terminal Block Terminal
Label Label
CONFIGURABLE OUTn
(Outputs)
OCOMn

Cable and Wire Length Guidelines

Table 4 defines cable length guidelines for the various wire sizes that may be used for wiring low-voltage (<30 V)
input and outputs.
Table 4: Cable Length Guidelines for Recommended Wire Sizes for Low-Voltage (<30 V) Inputs and Outputs
Guideline Wire Size/Gauge and Type
A 1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
B 1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
C See Figure 8
Use stranded copper wire
FEC1611 and FEC1621 Field Equipment Controller Installation Instructions
Function, Ratings, Requirements
Analog Output - Voltage Mode (0–10 VDC)
10 VDC maximum output voltage
10 mA maximum output current
Required an external load of 1,000 ohm or more.
Binary Output - 24 VAC Triac (External Power Source
only)
Connects OUTn to OCOMn when activated.
External Power Source Requirements:
30 VAC maximum output voltage
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
Analog Output Signal Common All Configurable Outputs
(COs) defined as Analog Outputs (AOs) share a common,
which is isolated from all other commons except the Binary
Input common.
Binary Output Signal Common All Configurable Outputs
(COs) defined as Binary Outputs are isolated from all other
commons, including other CO commons.
to select wire size/gauge.
Maximum Cable
Length and Type
457 m (1,500 ft) twisted
wire
297 m (975 ft) twisted wire
183 m (600 ft) twisted wire
107 m (350 ft) twisted wire
229 m (750 ft) twisted wire
137 m (450 ft) twisted wire
91 m (300 ft) twisted wire
61 m (200 ft) twisted wire
See Figure 8 to determine
cable length. Use twisted
wire cable.
Determine Wire Size and
Maximum Cable Length
See Guideline A in
See Guideline C in
Same as (Configurable) OUTn.
Assumptions
100 mV maximum voltage drop
Depending on cable and the connected input
or output device, you may have to define an
offset in the setup software for the input or
output point.
100 mV maximum voltage drop
Depending on cable and the connected input
or output device, you may have to define an
offset in the setup software for the input or
output point.
N/A
Table 4.
Table 4.
17