Cable And Wire Length Guidelines - Johnson Controls Metasys FEC Series Installation Manual

Table 2: FEC16 terminal blocks, functions, ratings, requirements, and cables
Terminal
Terminal block label
label
OUTn
BINARY
(Output)
Power Selection Jumper
positioned to Internal
OCOMn
(INT) power.
OUTn
CONFIGURABLE
(Outputs)
OCOMn

Cable and wire length guidelines

The table below defines cable length guidelines for the
various wire sizes that may be used for wiring low-voltage
(<30 V) input and outputs.
Table 3: Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs
Guideline Wire size/Gauge and type
1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
A
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
B
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
Function, ratings, requirements
Binary Output - 24 VAC Triac (Internal Power Source)
Model FEC1611-0: Sources internal 24 VAC power (24~ COM).
Model FEC1611-1: Sources internal 24 VAC power (24~ HOT).
Binary Output - 24 VAC Triac (Internal Power Source)
Model FEC1611-0: Connects OCOMn to 24~ HOT when
activated.
Model FEC1611-1: Connects OCOMn to 24~ COM when
activated.
Internal Power Source:
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 - 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.
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
Metasys System FEC1611 and FEC1621 Field Equipment Controller Installation Guide
Determine wire size and
maximum cable length
See Guideline C in Table 3.
See Guideline A in Table 3.
See Guideline C in Table 3.
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.
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