Johnson Controls VMA1615, Installation Manual

Page: 10 / 22

Table 2: I/O terminal blocks, functions, ratings, requirements, and cables
Terminal block label Terminal labels Function, ratings, and requirements
To determine wire size and maximum
cable length
Analog Output - Voltage Mode (0–10 VDC)
10 VDC maximum output voltage
10 mA maximum output current
External 1k to 50k ohm load required
See Guideline A in Table 3.
OUT n
Binary Output 24 VAC Triac
Connects OUT to OCOM when activated.
External Power Source:
30 VAC maximum voltage to load
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
See Guideline C in Table 3.
Analog Output Signal Common : All
Configurable Outputs defined as Analog
Outputs share a common, which is isolated
from all other commons except the Binary
Input common.
CONFIGURABLE
(Outputs)
OCOM n
Binary Output Signal Common : All
Configurable Outputs defined as Binary
Outputs are isolated from all other commons,
including other Configurable Output
commons.
Same as (Configurable)
OUT n
.
Table 3: Cable Length Guidelines for Recommended Wire Sizes
Guideline Wire Size/Gauge and Type
Maximum Cable Length and
Type
Assumptions
1.0 mm (18 AWG) stranded copper 457 m (1,500 ft) twisted wire
0.8 mm (20 AWG) stranded copper
297 m (975 ft) twisted wire
297 m (975 ft) twisted wire
0.6 mm (22 AWG) stranded copper
183 m (600 ft) twisted wire
183 m (600 ft) twisted wire
A
0.5mm (24 AWG) stranded copper
107 m (350 ft) twisted wire
107 m (350 ft) twisted wire
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have
to define an offset in the setup
software for the input or output
point.
1.0 mm (18 AWG) stranded copper 229 m (750 ft) twisted wire
0.8 mm (20 AWG) stranded copper
297 m (975 ft) twisted wire
137 m (450 ft) twisted wire
0.6 mm (22 AWG) stranded copper
183 m (600 ft) twisted wire
91 m (300 ft) twisted wire
B
0.5 mm (24 AWG) stranded copper
107 m (350 ft) twisted wire
61 m (200 ft) twisted wire
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have
to define an offset in the setup
software for the input or output
point.
C
See Figure to select wire size/gauge.
Use stranded copper wire.
See Figure to determine cable
length.
Use twisted wire cable.
N/A
Maximum cable length versus load
current
Use Figure 8 to estimate the maximum cable length
relative to the wire size and the load current (in mA)
when wiring inputs and outputs.
VMA1615/1626/1628/1630 VAV Controllers Installation Guide 10