Johnson Controls VMA1930, Руководство по установке, Страница: 10 / 20

Table 3: 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 4.
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 4.
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 .
Cable and wire length guidelines
The following table 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
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
0.5mm (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 Maximum cable length versus
load current to select wire size/
gauge.
Use stranded copper wire.
See Maximum cable length
versus load current to determine
cable length.
Use twisted wire cable.
N/A
VMA1930 VAV Controller Installation Guide 10