Note:
That some installations require the
secondary of the Transformer to be Earth
Grounded. If this is the case, verify that
the Earth Ground connection is valid and
not shared between multiple pieces of
equipment.
Configurable output - analog mode is invalid
0–10 V output is set to 10–100%, but 0 V is at output
terminals
and
Output is in protection mode -a state
the analog portion of the configurable output goes
into when it detects a wiring problem. The analog
output is set to 0% regardless of the command
whenever a wiring fault is detected.
Possible Cause:
Power polarity mismatch between
connected device and configurable output.
Correction:
Ensure polarities of ~24 V COM/OCOM
match and that the connected end device uses the
same polarity.
Verification:
1. Measure the output and verify that it matches
the command.
2. Disconnect the connected device and verify the
commanded value is present.
Configurable output - analog mode is invalid
0–10V output has an undesirable offset of up to 1 V
and
Common Reference is incorrect.
Possible Cause:
OCOM terminal is not connected.
Correction:
Connect OCOM terminal of the
configurable output to the common of the
connected end device.
Verification:
1. Measure the output and verify that it matches
the command.
2. Disconnect the connected device and verify the
commanded value is present.
LED status and states
Table 8: Status LEDs and description of LED states
LED label
LED color
Normal state
Descriptions of LED states
POWER
Green
On Steady
Off Steady = No power
On Steady = Power is supplied by primary voltage
FAULT
Red
Off Steady
Blink - 2 Hz = Download or startup in progress, not
ready for normal operation, SA Bus devices offline
(such as netsensors)
Rapid blink = SA Bus communications issue
Off Steady = No faults
On Steady = Device fault or no application loaded
FC BUS
Green
Blink - 2 Hz
Blink - 2 Hz = Data transmission (normal
communication)
Off Steady = No data transmission (auto baud in
progress)
On Steady = communication lost, waiting to join
communication ring
SA BUS
Green
Blink - 2 Hz
Blink - 2 Hz = Data transmission (normal
communication)
Off Steady = No data transmission (N/A - auto baud
not supported)
On Steady = Communication lost; waiting to join
communication ring
EOL
Amber
Off
On Steady = EOL is active
Off Steady = EOL is not active
VMA1615/1626/1628/1630 VAV Controllers Installation Guide
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