Johnson Controls F4-CVM User Manual

Table 6: Troubleshooting
Problem Possible cause and correction Verification
Configurable output - analog
mode is invalid:
0–10 V output is set to 10–
100%, but 0 V is at output
terminals.
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.
Cause:
There is a power polarity
mismatch between the
connected device and the
configurable output.
Correction:
Ensure polarities of ~24 V COM/
OCOM match and that the
connected end device uses the
same polarity.
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.
The Common Reference is
incorrect.
Cause:
The OCOM terminal is not
connected.
Correction:
Connect the OCOM terminal of
the configurable output to the
common of the connected end
device.
1. Measure the output and
verify that it matches the
command.
2. Disconnect the connected
device and verify the
commanded value is
present.
29F4-CVM VAV Terminal Equipment Controllers Installation Instructions

Johnson Controls F4-CVM Specifications

General

Brand	Johnson Controls
Model	F4-CVM
Category	Controller
Language	English