Troubleshooting - Johnson Controls EasyIO FS Series Quick Start Manual

Table 4: Micro SD card specifications
Specification
Class

Troubleshooting

Table 5: FS troubleshooting
Problem Cause
The controller does not •
turn on due to one of the •
following problems:
• The transformer
•
trips. Power is at
the transformer
primary and there
is no voltage at the
secondary.
• The breaker or fuse
trips. Power is at
transformer primary.
You find 24 V at
secondary and 0 V at
breaker or fuse.
Analog output mode is Load impedance is lower than 2,000 ohms.
invalid. 0 V to 10 V output
is set to 100%, but output
terminals are less than 10
V.
Analog mode for a The COM terminal is not connected.
configurable output is
invalid. For example, 0 V
to 10 V output results in
an unwanted offset of up
to 1 V.
The Common Reference
is incorrect.
14 FS-32 Quick Start Guide
The transformer shorted.
The 24 VAC powered sensor is not wired
with the same polarity as the controller.
The RS-485 bus device is not wired with
the same polarity as the controller.
Remark
Class 4
Class 10
Solution
1. Ensure that the polarity of ~24 V COM, +15 V COM, and SA
BUS COM on the controller, auxiliary devices, and input
and output devices is the same.
2. Verify that the short circuit is resolved with an ohm-meter.
3. Reset the breaker or fuse, or replace the transformer.
Note: If you replace the transformer, replace it
with a model that uses a resettable circuit breaker.
A circuit breaker makes it easier to solve wiring
problems.
4. To verify the connection, complete the following steps:
a. Disconnect the secondary of the 24 VAC transformer.
b. Use an ohm-meter to measure between ~24 V H and
G at the controller. Ensure that no short circuit occurs.
Note: If your installation requires that you
earth ground the transformer secondary,
verify that the earth ground connection is valid
and not shared between multiple pieces of
equipment.
1. Ensure that the voltage control device load impedance is
higher than 2,000 ohms. For more information, refer to
voltage device manufacturer specification.
2. Disconnect the connected device and verify that the value
you require is present.
1. Connect the COM terminal of the configurable output to
the common of the connected end device.
2. Measure the output and verify that it matches the
command.
3. Disconnect the connected device and verify the
commanded value is present.