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This section contains explanations of fault messages associated with the SPS that may
appear on the 4100U-S1 display. Heading text in the left margin shows the error message,
while the paragraph next to it describes the likely cause of the message.
There is no output voltage from the power supply. Refer to Chapters 2 and 5 for
information on power supplies.
One or more extra devices, i.e., devices that have not been configured on the IDNet
channel, are on the system. Only one message appears, regardless of the number of extra
devices found.
There is an open circuit on the IDNet channel. A hardware reset of the system is required
to reset the fault.
Comes up during the Earth Fault Search diagnostic function. Once the search is initiated,
the front panel display indicates how far the search process has progressed (10%, 25%…
75%), and then shows the results of the search. The result either identifies the offending
circuit or indicates that the earth fault could not be found. SPS circuits (IDNet, NAC, and
aux power) are searched. System alarm and trouble processing is suspended during the
search.
Appears when a short circuit is detected on the IDNet channel. This status clears
automatically when the short circuit is removed.
Appears when at least one device on the IDNet channel has been configured, but no
devices are communicating on the channel. This message does not appear if there are no
configured devices on the IDNet channel.
Occurs when the 4100U-S1 is put into a diagnostic mode and finds a device not
responding, or responding unreliably.
Occurs when 24 V is not present on TrueAlarm devices or when TrueAlarm sensor bases
with relay driver outputs are not properly supervised or when isolator devices are in
isolation mode.
Troubleshooting an SPS
Overview
“IDNet Power
Monitor Trouble”
“Extra Device”
“Class A Trouble”
“Earth Fault Search”
“Short Circuit”
“Channel Fail”
“No Answer/
Bad Answer”
“Output Abnormal”