Honeywell Excel 800 SYSTEM Installation And Commissioning Instructions page 79

Excel 800
LED Test for I/O Modules (pluggable I/O modules, only)
Press the service button S1 of the pluggable I/O module, e.g. using a paperclip.
►
– The service LED and all other LEDs of that Panel Bus I/O module light up for as long as the service button is pressed.
LED
Power LED
Service LED
Analog output module status LEDs
Relay output module status LEDs
Digital input module status LEDs
Table 79 Effects of pressing and holding down service button of pluggable I/O modules
An LED is defective if it is not lit as shown above.
Analog Input Modules Troubleshooting
case Problem
1
Incorrect sensor
measurement
2
Unstable sensor
measurements
3 a voltage of about
8.88 V(*) is measured
(with an external volt-
meter) at an open analog
input configured for:
NTC20kΩ or
Pt1000-1/-2 or
Pt3000 or
Balco 500 or
NTC10kΩ or
NI1000TK5000.
4 a voltage of about
8.88 V(*) is measured
(with an external volt-
meter) at an open analog
input configured for:
0...10V with pull-up or
slow Digital Input
(*): voltage may differ slightly depending on the input impedance of the used voltmeter
Table 80 Failure modes of analog input modules
Correct behavior
ON continuously (if it flashes, check the 24 VAC power supply)
ON continuously
ON continuously
ON continuously
Red -> green -> yellow -> red -> green -> yellow, cyclically every 0.5 sec
Possible causes
Wrong sensor configuration
Incorrect wiring
Sensor failure
Negative voltage on at least one channel
Incorrect grounding of active sensors
Sensor is not connected
Normal value for open input that is configured
to listed types
79
Troubleshooting
Remedy
Reconfigure sensor
►
Rewire
►
Replace sensor
►
Check polarity of active sensor
►
inputs.
Ground active sensors individually
►
(see Fig. 64 and Fig. 65 on page 42
and following)
Connect the configured sensor
►
No action necessary
►
EN1B-0375GE51 R0910