Troubleshooting Excel 800
EN1B-0375GE51 R0910
80
Analog Output Modules Troubleshooting
case Problem Possible causes Remedy
Manual override settings
► Check manual override settings
Outputs are in safety position
► Check communication
Software problem
► Power down and then power up
► If problem persists, replace hardware
1
All outputs always have
zero voltage
Internal undervoltage detection has been
activated
► Replace hardware
2
Unstable output voltage
Incorrect grounding of actuators
► Ground actuators individually (see
Fig. 69 on page 46)
Table 81 Failure modes of analog output modules
Binary Input Modules Troubleshooting
case Problem Possible causes Remedy
1
Unexpectedly, all status
LEDs are always OFF
Internal overload protection has been
activated
► Power down and then power up
Table 82 Failure modes of binary input modules
Relay Output Modules Troubleshooting
case Problem Possible causes Remedy
Improper manual override settings
► Check manual override settings
Outputs are in safety position
► Check communication
Software problem
► Power down and then power up
► If problem persists, replace hardware
1
Unexpectedly, all outputs
are in unpowered position
Internal undervoltage detection has been
activated
► Replace hardware
Table 83 Failure modes of relay output modules
Floating Output Modules Troubleshooting
case Problem Possible causes Remedy
Improper manual override settings
► Check manual override settings to
check outputs
Outputs are in safety position
► Check communication
Software problem
► Power down and then power up
► If problem persists, replace hardware
1
Unexpectedly, all outputs
are in unpowered position
Internal undervoltage detection has been
activated
► Replace hardware
Table 84 Failure modes of floating output modules
A “Frequently Asked Questions and Troubleshooting” document is available via the Honeywell Technical Assistance Center
(TAC) or, for Honeywell employees, on the Intranet under:
http://web.ge51.honeywell.de/tac
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