User Manual

Service and Fault Messages
Sensor Failure Handling
24
Siemens Industry, Inc.
Application Note, App 14901
140-1230
2020-02-11
Service and Fault Messages
All of the three counters for the Service UV Lamp, Service Humidifier and Service Air
Filter are tied to the fan running and are based on calendar days.
● Service UV Lamp (SrvcUvLamp):
The UV Lamp counter keeps track of the run-time of the fan calendar days since
the UV Lamp service reminder was last acknowledged/cleared. The UV Lamp
Service reminder is triggered when the counter reaches the value set in the Service
UV Lamp parameter. The counter is reset while acknowledging/clearing the UV
Lamp service reminder.
● Service Humidifier (SrvcHmdy):
The Humidifier counter keeps track of the run-time of the fan calendar days since
the Humidifier service reminder was last acknowledged/cleared. The Humidifier
service reminder is triggered when the counter reaches the value set in the Service
Humidifier parameter. The counter is reset while acknowledging/clearing the
Humidifier service reminder.
● Service Air Filter (SrvcFilter):
The Air Filter counter keeps track of the run-time of the fan calendar days since the
Air Filter service reminder was last acknowledged/cleared. The Air Filter service
reminder is triggered when the counter reaches the value set in the Service Air
Filter parameter. The counter is reset while acknowledging/clearing the Air Filter
service reminder.
Sensor Failure Handling
● Failure of external temperature sensor:
Stop control - manual change to internal sensor required
Control to onboard sensor, and activate SERVICE REQUIRED segment. Help text
displays SNSR X FAIL.
● Failure of external humidity sensor:
Control to onboard sensor, and activate SERVICE REQUIRED segment. Help text
displays SNSR X FAIL.
● Failure of onboard temperature sensor:
Stop control and displays FAILURE.
● Failure of onboard humidity sensor:
Stop humidity control and activate SERVICE REQUIRED segment. Help text
displays HUM FAIL.
● Failure of external CO2 sensor:
Stop Air Quality control and activate SERVICE REQUIRED segment. Help text
displays SNSR X FAIL.
I/O Test Mode
Certain expert menus, such as the P500 Series and P900 Series, can disrupt the
normal operation and force the unit into Test mode, releasing all of the outputs.
Under the P900 Series menu, the outputs can be overridden by I/O test function and
no minimum on/off timers are enforced.
After exiting the P500 Series and P900 Series menus, the unit goes back to normal
operation from the Test mode, enforcing all minimum off timers first and then restarting
all primary and secondary logic.