Honeywell CM4 Technical Handbook page 121

CM4 Four-Point Continuous Monitor
Fault
Description
No.
Relay xx Fail
18
Overtemp
19
Customer I/O 24V Fail
20
High Pyro Flow PTx
21
Measurement and Control Board Fail Measurement and control board
22
Optics Shift PTx
23
24 Optics Verification Fail PTx
Pos Pressure PTx
25
CM4 Technical Manual
Possible Cause
Cable problem
Customer I/O relay board
Circuit board
Pyrolyzer or Optics Block-related
malfunction
Blown Fuse
Unconnected cable
Sample flow exceeds 200 cc/min
disconnected
Defective Measurement and Control board
Shift in optic light source
Verification card or Optics dirty
Flow detected with pump off. Possibly
induced by positive pressure at sample
point
Table B-1: CM4 Fault Listings (cont'd)
Corrective Action
Check cable to customer I/O board
Replace I/O relay board
Replace controller board
Check for dirty air filters
Call Local Service Agent
Replace fuse
Check cable connections
Perform Checking Flow Rates (Section
Check Connections to Measurement and Control board
Replace Measurement and Control board
Check optics
Clean card and repeat Verification Clean Optics
Point valve option should be installed
B-4
Beeping
Relay
Audio
Activated
Alarm
FAULT
(RY10)
and On
FAULT
(RY8)
FAULT
On
(RY10)
FAULT
On
(RY10)
9.2.5) FAULT
Off
(RY10)
FAULT
On
(RY10)
MAINT
Off
(RY8)
(Section 9.5) None Off
FAULT
On
(RY10)
Yellow
Status
LEDs
Solid
Solid
Solid
Pulsed
Solid
Off
Off
Solid