TSI Instruments PRESSURA 8630-SM - Troubleshooting Chart

Technical Section 33
Troubleshooting Chart
Symptom
Possible Cause
Corrective Action
Display is blank.
Fuse is blown.
No power to DIM.
DIM is defective.
Measure voltage at pins 1 and 2 on DIM.
The voltage should nominally be 24 - 30 VAC.
If correct voltage is measured, internal DIM fuse is
probably blown. Unplug 14-pin connector from DIM for 2
minutes. The internal fuse will automatically reset. Plug
unit back in and check display. If display is still blank,
check all wiring, etc. If no problems are found, replace
DIM.
If zero volts are measured, see No power to DIM.
Wiring is incorrect. Check all wiring. If separate
transformer is not installed for each system, double
check polarity and for ground loops.
Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
Verify voltage on pins 1 and 2 of DIM is 24 to 30 VAC.
If proper voltage is found between pins 1 and 2 of the
DIM, all wiring has been checked, fuses have been
reset, and screen is still blank, the DIM is probably
defective. Replace DIM.
Pressure sensor
red LED is
blinking
(Figure 9).
Problem with
sensor (slow
uniform blink).
Communication
(fast burst of
non-uniform
blinking).
Red LED is on
constantly.
Sensor
communications
not working.
Check SENSOR STAT and confirm NORMAL is
displayed. If ERROR is displayed, correct error.
Unit is communicating with DIM. This is normal.
This is normal when no problems exist or when
communication is occurring.
Check SENSOR STAT item in diagnostics menu. If
NORMAL is displayed, sensor is okay, if COMM
ERROR is displayed, check wiring, pressure sensor
address, and that DIP switch 1 & 2 are ON (Figure 9).
DIM always
displays 0.200
inches H
2
O.
Incorrect pressure
sensor output.
Pressure sensor must be set for 0 to 10 volt output, not
4 to 20 mA. (do not confuse this output with DIM analog
output). Check pressure sensor DIP switch 3 and make
sure it is OFF. (See Figure 9).