Pressura RPM10 Operation And Service Manual page 78

Symptom Possible Cause
Alarm relays do Alarms are
not work. turned off.
Incorrect wiring.
Relay may be
defective.
Displayed room Supply air is
pressure or flow affecting the
wildly sensor.
fluctuating.
Display
averaging is
very short.
Monitor needs
calibration.
Analog output Monitor is
does not work connected to
properly. incompatible
equipment.
Displayed Pressure sensor
velocity does is dirty.
not match
Monitor is not
measured
calibrated.
velocity.
Monitor does Defective cable
not
communicate
with TSI
Configuration
Software
70
Corrective Action
Enter the Rm1 Alarm, AnteRm Alarm or Rm2 Alarm menu.
Verify that the Alarm Enable item is set to enable the high
or low alarms as desired.
Check the wiring from DIM relay output to the device that is
connected to the relays.
Disconnect the wiring (terminals 9 to 12) from relay
contacts. Go into DIAGNOSTICS menu, Relay Outputs
item. Connect an ohm-meter to relay terminals to verify
contact open and closes. Press the Relay1 Toggle or
Relay 2 Toggle button to manually trip the relay.

If relay responds (contact opens and closes), the
device connected is incompatible or defective.

If relay does not respond, relay is defective (may be
caused by incompatible device). Replace DIM.
Check location of supply air diffusers. They should be
located as far from the pressure sensor as is realistic,
10 feet preferred with 6 feet minimum. Supply diffuser
terminal throw velocity must be less than 10 ft/min at the
sensor. Relocate supply or exhaust as needed.
Lengthen the time constant by entering the
CONFIGURATION menu, DISPLAY AVG item, and
increase the average time.
Calibrate monitor.
Enter the DIAGNOSTICS menu, Analog Outpt item. Use
Output 1, Output 2 or Output 3 button to adjust the output.
Change the output value while measuring the output with a
multimeter. If the voltage (current) changes, the monitor is
functioning properly.
If the voltage (current) does not change, disconnect the
analog out device and repeat the above procedure. If
voltage now changes, the monitor is good, and the external
device is defective. If no change occurs, DIM is defective.
See Maintenance and Repair
See Calibration.
Replace cable with TSI P/N 700036
Parts.
Part Two