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70
Part Two
Symptom
Possible Cause
Corrective Action
DIM always
displays 0.200
inches H
2
O.
Incorrect pressure
sensor output.
Pressure sensor must be set for 0-10 volt output, not 4–20 mA. Check
pressure sensor DIP switch 3 and make sure it is OFF (see Figure 10).
DIM does not
respond to RS-485
communications.
Network protocol is
incorrect.
Incorrect network
address.
Incompatible
software.
Go into
INTERFACE
menu,
NET PROTOCOL
item. The protocol
must match host system. Select correct interface.
The network address at the building automation system and at the DIM
must match. The network address must be unique for each DIM.
Data sent to DIM may be in form that the S
URE
F
LOW
controller cannot
recognize.
DIM displays
opposite pressure
signal.
Sensor direction is
incorrect.
Pressure sensor must have DIP switch correctly set for proper sign
display. Verify DIP switch 4 is ON when sensor is mounted in the
laboratory (controlled space), and OFF when sensor is mounted in
corridor (reference space). See Figure 8.
Alarm relays don't
work.
Alarms are turned
off.
Incorrect wiring.
Relay may be
defective.
Press
TEST
key. The individual alarm set points will display. If all
alarm set points are zero, alarm relay is not active, so relay will not be
required to change state.
Check the wiring from S
URE
F
LOW
relay's output to the device that is
connected to the relays.
Disconnect the DIM wiring from relay contact pins 13 and 14 for low
alarm relay and pins 25 and 26 for high alarm relay. Go into
DIAGNOSTICS
menu,
LOW ALM REL
or
HIGH ALM REL
.
Connect an ohmmeter to relay terminals to verify contact open and
closes. Press the
S
/
T
keys to manually trip the relay. If relay responds
(contact opens and closes), the device connected is incompatible or
defective. If relay doesn’t respond, relay is defective (may be caused
by incompatible device). Replace DIM.
"DATA ERROR"
flashing on display.
DIM was hit by
electrical
disturbance.
All data may be lost or changed. Review all configuration parameters.
DATA ERROR
is removed by pressing the
RESET
key.
Actuator hunting.
Display indicates
steady pressure.
Control system is
unstable.
Go into
CONTROL
menu,
SPEED
item. Turn speed down until
hunting is eliminated. If speed is too slow review
CONTROL
menu
items and adjust accordingly to eliminate hunting.