Daikin MPS040 F - Page 52

Table 26: Transmitter Troubleshooting
Problem Possible Cause Remedy
The host control system is unable to communicate
with the transmitter.
Output card is not securely mounted on main circuit
board.
Turn the transmitter power "OFF" and press the
output card rmly onto main circuit board. Turn the
transmitter power back "ON".
Network signal wiring is not properly connected to the
transmitter or the host controls.
Verify that the network signal wires from the host
controls are connected to the proper terminals of the
OUTPUT block. On the transmitter OUTPUT terminal
block, NET+ is for A, NET- is for B and COM for
common.
Network protocol is not properly set on the transmitter.
Set network protocol based on the network
requirements and reset transmitter power.
Network address is not properly set on the transmitter.
Set address based on network requirements and
reset transmitter power. The address must be unique
for the network.
Network termination is not properly set on the
transmitter.
Set transmitter termination based on network
requirements and reset the transmitter power.
The LCD display does not match the readings
indicated by the host control system.
The Area or K factor of the transmitter does not match
that of the host controls.
Compare the value of the Area or K factor of the
transmitter with that of the host control system and
make adjustments to ensure a match.
The returned value for airow is zero when airow is
indicated on the LCD display of the transmitter.
The Low Limit airow cutoff value is above the actual
airow reading.
Decrease the Low Limit airow cutoff value in the
Setup menu until it is below the actual airow reading.
The status point from the transmitter has a Trouble
value.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe's hang tag.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
There is no value for the differential pressure point
Differential pressure is only available from transmitters
that have a Bi-directional Bleed Airow Sensors
connected.
If a differential pressure measurement is required,
contact your local Daikin Representative about a Bi-
directional Bleed Airow Sensor.
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