10 OF 12—FAN STATIC RESET KIT MKT-0266 MPC-1480 ©2010 Phoenix Controls Specifications subject to change without notice. Rev. 5/10
TROUBLESHOOTING
There is no signal input • Check for power between the red and black wires
• Power should be between 7 to 40 Vdc or 7 to 32 Vac
• If no voltage is present check power source at the controller and interconnecting
cable
• If voltage is present, disconnect all other devices from the controller to see if the
signal returns
• Disconnect the white signal wire going to the controller and using a volt meter,
check for a signal voltage
If the device has a proper power source and there is no output signal with all other
devices disconnected, it must be returned to the factory for replacement.
The output signal appears to be
incorrect
• With no differential pressure across the sensor, the output signal should be 0.25
Vdc ±0.06 Vdc
• Disconnect the tubing and connect a short piece of tubing across both the high
and low pressure ports to shunt the high and low to the same value. The voltage
output should be 0.25 Vdc
- If the signal is 0.25 Vdc but the pressure variable does not read 0, make
sure the scaling in the Configuration Plug-in indicates 0.25 Vdc = 0" W.C.
- If the zero output has shifted, there are no user adjustments on the sensor
itself so the Configuration Plug-in must be used to rescale the input voltage
(ex. 0.45 Vdc = 0" W.C.)
• With differential pressure across the sensor if you suspect the signal is reading
incorrectly
• There is no span adjustment on the pressure sensor. If a duct traverse indicates
there is an error, the only option is to use the Configuration Plug-in to adjust the
scaling of the input voltage range. For example, if 0" W.C. is at 0.45 Vdc and 5"
W.C. is at 4.75 Vdc, the Configuration Plug-in scaling needs to indicate 0.45
Vdc = 0" W.C. and 4.75 Vdc = 5" W.C.
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