10 PROGRAMMABLE CONTROL MODULE: LONMARK MKT-0244 MPC-1673 ©2009 Phoenix Controls. Specifications subject to change without notice. Rev. 11/11
TROUBLESHOOTING
Problem Solutions
Controller is powered but does not turn on
Fuse has blown (Auto-reset fuse) Disconnect the power, the input and the output terminals. Then wait a few
seconds to allow the auto-reset fuse to cool down. Check the power supply and
check input and output wiring. Reconnect the power.
Power supply polarity Verify that consistent polarity is maintained between all controllers and the
transformer. Ensure that the COM terminal of each controller is connected to the
same terminal on the secondary side of the transformer.
Controller cannot communicate on a FTT network
Absent or incorrect supply voltage 1. Check power supply voltage between 24 Vac/dc ±15% and COM pins, and
ensure that it is between acceptable limits.
2. Check for tripped fuse or circuit breaker.
Overloaded power transformer Verify that the transformer used is powerful enough to supply all controllers.
Network not wired properly Double check that the wire connections are correct.
Absent or incorrect network termination Check the network termination(s).
Incorrect APB/NXE file has been loaded
Use the memory erase jumper to reset the Neuron chip's memory, then load the
proper APB or NXE into the controller using LonMaker.
Service pin not working
Controller communicates well over a short network, but does not communicate on large network
Network length Check that the total wire length does not exceed the specifications of the Junction
Box and Wiring Guideline for Twisted Pair LonWorks Networks.
Wire type Check that the wire type agrees with the specification of the Junction Box and
Wiring Guideline for Twisted Pair LonWorks Networks.
Network wiring problem Double check that the wire connections are correct.
Absent or incorrect network termination Check the termination(s). Incorrect or broken termination(s) will make the
communication integrity dependent upon a controller's position on the network.
Extra capacitance Make sure that no extra capacitance is being connected to the network other than
the standard FTT circuit, and a maximum of a 3 meter stub (in bus topology).
Number of devices on network segment exceeded The number of controllers on a channel should never exceed 64. Use a router or
a repeater in accordance to the Junction Box and Wiring Guideline for Twisted
Pair LonWorks Networks.
Network traffic Query node statistic to check errors.
Use a LON protocol analyzer to check network traffic.
Hardware input is not reading the correct value
Input wiring problem Check that the wiring is correct according to this manual and according to the
peripheral device's manufacturer.
Open circuit or short circuit Using a voltmeter, check the voltage on the input terminal. Short circuit (0 V) and
Open circuit (5 V).
Configuration problem Using the controller configuration plug-in or wizard, check the configuration of the
input. Refer to the controller's user guide for more information.
Hardware output is not operating correctly
Output wiring problem Check that the wiring is correct according to this manual and according to the
peripheral device's manufacturer.
Configuration problem Using the controller configuration plug-in, check the configuration of the input.
Refer to the controller's user guide for more information.
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