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Troubleshooting Guide
Controller is powered but does not turn on
Fuse has blown
Disconnect the power. Check the fuse integrity. Reconnect the power.
Power supply polarity
Verify that consistent polarity is maintained between all controllers and the transformer. Ensure that the 24VCOM terminal of
each controller is connected to the same terminal on the secondary side of the transformer. See
Power Wiring.
Controller cannot communicate on a BACnet MS/TP network
Absent or incorrect supply voltage
1. Check power supply voltage between 24VAC ±15% and 24VCOM pins and ensure that it is within 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).
Max Master parameter
Configure the maximum number of master device on the MS/TP network in all devices to the controller’s highest MAC
address used on the MS/TP trunk.
There is another controller with the same MAC
Address on the BACnet MS/TP data bus
Each controller on a BACnet MS/TP data bus must have a unique MAC Address. Look at the MAC Address DIP switch on
the faceplate or under the cover of the controller. If it is set to 0 (all off), use an Allure EC-Smart-Vue sensor to check the
MAC Address.
There is another controller with the same Device
ID on the BACnet intranetwork
Each controller on a BACnet intranetwork (the entire BACnet BAS network) must have a unique Device ID. Use an Allure
EC-Smart-Vue sensor to check the Device ID of each controller.
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
Network Guide.
Wire type
Check that the wire type agrees with the specification of the
Network Guide.
Network wiring problem
Double check that the wire connections are correct.
Absent or incorrect network termination
Check the network termination(s). Incorrect or broken termination(s) will make the communication integrity dependent upon
a controller’s position on the network.
Number of controllers on network segment
exceeded
The number of controllers on a channel should never exceed 50. Use a router or a repeater in accordance to the
Network
Guide.
Max Master parameter
Configure the maximum number of master device on the MS/TP network in all devices to the controller’s highest MAC
address used on the MS/TP trunk.
There is another controller with the same MAC
Address on the BACnet MS/TP data bus
Each controller on a BACnet MS/TP data bus must have a unique MAC Address. Look at the MAC Address DIP switch on
the faceplate or under the cover of the controller. If it is set to 0 (all off), use an Allure EC-Smart-Vue sensor to check the
MAC Address.
There is another controller with the same Device
ID on the BACnet intranetwork
Each controller on a BACnet intranetwork (the entire BACnet BAS network) must have a unique Device ID. Use an Allure
EC-Smart-Vue Series Communicating Sensor to check the Device ID of each controller.
I/O Extension Module cannot communicate on the subnetwork
Absent or incorrect supply voltage
1. Check power supply voltage between 24VAC ±15% and 24VCOM pins and ensure that it is within 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. See
Power Wiring.
Network not wired properly
Double check that the wire connections are correct.
There is another controller with the same Subnet
ID on the subnetwork
Each I/O Extension Module on the subnetwork must have a unique Subnet ID. Look at the Subnet ID DIP switch on the
faceplate of each I/O Extension Module.
Network length
Check that the total wire length does not exceed the specifications in the
Network Guide.
Wire type
Check that the wire type agrees with the specification of the
Network Guide.
Absent or incorrect network termination
Check the network termination(s). Only the last ECx-400 I/O Extension Module must have its EOL termination set to ON.
When one or more Allure EC-Smart-Vue sensors are connected to the controller, only the last sensor must have its EOL
termination set to ON. See the
Network Guidefor more information.
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.
Configuration problem
Using EC-gfxProgram, check the configuration of the input. Refer to the EC-gfxProgram user guide for more information.
Over-voltage or over-current at an input
An over-voltage or over-current at one input can affect the reading of other inputs. Respect the allowed voltage / current
range limits of all inputs. Consult the appropriate datasheet for the input range limits of this controller.
Open circuit or short circuit
Using a voltmeter, check the voltage on the input terminal. For example, for a digital input, a short circuit shows
approximately 0V DC and an open circuit shows approximately 5V DC.
Hardware output is not operating correctly
Fuse has blown (Auto reset fuse)
Disconnect the power and outputs terminals. Then wait a few seconds to allow the auto-reset fuse to cool down. Check the
power supply and the output wiring. Reconnect the power.
Output wiring problem
Check that the wiring is correct according to this manual and according to the peripheral device’s manufacturer.
Configuration problem
Using EC-gfxProgram, check the configuration of the input. Refer to the EC-gfxProgram user guide for more information.
