Distech Controls ECLYPSE APEX User Manual page 165

Symptom Possible Cause
The device has auto-
The STATUS LED is
diagnosed a fault
blinking
condition
Network length
Wire type
Network wiring
Controller
problem
communicates well over
a short network BACnet
Absent or incorrect
MS/TP network, but
network termination
does not communicate
on large network
Number of controllers
on network segment
exceeded
Max Master parameter
Input wiring problem
Open circuit or short
Hardware input is not
circuit
reading the correct
value
Configuration problem
Over-voltage or over-
current at an input
Fuse has blown (Auto
reset fuse, for 24V
controllers)
Output wiring problem
Hardware output is not
operating correctly
Configuration problem
0-10V output, 24VAC
powered actuator is
not moving
Table 31: Troubleshooting Controller Symptoms
ECB Device LED In- Description
terpretation
Data is not being received from the BACnet
RX LED not blinking
MS/TP data bus.
Data is not being transmitted onto the BACnet
TX LED not blinking
MS/TP data bus.
Power is available at the device. However, this
does not mean that the quality of supplied
POWER constant on power is good. See Power Supply
Requirements for 24VAC-Powered Controllers
on page 163.
STATUS blinking See following table.
Table 32: LED Fault Condition Interpretation for ECB Devices
ECLYPSE APEX
Solution
See LED Fault Condition Interpretation for ECB Devices
codes.
Check that the total wire length does not exceed the specifications of the
Network Guide. See Data Bus Physical Specifications and Cable
Requirements.
Check that the wire type agrees with the specification of the Network Guide:
See Data Bus Physical Specifications and Cable
Double check that the wire connections are correct.
Check the network termination(s). Incorrect or broken termination(s) will
make the communication integrity dependent upon a controller's position on
the network.
The number of controllers on a channel should never exceed 50. Use a
router or a repeater: See Data Bus Segment MAC Address Range for BACnet
MS/TP Devices.
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.
See BACnet MS/TP Data Bus Token-Passing
Check that the wiring is correct according to the module's hardware
installation manual and according to the peripheral device's manufacturer
recommendations.
Using a voltmeter, check the voltage on the input terminal. For example, for
a digital input, a short circuit shows approximately 0V and an open circuit
shows approximately 5V. Correct wiring if at fault.
Using the controller configuration wizard, check the configuration of the
input. Refer to the controller's user guide for more information.
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 controller input range limits.
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.
Check that the wiring is correct according to the module's hardware
installation manual and according to the peripheral device's manufacturer.
With EC- gfx Program, check the configuration of the output; for example, is it
enabled? Refer to the EC- gfx Program User Guide for more information.
Check the polarity of the 24VAC power supply connected to the actuator
while connected to the controller. Reverse the 24VAC wire if necessary.
Solution
If there is no communication, see
Controller
If not lit, see
24VAC-Powered Controllers
requirements.
-
ECY Controller Troubleshooting
for a list of fault
Requirements.
Overview.
Troubleshooting
Symptoms.
Power Supply Requirements for
for the power
165