Distech Controls ECB-VAV, User Manual

Page: 113 / 138

BACnet Troubleshooting
Network Guide 111
The STATUS LED is
blinking The device has auto-
diagnosed a fault con-
dition See Table 28 for a list of fault codes.
Controller communi-
cates 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. See
Data Bus Physical Specifications and Cable Requirements on page
151.
Wire type Check that the wire type agrees with the specification of the Network Guide: See
Data Bus Physical Specifications and Cable Requirements on page 151.
Network wiring prob-
lem 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: See
Data Bus Segment MAC Address Range for BACnet MS/TP
Devices on page 148.
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.
BAC-
net MS/TP Data Bus Token-Passing Overview on page 165.
Hardware input is not
reading the correct
value Input wiring problem Check that the wiring is correct according to the module's hardware installation
manual and according to the peripheral device's manufacturer recommendations.
Open circuit or short
circuit Using a voltmeter, check the voltage on the input terminal. For example, for a dig-
ital input, a short circuit shows approximately 0V and an open circuit shows
approximately 5V. Correct wiring if at fault.
Configuration problem Using the controller configuration wizard, check the configuration of the input.
Refer to the controller's 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 appro-
priate datasheet for controller input range limits.
Hardware output is not
operating correctly Fuse has blown (Auto
reset fuse, for 24V
controllers) 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 the module's hardware installation
manual and according to the peripheral device's manufacturer.
Configuration problem 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.
0-10V output, 24VAC
powered actuator is
not moving Check the polarity of the 24VAC power supply connected to the actuator while
connected to the controller. Reverse the 24VAC wire if necessary.
Table 27: Troubleshooting ECB Device Symptoms
Symptom Possible Cause Solution