Distech Controls ECL/ECB-PTU Series User Manual page 113

Table 27: Troubleshooting ECB Device Symptoms
Symptom Possible Cause
The STATUS LED is The device has auto-
blinking diagnosed a fault con-
dition
Controller communi- Network length
cates well over a short
network, but does not
communicate on large
Wire type
network
Network wiring prob-
lem
Absent or incorrect
network termination
Number of controllers
on network segment
exceeded
Max Master parameter
Hardware input is not Input wiring problem
reading the correct
value
Open circuit or short
circuit
Configuration problem
Over-voltage or over-
current at an input
Hardware output is not Fuse has blown (Auto
operating correctly reset fuse, for 24V
controllers)
Output wiring problem
Configuration problem
0-10V output, 24VAC
powered actuator is
not moving
Network Guide
Solution
See Table 28 for a list of fault codes.
Check that the total wire length does not exceed the specifications of the Network
Guide. See Data Bus Physical Specifications and Cable Requirements
151.
Check that the wire type agrees with the specification of the Network Guide: See
Data Bus Physical Specifications and Cable Requirements
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
Deviceson page 148.
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.
net MS/TP Data Bus Token-Passing Overview
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 dig-
ital 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 appro-
priate 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-gfxProgram, check the configuration of the output; for example, is it
enabled? Refer to the EC-gfxProgram 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.
BACnet Troubleshooting
on page
on page 151.
BAC-
on page 165.
111