Table of Contents
Advertisement
Diagnostics
input 1 on the Tracer ZN controller (polarity
sensitivity).
•
The mini-access lid on the front of the main control
panel lid has the ECM engine troubleshooting/setup
guide affixed to the back of the lid. This guide is unit-
specific and should be consulted before determining
the disposition of a unit.
General Information (ECM)
The ECM engine oversees and monitors all motor
operations and changes to speed resulting from:
•
Direct Fan Speed Requests
– Customer Fan Speed Switches
– Thermostat Fan Speed, On or 0–10V requests
– Automatic Fan Request from Tracer ZN / UC
controllers
•
Indirect Fan Speed Requests
– Electric Heat requests will bring the fan to the
proper speed.
•
Conflicting Fan Speed Requests
– If two or more commands are received (direct or
indirect), the fan will honor the higher speed
requested.
Note: In some cases, indirect requests will result in fan
behavior change regardless of whether the end-
device fails to actuate (due to device failure, or
safety/down-stream lockouts).
The ECM engine board also coordinates the operation of
Electric Heat, Electric/Hydronic Heat lockouts, and CSTI
Changeover coil operation.
Troubleshooting Information (ECM)
General system troubleshooting tips (ECM)
•
ECM engine configuration must perfectly match the
factory-supplied ECM.
– Refer to
"ECM Overview and Setup, " p. 43
troubleshooting configuration of the engine board.
•
The ECM engine will display troubleshooting
information, and contains dual tachometers to aid in
performance verification.
•
Under normal circumstances, the ECM engine display
will display the operational status of the motors and
electric heat circuit/sensors, however, a malfunction
will drive a priority display mode that will present the
error code instantly to the screen. The error must be
cleared by solving by powering down, removing the
cause of the problem and restarting the engine board.
•
Engine Label setup document (affixed to the back of the
low voltage access lid) should be used to verify engine
configuration settings.
•
For proper operation of the system, all plugs must be
firmly seated in all boards and motors. Insecure
104
connections will cause malfunction and the system
will shutdown.
•
Do not unplug or plug-in motors or connectors while
the system is receiving a speed request of any kind.
The system must be powered down before plugging or
un-plugging connections to the adapter boards,
engine boards or motors. Failure do so will register
diagnostics or cause unsafe operation and reduction in
the contact life of the connectors.
•
The motor will not spin if plugged in while the ECM
engine is requesting power.
Troubleshooting a motor that does not spin,
or spins too slowly (ECM)
The motor connections and motor plug connections to the
adapter boards should be secure. Unit should be powered
off to check the fit of the connectors.
When configured correctly, the system will always
respond positively to direct, indirect, and conflicting speed
requests with very few exceptions:
These exceptions are:
1. If a motor has been locked out due to engine locked
rotor protection:
– Assuming Motor 1 has an obstruction. In this case,
the "Status Display" will be interrupted to display:
Solution:
i. Remove obstruction from the fan wheel.
ii. Ensure that motor plugs and all plugs to adapter
boards and the ECM engine board are secure
iii. Verify that the configuration does not specify a
motor that is physically missing. Most units
require only one motor. The controller is made
aware of the missing motor by specifying all
speeds related to Motor 2 to 0 rpm.
iv. Verify that
for
signal output limits, are set correctly.
2. If a motor has been locked out due to overspeed or
runaway condition:
– Assuming Motor 1 has an overspeed condition. In
this case, the "Status Display" will be interrupted to
display:
Solution:
i. Ensure that set-screw is attached firmly to the
motor shaft.
ii. Ensure that motor plugs and all plugs to adapter
boards and the ECM engine board are secure.
iii. Verify that the configuration does not specify a
speed lower than 450 rpm for the affected motor.
Speeds below 450 rpm are not supported on fan-
coil units.
→
→
and
, the low motor
→
→
UV-SVN02C-EN
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
