ULB PROPRIETARY RIGHTS NOTICE
- This document contains the confidential and proprietary information of ULB. You may not possess,
use, copy or disclose this document or any information in it for any purpose without express written permission. Neither receipt from any source,
nor possession of this document, constitutes such permission. Possession, use, copying or disclosure by anyone without express written
permission of ULB is not authorized and may result in criminal and/or civil liability.
U:\ILB\5_Technical Manual\TLB-R1000-480-OS_NO ALL\TLB-R1000_480_MANUAL_Rev03.docx
Page
32
of
35
Troubleshooting
1) No Main Power to 120 VAC Control Circuits.
Emergency Stop / “E-STOP” push button is in the pressed position.
Terminals damaged during shipment.
External Control Power Main Switch or circuit breaker is not closed.
Control Power Transformer failure (primary or secondary control power fuse is blown (check
and replace as required).
Control Circuit Fuse is blown (check and replace as required).
Dirty or loose connections or faulty Main Power Switch.
2) Blower Motor Not Operating.
No External Power to Motor Circuits.
Main Power switch is in the off position.
Emergency Stop / “E-STOP” push button is in the pressed position.
External Blower/Control Power Main Switch or circuit breaker is not closed or power source is
disconnected.
Blower Motor is internally wired to main input load bus with no main input load bus voltage
applied.
External power source is inadequate.
Loose or broken connection at terminal block, motor starter, motor starting coil or on operator
control unit (main power, blower start/stop pushbuttons)
Blower Motor fuse is blown (check and replace as required).
Motor Over-Load relay is tripped.
Motor starting relay failed.
Fan blade obstruction, motor winding failure, or shaft does not turn to improper lubrication
3) Blower Motor Circuit energized but Fan Blade is not turning.
Fan blade motion is obstructed or broken.
Fan blade is loose at hub or is not keyed properly.
4) Air Failure fault indication on HMI display.
Obstruction or restriction of air flow at Load Bank cold-air intake or hot-air exhaust.
Blower motor phasing is incorrect causing rotation of fan blade and wrong direction of cooling
air flow. Check motor power connections for proper phase sequence.
Exhaust over-temperature switch is activated. Sign of resistor over temperature. Verify and
ensure air intake and exhaust openings are clear of any debris, blockage or obstruction. Check
for proper -blower operation and proper direction of airflow.
Air switch or Air failure auxiliary relay is malfunctioning or not operating correctly.
Air switch high pressure intake tubing obstruction. Remove, clean and replace tubing as
necessary.
5) Over-Temp fault indication on HMI Display.
Obstruction or restriction of air flow at Load Bank cold-air intake or hot-air exhaust.
Blower motor phasing is incorrect causing rotation of fan blade and wrong direction of cooling
air flow. Check motor power connections for proper phase sequence.
Airflow switch is activated indicating a loss of cooling airflow. Sign of resistor over-temperature.
Verify and ensure air intake and exhaust openings are clear of any debris, blockage or
obstruction.
Check for proper blower operation and proper direction of airflow.
