TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
14
07/24/20
www.atcontrols.com
IOM08032 REVISION 01
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
REMEDIES
No response from unit
(All lights are off)
No power.
Excessive voltage applied to unit.
Blown or missing fuse.
Check power source.
Replace unit.
Replace with appropriate fuse; see
“Specifications in manual.
No response from unit, and no response from
adjust (▲ and ▼) or MODE buttons.
(MANUAL/FB POT CAL light is lit solid)
Jumper wire on J7 terminal block is missing.
Auto/Manual station is improperly wired.
Install jumper wire on J7 terminal block.
Check wiring on Auto/Manual station; see
“Override Mode” in manual.
Actuator rotates valve backwards
Actuator or valve is mounted incorrectly on
coupling.
Actuator needs to be reverse acting.
Remount actuator as necessary.
Refer to “Close” and “Open” modes in manual.
Actuator does not respond to input signal (all
FAULT indicators off).
Closed and open positions are set to the same
position.
Set close and open settings; refer to “Close”
and “Open” modes in manual.
Motor 1 or 2 No Motion (Stall) FAULT indicators
flash after actuator reaches fully closed or open
position.
Closed or open limit switches set inside the
operating range.
Torque switches trip due to mechanical end
stops set inside the operating range.
Adjust limit switch cams; refer to “Close” and
“Open” modes in manual.
Adjust mechanical end stops; refer to “Close”
and “Open” modes in manual.
AUX CLOSE OUTPUT or AUX OPEN OUTPUT
indicators flash.
If an OTR-100 or OTR-101 option module is not
installed, no remedy is required.
Actuator position is near close or open.
If and OTR-100 or OTR-101 option module is
installed, set Aux Close and Aux Open
positions; refer to “Aux Close Output” and “Aux
Open Output” modes in manual.
Actuator hunts for position.
Sloppy gear tooth engagement.
No motor brake or brake slipping.
Unstable command input signal from PID
control loop.
Adjust feedback potentiometer gears for tight
engagement.
Install or repair motor brake.
Adjust PID parameters for stable command
signal.
Triac output failure
(Motor buzzes and overheats).
Perform appropriate remedy, then replace the
unit.
Exposure to water from conduit entrance.
Exposure to water from unsealed actuator
housing.
Exposure to moisture from condensate.
Corrosion from exposure to salts or acids.
External power applied to motor connections as
J1-1 or J1-3.
Motor capacitor is defective or has incorrect
voltage rating.
Lightning or power surge.
Install drip loop at conduit entrance.
Inspect and/or replace actuator housing gasket;
use actuator with proper sealing.
Use heater and thermostat and/or desicant
packets.
Use corrosion inhibitors and desicant packets.
Remove connector J1 prior to applying external
power.
Replace motor capacitor.
Replace unit.
A-T Controls product, when properly selected, is designed to perform its intended function safely during its useful life. However, the purchaser or user of A-T Controls products
should be aware that A-T Controls products might be used in numerous applications under a wide variety of industrial service conditions. Although A-T Controls can provide
general guidelines, it cannot provide specific data and warnings for all possible applications. The purchaser / user must therefore assume the ultimate responsibility for the
proper sizing and selection, installation, operation, and maintenance of A-T Controls products. The user should read and understand the installation operation maintenance
(IOM) instructions included with the product and train its employees and contractors in the safe use of A-T Controls products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only. Because A-T Controls is
continually improving and upgrading its product design, the specifications, dimensions and information contained in this literature are subject to change without notice. Should
any question arise concerning these specifications, the purchaser/user should contact A-T Controls.
For product specifications go to
http://download.a-tcontrols.com/
A-T Controls, Inc. • 9955 International Boulevard, Cincinnati, OH 45246 • Phone: (513) 530-5175 • Fax: (513) 247-5462 •
www.atcontrols.com
