TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
7
07/24/20
www.atcontrols.com
IOM08032 REVISION 01
POSITION OUT CAL
The POSITION OUT CAL function is used to calibrate an
optional feedback transmitter output. An appropriate
transmitter option module is required to use this feature.
When the POSITION OUT CAL function is first selected
(by pressing the MODE button while in the LOSS OF
COMMAND function), the CLOSE indicator will flash, and
the voltage or current associated with the
closed
position
will appear at the option module output. If desired, the
output can be adjusted (using the adjust buttons) to any
value from 0 to 10V (for a voltage output) or 4 to 20mA
(for a current output). The new setting is saved when the
MODE button is pressed.
Pressing the MODE button again will leave the unit in the
POSITION OUT CAL function except that the OPEN
indicator will flash, and the output voltage or current
associated with the
open
position will appear at the option
module output. Like the
closed
setting, the output can be
adjusted to any voltage (from 0 to 10V) or current (from 4
to 20mA), and the new setting is then associated with the
open
position.
FAULT INDICATORS
The TDC-100 detects various fault conditions that
prohibit the unit from controlling the actuator. A
combination of the three Fault indicators (red, yellow, and
green) will turn on or flash to indicate a specific detected
fault. If an appropriate relay option module is installed, the
Fault relay output on the option module will also turn off
(indicating a fault) when any of the Fault indicators turn on
or flash. A communications option module can read the
specific condition(s) causing the fault. Note that a fault
condition DOES NOT disable the motor outputs when
manually controlling the actuator with the adjust buttons;
while useful for troubleshooting, care should be exercised
when operating the motor under a fault condition. The
OVERRIDE mode can also operate the motor when a
fault condition exists - see OVERRIDE MODE for details.
Note that the indicators may not indicate all the fault
conditions that may exist. This means that when the
indicated fault is corrected, the unit may display another
fault that has not been corrected. The following table
provides a summary of the Fault indicators which is
followed by a description of each fault.
RED
YEL
GRN
FAULT
Flash
Flash
OFF
Motor 1 No Motion (Stall)
Flash
OFF
Flash Motor 2 No Motion (Stall)
Flash
Flash
Flash Double No Motion (Stall)
OFF
OFF
Flash Feedback Alarm
OFF
Flash
OFF
Loss of Command
OFF
ON
OFF
Command Out of Range
OFF
Flash
Flash
Feedback Alarm and
Loss of Command
OFF
ON
Flash
Feedback Alarm and
Command Out of Range
Motor 1 No Motion (Stall)
- A fault condition is detected
when no actuator motion is detected while the Motor 1
output is turned on. The fault condition will disable the
Motor 1 output only, and the fault is cleared when the
TDC-100 detects a motion greater than 1.5
in either
direction. The fault can be cleared if 1) the command
signal commands a Motor 2 operation, 2) manual
operation with the adjust buttons results in a motion
greater than 1.5
, or 3) a mechanical manual override
forces the 1.5
motion, provided the mechanical motion is
monitored by the feedback pot.
Motor 2 No Motion (Stall)
- A fault is detected when no
actuator motion is detected while the Motor 2 output is
turned on. The fault can be cleared in the same manner
as a Motor 1 Stall (see above).
Double No Motion (Stall)
- If the TDC-100 detects no
actuator motion in either direction, both motor outputs will
be disabled. The command signal cannot clear this
condition; only manual operation or a mechanical override
can clear the fault. Alternatively, the TDC-100 can be
powered off and then on to temporarily clear the fault;
however, this practice should be avoided without
permanently correcting the cause of such a fault.
Feedback Alarm
- A fault condition is detected whenever
the feedback signal is out of range (that is, less than 5%
of the potentiometer value or more than 95% of the
potentiometer value), or when any of the potentiometer
connections are broken. Normal operation resumes when
the potentiometer is reconnected or back in range.
Loss of Command
- If the command signal is
disconnected, the fault indicator will remain on until the
signal is reconnected. See LOSS OF COMMAND for
details.
Command Out of Range
– If the command signal goes
out of range, the fault indication will remain on until the
signal is back in range. See LOSS OF COMMAND for
details.
