DHC-100
PEAKTRONICS U.S. Patent 7,466,100 applies to this product 7
position") and a fault will be indicated (see FAULT IN-
DICATORS).
POSITION OUT CAL
The POSITION OUT CAL function is used to
calibrate an optional feedback transmitter output. An ap-
propriate 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 de-
sired, 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 cur-
rent 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 DHC-100 detects various fault conditions that
prohibit the unit from controlling the actuator. A combi-
nation 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 turn off
(indicating a fault) when any of the Fault indicators turn
on or flash. A communications option module can also
read the specific conditions causing a 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 condi-
tion. 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 pro-
vides a summary of the Fault indications which is fol-
lowed by a description of each fault.
RED YEL GRN FAULT
ON flash OFF Motor 1 No Motion (Stall)
ON OFF flash Motor 2 No Motion (Stall)
ON 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
DHC-100 detects a motion greater than 1.5 in either di-
rection. 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 feed-
back 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 DHC-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 over-
ride can clear the fault. Alternatively, the DHC-100 can
be powered off and then on to temporarily clear the fault;
however, this practice should be avoided without perma-
nently 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 potenti-
ometer value), or when any of the potentiometer connec-
tions are broken. Normal operation resumes when the
potentiometer is reconnected or back in range.
Loss of Command - If the command signal is disconnect-
ed, the fault indication 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.
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