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21
LOSS OF DEMAND INPUT
SIGNAL (L.O.S.)
When the Demand input signal drops to
approximately –5%, the DCM-2 considers the
Demand input signal to be invalid. DCM-2s are
typically configured to stop the drive during L.O.S.
conditions, but may be configured by the factory
or by using the HART or Serial interface to run the
drive to a predetermined position. Under the L.O.S.
condition, the “STAT” and “DEMAND” LEDs will
light. When the input signal is corrected, the drive
will automatically resume normal operation. The
value for LOS activation is configurable using the
HART (see page 47) or Serial interface (see page
70). Alarm indication is available at terminal E.
POSITION:
CONTACTLESS POSITION
SENSOR (CPS)
The CPS provides the DCM-2 with a continuous
feedback signal proportional to the position of the
drive’s output shaft.
The position sensing function of the CPS is
provided by a ferrite magnetic sensing element.
An electronic circuit translates the signal from the
ferrite magnetic sensor into a position signal used by
the DCM-2 to control the drive. The typical output
voltage of the CPS ranges from 1.0 V at the CCW
end of travel, to 5.0 V at the CW end of travel. A
4–20 mA position feedback signal is available for
remote position indication (see page 17). If the CPS
Position signal to the DCM-2 is out of the calibrated
range limits, the "STAT" and "POSITION" LEDs will
light and the drive will not operate until the limits are
adjusted or the CPS is corrected. Alarm indication
is available at terminal E.
TORQUE PROTECTION (FOR
DRIVES EQUIPPED WITH THIS
OPTION)
DCM-2s are equipped with a torque sensing
module that will light the “STAT” and “TRQ/
THRUST” LEDs in the event excessive torque is
detected. This alarm is normally set to activate
when torque exceeds 105% of the drive rating.
Torques above 150% of the drive rating will cause
the DCM-2 to stop trying to run in the direction of
the high torque. When the over torque condition
is corrected, the drive will automatically resume
normal operation. The torque sensing module
also provides a number of torque related features
using the HART interface (see page 48). Torque
alarm may be enabled or disabled using the
HART (see page 48) or Serial interface (see page
71). Torque alarm levels may be adjusted using
the HART or Serial interfaces. Alarm indication is
available at terminal E.
STALL PROTECTION AND
ANNUNCIATION
If the drive output shaft cannot reach a desired
position within approximately 300 seconds, the
DCM-2 shuts off power to the motor and the “STAT”
and “STALL” LEDs will light. The stall condition
timing is factory configurable (or configurable using
the HART or Serial interface) from 300 seconds to
as low as 30 seconds and is initially set according
to the specification at time of order.
A sensed stall condition is cleared by either
reversing the Demand input signal from the
controller (such that the drive tries to run in
the direction opposite the blocked direction),
performing a "Reset Stall" or "Board Reset" using
the HART interface (see page 42), or by switching
the drive power off and on. Alarm indication is
available at terminal E.
TEMPERATURE
DCM-2s are equipped with a temperature
sensing circuit. The “STAT” and “TEMP
°F” LEDs will light when the drive’s ambient
temperature exceeds the rating of the drive.
Specific temperature readings are available using
the HART (see page 40) or Serial (see page
72) interface. Alarm indication is available at
terminal E.
FEEDBACK SIGNAL
The feedback sourcing module provides a
4–20 mA analog output signal that represents the
drive output shaft position in terms of 0–100% of
full rotational travel (configurable via the HART
(see page 56) or Serial (see page 75) interface).
This signal can be remotely monitored or used
by a controller or indicator. The “STAT” and “FB
OPEN” LEDs will light if the function is enabled
and there is no current in the loop. The Feedback
signal can be factory configured as disabled, or
disabled using the HART (see page 46) or Serial
(see page 71) interface. Alarm indication is
available at terminal E.
STOP/LIMIT INDICATION
The “STAT” and “STOP/LIMIT” LEDs will
light if the Handswitch is in the “STOP” position.
These LEDs will also light if the drive is at a
limit and is not in balance. Alarm indication is
available at terminal E.