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DCM-2 HART INTERFACE Maintenance - Alarm Messages
Message
Description
“The Torque/Thrust is greater than the
output rating”
“Motor power has been removed due to
excessive output torque”
“The temperature is outside of –40F to
185F”
"Demand Signal is out of limit"
"Loop Current Detected while under
HART/FF Control"
"Loop Current Detected while set for LOS
PAT"
This is a Beck-specific message that can appear after the HART
®
-
defined (“Process applied to the non-primary variable is outside
the operating limits of the field device”) message mentioned
previously. It serves to further define the condition, and indicates
that the drive’s torque output is exceeding 105% of the calibrated
torque range of the drive.
This Beck-specific message appears after the “Torque is excessive”
message if the torque measurement has exceeded 150% of the
calibrated range and thus gone into a protective mode of operation
to prevent excessive torque in the event of an obstruction or
other problem. The drive ceases driving against the load until the
condition is reset. Although unlikely, it is possible to also get a “Drive
in stall” message (see misc. messages) with this message.
This is a Beck-specific message that can appear after the HART
®
-
defined (“Process applied to the non-primary variable is outside
the operating limits of the field device”) message mentioned
previously. It serves to further define the condition, and indicates
that the drive’s internal temperature is outside the -40° to 195°F
(-40º to 91ºC) range.
The Demand Signal has exceeded its measurable limits and has
entered saturation. The value reported for Demand does not
reflect the actual value.
This is a Beck specific alarm message that alerts the user
that analog current is present on the Demand terminals while
operating the drive using the HART configurator Manual Operation
menu. It is used to avoid confusion when a board is left in one
of the manual operation modes and is not properly restored to
"FOLLOW" mode.
PAT mode (Proportional mode) is a special Demand mode where
discrete logic inputs are used in place of the Analog Demand
signal. When operating in PAT mode, no Demand current should
be present. If current is detected, this alarm will be asserted.
Position Signal Messages
(The position signal is defined as the signal from the position sensor (CPS) to the DCM-2)
Message
Description
“Process applied to the primary variable
is outside the operating limits of the field
device”
This is a standard HART
®
-defined message that appears
whenever the HART
®
primary variable (Position signal) is outside
the design or calibrated range. The DCM-2 is designed to accept
a maximum position signal range of 0.25 to 5.35 V dc, and can be
calibrated anywhere within this range depending on the type of
CPS and desired stroke of the drive. Normally, new drives would
be calibrated for a 1–5 V dc position signal. Retrofit applications
are typically calibrated for a 0.45–2.6 V dc range.
Demand Signal and Process Variable Messages (con't)