Beck 14-100, Инструкция по эксплуатации

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75
80-1403-01, Rev. 3
Demand Signal Commands
Command
dem0pctma
n
Used with analog
Demand signals.
dem100pctma
n
Used with analog
Demand signals.
trimdem4 mA
4
Used with analog
Demand signals.
trimdem20 mA
20
Used with analog
Demand signals.
demlos
n
Used with analog
Demand signals.
demlosgtp
n
Used with analog
Demand signals.
Description
Sets and/or displays the Demand signal
value that corresponds to 0%.
Sets and/or displaysthe Demand signal
value that corresponds to 100%.
Trims the Demand analog-to-digital
sensing circuit to be accurate at 4 mA.
This command should only be used
when the Demand signal at the actuator
is exactly 4 mA. Trim is factory set.
Recalibration should not be necessary.
Trims the Demand analog-to-digital
sensing circuit to be accurate at 20 mA.
This command should only be used
when the Demand signal at the actuator
is exactly 20 mA. Trim is factory set.
Recalibration should not be necessary.
Sets and/or displays the Demand signal
threshold below which the DCM-3
recognizes that the signal is lost. The
threshold is entered as a value in mA.
This command also sets and/or displays
the action initiated by the actuator
during LOS (Loss Of Signal). LOS
action options are "sip" (stay in place)
or "gtp" (go to position). Demlos always
reports both settings, but only sets one
argument at a time. Demlos must be
used twice to set the threshold and
action.
Sets and/or displays the position to
which the actuator will run upon loss
of the Demand signal (LOS). This
command has no effect if the actuator is
set to "sip" (stay in place).
Argument n and Information
n = the Demand signal as a decimal in
mA. The minimum acceptable value is
0.50. The maximum acceptable value is
100% Demand less 4.00. For example,
if the 100% Demand signal is 20.00,
then the 0% Demand signal must be
16.00 or less.
n = the Demand signal as a decimal
in milliamps. The minimum acceptable
value is the 0% Demand plus 4.00. For
example, if the 0% Demand signal is
4.00, then the 100% Demand signal
must be 8.00 or greater. The maximum
acceptable value is 21.00.
Trim can only be performed at 4 mA.
Trim can only be performed at 20 mA.
n = the Demand signal in mA below
which LOS occurs. A typical value for a
4 mA–20 mA system is 3.20.
— OR —
n = "sip", "gtp" or "pat".
Mode “pat” acts the same as Stay in
Place, but suppresses the alarm. This
is used in some pulsed applications.
n = the desired position of the actuator
expressed as a percentage of actuator
travel. For example, if the desired go-
to-position is 50%, then n = 50.00.