West Control Solutions MRC 7000 Controller Manual - Manual (Page 6)

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1.1.2 RECORDING
The instrument records the selected process variable on a 10-inch circular chart. One box of
standard charts is provided with each recorder. Charts are available in a wide selection of
ranges. Chart rotation speed is programmable from 0.1 to 999.9 hours per revolution in 0.1
hour increments. The instrument can be ordered with one or two pens. Pen 1 is red and Pen 2
is green. Pens are the disposable fiber-tip type.
1.1.3 DISPLAYS
Each instrument is provided with a digital display and status indicator for each pen provided
(See Figure 1-1, page 5). The display may be configured to display the Process Value,
Process Value and Setpoint, Deviation from Setpoint only, Deviation and Setpoint, or Setpoint
only. During configuration the display(s) is/are used to show the enabled modes of operation
and the parameter codes.
The display in the upper right corner is for Pen 1, the display in the lower right corner is for
Pen 2 (if provided). The display includes status indicators for Manual mode operation, Output
1, Output 2 , Alarm, degrees C, degrees F, engineering units, setpoint and minus sign. See
Figure 1-2 ( page 7).
Display resolution is programmable for 0.1 or 1 degree for thermocouple and RTD inputs, and
none, one, two or three decimal places for other input types.
1.1.4 CONTROL
The instrument can be provided with relay, solid state relay driver and milliamp DC outputs.
Instruments can be programmed for on-off, time proportioning, current proportioning or
position proportioning control depending upon the hardware present. Switching between the
Control mode and the Manual mode of operation is easily accomplished with a dedicated key
on the keypad. Switching is bumpless from the Control to the Manual mode, and while in
manual, manipulation of proportional outputs is possible. Each pen of a dual pen recording
controller is provided with its own AUTO/MANUAL key . Other standard control features
include proportional control output limits, setpoint limits, anti-reset windup and a unique
Automatic Transfer function. If configured, the Automatic Transfer function allows manual
control of the proportional output until the process reaches the setpoint at which time the
instrument will go into the Control (automatic) mode of operation.
1.1.5 ALARM
An Alarm indicator is standard for each pen. Two alarm functions are provided for each pen
and the alarm indicator will light if either alarm for that pen is on. Alarm settings are program-
mable. Alarm type may be selected as process direct or reverse (high or low), deviation from
setpoint direct or reverse, and deviation band open or closed within the band. Alarm outputs
can be provided by assigning any relay(s) Single Pole/Single Throw (SPST)or Solid State
Relay (SSR) driver to the respective alarm.
1.1.6 PROCESS VALUE RE-TRANSMISSION OUTPUT
If an instrument is specified with mADC current output(s), any of the outputs may be pro-
grammed to operate as a process value re-transmission output. The output is scaleable but
can not be used as a control output while assigned as a process value re-transmission output.