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DR4300 Circular Chart Recorder
DR4300 Circular Chart Recorder Product Manual 12/03
2
Communications
The Modbus communication option permits configuration of the unit and monitoring of process variables
over a standard multi-drop serial communications link.
Relay outputs for control and alarms
The models with display and keypad are available with output relays, two for each pen channel. These
relays can be wired for Normally Open (NO) and Normally Closed (NC) terminals. ON-OFF control can
be performed using one relay (relay simplex control) or two relays (relay duplex control).
Any relay not used for control is available for alarming. Two alarm setpoints can be configured for each
alarm relay. An adjustable hysteresis of 0.0 % to 100.0 % is configurable for the alarm setpoint.
Analog output for control or retransmission
Depending on the model ordered, a 4 to 20 mA current output may be available for control or
retransmission of a process variable (“auxiliary output”).
Failsafe operation
The control function can operate in automatic or manual mode. In automatic the control function works to
maintain the process variable at the setpoint entered locally by the operator. During configuration a
“failsafe” value can be specified. This value is used as the output at power up and in case of input failure
during automatic operation. (When the unit goes to failsafe, the control function goes to manual mode.)
In manual mode the operator enters the output locally. If the recorder has gone to failsafe operation, the
operator will be able to change the output value from the failsafe value specified during configuration.
Timer and totalizer options
The recorder is available with timer and totalizer options. The timer can be started locally, remotely, or by
an alarm. The unit can be configured to display elapsed time or time remaining. At the end of the timeout
period Relay 2 is energized, and remains energized until the timer is reset. The totalizer can be reset
locally or remotely; its displayed value can be scaled.
Setpoint Programming Option
The recorder is available with a Setpoint Program option. This feature allows configuration of up to four
setpoint programs using a total of twenty-four ramp and soak segments. A setpoint and time is configured
for each segment. The program can be set up to include guaranteed soak segments. A plus/minus
deviation is configured for all soak segments. Whenever the plus/minus deviation is exceeded, soak timing
is frozen.
Display and keypad
In addition to process variables, the display can show output, setpoint, and deviation real time values if the
recorder is equipped with optional outputs. The upper display uses four characters to display the input
value. The lower display shows other parameters using a two- or three-character label and four- or three-
digit values. In addition, status and error messages flash on the lower display when necessary.