Configuration, Startup, and Operation
of Recorder with Display
4/00 DR4300 Circular Chart Recorder Product Manual 95
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
OUTALG
(continued)
Tcur
TIME/CURRENT DUPLEX (Relay = Cool)—Similar to
CurT, except that current is active for 50 % to 100 %
(tuning set 1) and relay is active for 0 % to 50 % (tuning
set 2).
Control group functions “CURRNG” and "DBAND" are
affected.
CURRNG
FULL [factory setting]
HALF
CURRENT RANGE—This parameter appears if
“OUTALG” is set to “CurT” or “Tcur”.
FULL—Current output is calculated over the full range
0 % to 100 %. For example, a control output of 50 %
would result in a 12 mA current output.
HALF—Current output is calculated over half the range
(50 % to 100 %). For example, a control output of 50 %
would result in a 4 mA current output.
CTRALG CONTROL ALGORITHM—Use this to specify the type of
control appropriate for your application.
ON/OFF [factory setting]
ON/OFF is the simplest type of control. The output can
be either ON (100 %) or OFF (0 %). The process variable
(PV) is compared with the setpoint (SP) to determine the
sign of the error (ERROR = PV–SP). The ON/OFF
algorithm operates on the sign of the error.
In direct-acting control (set with parameter “ACTION”
described below), when the error is positive, the output is
100 %. When the error is negative, the output is 0 %. If
the control action is reverse, the opposite is true. An
adjustable overlap is provided between the ON and OFF
states. (See “HYST” below.)
DUPLEX ON/OFF is an extension of this algorithm that
applies when the “OUTLAG” is set for “RLYD” (relay
duplex). It allows for the operation of a second ON/OFF
output. There is a configurable deadband (see “DBAND”
below) between the operating ranges of the two inputs,
and a separately configurable overlap (“HYST”) of the ON
and OFF states of each output. With no relay action the
controller output will read 50 %.
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