Honeywell DR4300 Product Manual page 107

Lower Display
Prompt
OUTALG
(continued)
CURRNG
CTRALG
4/00
Upper Display
Range of Setting
or Selection
Tcur
FULL [factory setting]
HALF
ON/OFF [factory setting]
DR4300 Circular Chart Recorder Product Manual
Configuration, Startup, and Operation
Parameter
Definition
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.
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.
CONTROL ALGORITHM—Use this to specify the type of
control appropriate for your application.
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 %.
of Recorder with Display
95