Table 4-10 Loop Prompts - Honeywell VPR100 User Manual

Loop Menu Items
Table 4-10 alphabetically describes every loop menu item. See Table 4-2 for additional prompts.
Prompt
APPROACH HIGH Enter a value 0.1 to 100 or
OFF.
APPROACH LOW Enter a value 0.1 to 100 or
OFF.
AUTO/MAN SELECT OFF, discrete parameter, 0, 1
CHG ACTION INPUT OFF, discrete parameter, 0, 1
CONTROL ACTION Reverse (REV) or Direct (DIR)
Acting Control.
DISCR VS KEY SEL OFF, discrete parameter, 0, 1
DUAL TUNING SEL OFF, discrete parameter, 0, 1
12/00

Table 4-10 Loop Prompts

Range/Selections
VPR & VRX – User Manual
Programming Function Blocks and Features
Definition
This function affects the process variable approach to
setpoint when the process variable value is less than the
setpoint value. The value entered is the percent of span
deviation from setpoint at which a recalculation of the loop
integral value will occur. Enter a starting value equal to
the proportional band value (1/gain value) x 100 if Gain is
used, or OFF at initial configuration. The value may be
altered Online for final loop tuning. This function is useful
for batch startup from a "cold" condition to control
excessive overshoot when setpoint is reached.
Affects the process variable approach to setpoint when
the process variable value is greater than the setpoint
value.
This parameter takes the place of the Auto/Man button
when the DISCR VS KEY SEL discrete is ON (1).
AUTO/MAN SELECT = ON(1) = Manual mode
AUTO/MAN SELECT = OFF (0) = Automatic mode
When DISCR VS KEY SEL is OFF(0), AUTO/MAN SEL
has no effect.
Change Action Input. Selects the opposite control action
from that selected for the control action (see CONTROL
ACTION). Control action is opposite when the discrete
value is ON or "1".
When Reverse Acting Control is selected, the loop output
will increase as the process variable becomes less than
setpoint, and will decrease as it becomes greater than the
setpoint. When Direct Acting Control is selected, the
output action is opposite.
Discrete vs. Keyboard select. When this discrete is ON
(1), the Auto/Man and Setpoint buttons are disabled; their
functioning is transferred to the AUTO/MAN SELECT and
SETPOINT SELECT discretes. See AUTO/MAN SELECT
and SETPOINT SELECT. Status changes made by
AUTO/MAN SELECT and SETPOINT SELECT will
remain when DISCR VS KEY SEL is OFF (0).
When ON(1), selects the second set of tuning constants
(#2). A bumpless transfer (integral term adjusted)
calculation will be made on transition.
93