Solid-State Switch and Form C Outputs
The four Form C mechanical relays, and one NO solid-state switch pulse output are completely independent, electrically
isolated and can be programmed as either pulse or setpoint outputs .
Totalizer Pulse Output
When the
Totalizer
function is selected, the unit of measure and resolution are independent of the displayed units, and can
be programmed where 1 pulse occurs once every 0000000 .1… 999999999 of units selected, with any pulse width from
0001…9999 mS .
Setpoints
The setpoint programming is extremely powerful and flexible, with unit of measure and resolution independent of the
displayed units . Since the setpoint, release point and their associated time delays are fully independent, the alarm can be
either a high rate or low rate, depending on whether the setpoint is selected greater than the release point, or the release
point is greater than the setpoint . For applications where the relay must remained energized, once set, a latching feature is
provided . When latched, the relay remains energized until reset from the front panel . While design planning, note that both
the relays and the pulse outputs can be programmed as alarm points and only the relays provide both normally open and
normally closed contacts . The switch is a simple NO contact .
Terminology
Display
Definition
Function
SETPT
Setpoint
If the setpoint value is a greater than the release point value, when the
displayed flow rate exceeds the setpoint, the
Set Point Delay
timer starts . If the
setpoint is less than the release point when the flow drops below the setpoint,
the timer starts .
SDLY
Setpoint time delay
If the setpoint remains crossed for a continuous period of time exceeding the
setpoint delay setting, the relay energizes . If the flow rate briefly re-crosses
the setpoint before the timer reaches its setting, the timer resets and waits for
another setpoint crossing before restarting the count from zero .
LATCH
Locks relay in energized state If
Latch
is chosen, once energized by the setpoint time delay, the relay remains
energized until a reset is selected from the front panel . Otherwise, the relay
de-energizes when the
Release Point Delay Timer
times out .
RELP
Release point
If the relay is already energized, is not latched and the flow input crosses the
release point, the
Release Point Delay
timer starts .
RDLY
Release point time delay
If the release point remains crossed for a continuous period of time and
exceeds the release point delay setting, the relay de-energizes . If the flow rate
briefly re-crosses the release point before the timer reaches its setting, the
timer resets and waits for another release point, crossing before restarting the
count from zero .
High Flow Set Point
The
SETPT
must be a value greater than the
RELP
. The relay output will have continuity between its
N.C.
terminal and
COM
until the flow has exceeded the
SETPT
for a continuous period of time exceeding the
SDLY
. At this time, the
N.C.
connection
opens and the
N.O.
contact will have continuity to the
COM
terminal . When the flow has dropped below the
RELP
for a
continuous period of time exceeding the
RDLY
, the relay states return to the original states . If the latch has been set to
ON
once the setpoint and set delay have been satisfied, the relay will not release until manually reset .
Low Flow Set Point
The
SETPT
must be a value less than the
RELP
. The relay output will have continuity between its
N.C.
terminal and
COM
until
the flow drops below the
SETPT
for a continuous period of time exceeding the
SDLY
. At this time, the
N.C.
connection will open
and the
N.O.
contact will have continuity to the
COM
terminal . When the flow again has risen above the
RELP
for a continuous
period of time, exceeding the
RDLY
, the relay states return to the original states . If the latch has been set to
ON
when the
setpoint and set delay have been satisfied, the relay will not release until manually reset .
Programming
Page 23
October 2017
CTL-UM-01026-EN-05
