Red Lion PSC - Manual (Page 6)

6
APPLICATION
A chemical treatment process requires the PH level of a solution be ramped
at staged levels over specific time periods during start-up. The PSC unit is
installed to meet this requirement.
After the tank is filled, the PSC’s user input is triggered to run profile 1 to
start the process. Alarm output 2 signals the operator if the PH level deviates
outside the running profile. The error band (profile conformance) is
programmed to the desired value to prevent the PH level from deviating from
the programmed setpoint profile. Timed event output 1 signals that the
profile process is complete.
11
10
9
8
7
6
5
4
3
2
pH
PROFILE
STARTED
PROFILE
PHASE
EVENT
OUTPUT 1
P1r1
P1 1
P1H1
P1 2
P1r2
P1 3 P1 4 P1 5
P1H2 P1r3 P1H3
LAST
PROFILE
PHASE
PROFILE
COMPLETE
TIME
P1 7
ON
115 VAC
(MAIN POWER)
4-20mA ANALOG OUTPUT OPTION
(RETRANSMIT % OUTPUT POWER)
MAIN CONTROL OUTPUT
DC INPUTS
ALARM 1 OPTION
(RELAY MODULE INSTALLED)
ALARM 2 OPTION
(RELAY MODULE INSTALLED)
115 VAC
PH DEVIATION
ALARM
HORN
CHEMICAL
TO BE
ADDED
I/P CONVERTER
TO END OF
PROCESS
INDICATOR
PH SENSOR
OUT
IN
1 AL2/OP2--A
2 AL2/OP2--B
3 AL2/OP2--C
4 OP1--A
5 OP1--B
6 OP1--C
7 USER INPUT
8 0--10V
9 4--20mA
10 COMM.
11 OUT+
12 OUT--
13 N/C
14 AL1--A
15 AL1--B
16 AL1--C