Red Lion PCU - Manual (Page 7)

7
PROTECTED PARAMETERS MODE *
The protected parameters mode is enabled when program disable is active.
This mode prevents access to the configuration modes without the proper access
code number. Only the parameters that are selected in the configuration 3
parameter lock-out section can be accessed.
“ProP” - Enter Proportional band
“Intt” - Enter integral time
“dErt” - Enter derivative time
“rtio” - Enter remote setpoint ratio value
“bIAS” - Enter remote setpoint bias value
“SP-2” - Enter internal cascade, secondary setpoint
“Pb-2” - Enter internal cascade, secondary
proportional band
“It-2” - Enter internal cascade, secondary integral
time
“dt-2” - Enter internal cascade, secondary derivative
time
“AL-1” - Enter value for alarm #1
“AL-2” - Enter value for alarm #2
“CodE” - Enter access value to unprotected
parameters & configuration parameters
* These parameters may not appear due to option configuration or other
programming.
OUTPUT MODULES
TYPICAL CONNECTIONS
Relay:
Type: Form-C (Form-A with some models. See ordering information.)
Rating: 5 amps @ 120/240 VAC or 28 VDC (resistive load), 1/8 HP @ 120
VAC (inductive) maximum.
Life Expectancy: 100,000 cycles at maximum load rating.
(Decreasing load and/or increasing cycle time, increases life expectancy).
Logic/SSR Drive: Can drive multiple SSR Power Units.
Type: Non-isolated switched DC, 12 VDC typical
Drive: 45 mA maximum.
Triac:
Type: Isolated, Zero Crossing Detection
Rating:
Voltage: 120/240 VAC
Max. Load Current: 1 ampere @ 35°C
0.75 ampere @ 50°C
Min. Load Current: 10 mA
Off State Leakage Current: 7 mA max. @ 60 Hz
Operating Frequency: 20 to 400 Hz
Protection: Internal Transient Snubber, Fused
LOAD
A
B
C
POWER 5 AMPS
AT
240 VAC
RELAY
MODULE
DO NOT CONNECT
SSR
POWER
UNIT
LOAD
4
3
1
2
A
B
C
POWER
+12VDC
UNREG.
+
-
NOT
ISOLATED
LOGIC/SSR DRIVE
MODULE
POWER
120VAC
AT
1 AMP
120/240VAC
ISOLATED
A
B
C
RELAY OR
DEVICE
TRIAC
LOAD DO NOT CONNECT
TRIAC MODULE
APPLICATION
A chemical company would like to
maintain the level of an acid solution tank to
insure constant availability for their process.
They have chosen a PCU controller which
has a continuous level probe with a 4 to 20
mA output proportional to tank level,
connected to the input terminals. The tank is
filled by controlling the position of a
proportional control valve. The control valve
is controlled by a 3 to 15 PSI air signal.
The PCU uses the level control input as its
feedback. The 4 to 20 mA input signal is
scaled so that 4 mA equals 0% and 20 mA
equals 100%.
The 4 to 20 mA output of the PCU is taken
to an I/P converter to convert the 4 to 20 mA
output to a 3 to 15 PSI signal for the control
valve. The relay outputs of the PCU are used
for high and low level alarms.