Warranty, Service & Repair
WARRANTY
Flowline warrants to the original purchaser of its products that such
products will be free from defects in material and workmanship under
normal use and service for a period which is equal to the shorter of
one year from the date of purchase of such products or two years from
the date of manufacture of such products.
This warranty covers only those components of the products which
are non-moving and not subject to normal wear. Moreover, products
which are modified or altered, and electrical cables which are cut to
length during installation are not covered by this warranty.
FLOWLINE's obligation under this warranty is solely and exclusively limited to the repair or replacement, at FLOWLINE's option, of the
products (or components thereof) which FLOWLINE's examination
proves to its satisfaction to be defective. FLOWLINE SHALL HAVE
NO OBLIGATION FOR CONSEQUENTIAL DAMAGES TO PERSONAL OR REAL PROPERTY, OR FOR INJURY TO ANY PERSON.
This warranty does not apply to products which have been subject to
electrical or chemical damage due to improper use, accident, negligence, abuse or misuse. Abuse shall be assumed when indicated by
electrical damage to relays, reed switches or other components. The
warranty does not apply to products which are damaged during shipment back to FLOWLINE's factory or designated service center or are
returned without the original casing on the products. Moreover, this
warranty becomes immediately null and void if anyone other than service personnel authorized by Flowline attempts to repair the defective
products.
Products which are thought to be defective must be shipped prepaid
and insured to FLOWLINE's factory or a designated service center
(the identity and address of which will be provided upon request)
within 30 days of the discovery of the defect. Such defective products
must be accompanied by proof of the date of purchase.
Flowline further reserves the right to unilaterally wave this warranty
and to dispose of any product returned to Flowline where:
a. There is evidence of a potentially hazardous material present
with product.
b. The product has remained unclaimed at Flowline for longer than
30 days after dutifully requesting disposition of the product.
THERE ARE NO WARRANTIES WHICH EXTEND BEYOND
THE DESCRIPTION ON THE FACE OF THIS WARRANTY. This
warranty and the obligations and liabilities of Flowline under it are
exclusive and instead of, and the original purchaser hereby waives, all
other remedies, warranties, guarantees or liabilities, express or
implied. EXCLUDED FROM THIS WARRANTY IS THE IMPLIED
WARRANTY OF FITNESS OF THE PRODUCTS FOR APARTICULAR PURPOSE OR USE AND THE IMPLIED WARRANTY OF
MERCHANT ABILITY OF THE PRODUCTS.
This warranty may not be extended, altered or varied except by a written instrument signed by a duly-authorized officer of Flowline, Inc.
To register your product with the manufacturer , fill out the enclosed
warranty card and return it immediately to:
Flowline Inc.
10500 Humbolt Street
Los Alamitos, CA 90720.
If for some reason your product must be returned for factory service, contact Flowline Inc. to receive a Material Return
Authorization number (MRA) first, providing the following information:
1. Part Number, Serial Number
2. Name and telephone number of someone who can answer
technical questions related to the product and its application.
3. Return Shipping Address
4. Brief Description of the Symptom
5. Brief Description of the Application
Once you have received a Material Return Authorization number,
ship the product prepaid in its original packing to:
Flowline Factory Service
MRA _____
10500 Humbolt Street
Los Alamitos, CA 90720
To avoid delays in processing your repair, write the MRA on the
shipping label. Please include the information about the malfunction with your product. This information enables our service technicians to process your repair order as quickly as possible.
®
Version 4.0A
© 1999 FLOWLINE Inc.
All rights reserved.
Manual # LC900007 5/99
Continuous Relay Controller
LC52 Series Owner’s Manual
Step One
SPECIFICATIONS
Supply voltage: 120 VAC (240 VAC), 50 - 60 Hz.
Consumption: 5 Watt
Sensor input: (1) Transmitter
Sensor supply: 24 VDC @ 1.5 Watts
Loop power: 4-20 mA, 18 VDC
Set point adjustment: Push button
Configuration: 1: High or low level alarm
2: High and low level alarm
3: Automatic fill or empty
4: Automatic fill or empty with alarm
LED display: Alphanumeric, 3.5 digit
LED indicators: Power and relay status
Bar graph display: 4-20 mA with set points
Alarm indication: Amber: < 4 mA
Red: > 20 mA
Security: Lock out mode
Relay types: (1) SPDT
(1) Latched SPDT
Relay rating: 250 VAC, 10A, 1/2 hp.
Relay mode: Selectable, NO or NC
Relay latch: ON or OFF
Time delay: 0-60 seconds
Repeater output: 4-20 mA, 12-36 VDC
Fail safety: Power fail-safe
Temperature range: F: -40° to 158°
C: -40° to 70°
Enclosure mounting: 35 mm DIN (EN 50 022)
Enclosure material: Polypropylene
(U.L. 94 VO)
CE Compliance: EN 50082-2 immunity
EN 55011 emission
EN 61010-1 Safety
Continuous
Controller
Power
Supply
AC
AC
GND
Sensor
Input
Relay
2
NC
C
NO
28 VDC
GND
24 VDC
Invert Logic
Time Delay
Relay
1
NC
C
NO
Invert Logic
Time Delay
Repeater
Output
+
GND
Sensor Logic
Set Points
RLY2A
ON
OFF
RLY2B
No Effect
No Effect
Relay
ON
OFF
Invert OFF Latch Off
RLY2A
ON
OFF
RLY2B
No Effect
No Effect
Relay
OFF
ON
Invert ON Latch Off
RLY2A
ON
OFF
ON
OFF
RLY2B
ON
ON
OFF
OFF
Relay
ON
No Change
No Change
OFF
Invert OFF Latch ON
RLY2A
ON
OFF
ON
OFF
RLY2B
ON
ON
OFF
OFF
Relay
OFF
No Change
No Change
ON
Invert ON Latch ON
Relay Logic Table:
Relay 2 can either be a independent relay similar to relay 1 or can be a latching
relay with latch ON. With Latch Off, relay 2 will only respond to the RLY2A
setting. RLY2B will be ignored.
With Latch ON, relay 2 will actuate when RLY2A and RLY2B are in the same condition. The relay will not change its condition until both inputs reverse their state.
Internal Wiring Logic
Step Two Step Three
SAFETY PRECAUTIONS GUIDE TO CONTROLS
About This Manual:
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS PRODUCT. This manual
includes information on the Continuous Relay Controllers from
Flowline: LC52-1001.
User’s Responsibility for Safety:
Flowline manufactures several models of controller, with different
mounting and switching configurations. It is the user’s responsibility to select a controller model that is appropriate for the application, install it properly, perform tests of the installed system, and
maintain all components.
Electrical Shock Hazard:
It is possible to contact components on the controller that carry high
voltage, causing serious injury or death. All power to the controller
and the relay circuit(s) it controls should be turned OFF prior to working on the controller. If it is necessary to make adjustments during
powered operation, use extreme caution and use only insulated tools.
Making adjustments to powered controllers is not recommended.
Flammable or Explosive Applications:
LC52 series remote mount controllers should not be used with explosive or flammable liquids, which require an intrinsically safe rating.
If you are unsure of the suitability of a controller for your installation, consult your Flowline representative for further information.
Install In a Dry Location:
The controller housing is not designed to be immersed. It should
me mounted in such a way that it does not come into contact with
liquid. Its case is made out of PP (polypropylene). Refer to an
industry reference to ensure that compounds that may splash onto
the controller housing will not damage it. Such damage is not covered by the warranty.
Relay Contact Rating:
The relay is rated for a 10 amp resistive load. Many loads (such as
a motor during start-up or incandescent lights) are reactive and
have an inrush current characteristic that may be 10 to 20 times
their steady-state load rating. The use of a contact protection circuit
may be necessary for your installation if the 10 amp rating does not
provide an ample margin for such inrush currents.it should. In critical applications, redundant backup systems and alarms must be
used in addition to the primary system. Such backup systems
should use different sensor technologies where possible.
Make a Fail-Safe System:
Design a fail-safe system that accommodates the possibility of
relay or power failure. If power is cut off to the controller, it will
de-energize the relay. Make sure that the de-energized state of the
relay is the safe state in your process. For example, if controller
power is lost, a pump filling a tank will turn off if it is connected to
the Normally Open side of the relay.
While the internal relay is reliable, over the course of time relay failure is possible in two modes: under a heavy load the contacts may
be “welded” or stuck into the energized position, or corrosion may
build up on a contact so that it will not complete the circuit when it
should. In critical applications, redundant backup systems and
alarms must be used in addition to the primary system. Such backup systems should use different sensor technologies where possible.
While this manual offers some examples and suggestions to help
explain the operation of Flowline products, such examples are for
information only and are not intended as a complete guide to
installing any specific system.
1. Power indicator:This Green LED lights when AC power is ON.
2. Relay indicator: This Red LED will light whenever the con-
troller energizes the relay, in response to the transmitter input and
after the time delay.
3. AC Power terminals: Connection of 120 VAC power to the
controller. The setting may be changed to 240 VAC if desired.
This requires changing internal jumpers; this is covered in the
Installation section of the manual. Polarity (neutral and hot) does
not matter.
4. Relay terminals (NC, C, NO): Connect the device you wish to
control (pump, alarm etc.) to these terminals: supply to the COM
terminal, and the device to the NO or NC terminal as required.
The switched device should be a noninductive load of not more
than 10 amps; for reactive loads the current must be derated or
protection circuits used. When the red LED is ON and the relay is
in the energized state, the NO terminal will be closed and the NC
terminal will be open.
5. Invert switch:This switch reverses the logic of the relay control
in response to the switch(es): conditions that used to energize the
relay will now de-energize the relay and vice versa.
6. Time delay: Sets delay from 0 to 60 seconds. Hold Delay button
to increase delay in 5 second increments.
7. Digital display: Shows the current 4-20 mA signal in engineer-
ing units.
8. Input terminals: Connect the transmitter wires to these termi-
nals: A 24 VDC power is provided for current loop with an additional 28 VDC power terminal if required.
9. Latch switch (relay 2): This switch determines how the relay
will be energized in response to the two set points. When LATCH
is OFF , the relay responds to set point RLY2A only; when LATCH
is ON, the relay will energize or de-energize only when both set
points (RLY2A and RLY2B) are in the same condition (both wet
or both dry). The relay will remain latched until both set points
change conditions.
10.Bar Graph: Displays 4-20 mAsignal as a percentage of the range.
11.OP / SET:Used to scroll between set points during programming.
12.20 / Down: Used to decrease display value during programming
and for EasyCal™ Span set up.
13.4 / Up: Used to increase display value during programming and
for EasyCal™ Offset set up.
14.Repeater Output: Isolated terminal which reproduces the input
4-20 mAsignal. Terminal requires 12-36 VDC power for operation.
LATCH
ON OFF
PROPORTIONAL
CONTROLLER
PWR
RELAY 1
INVERT
DELAY
RELAY 2
INVERT
DELAY
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
3 4 4
1
9
5 62 5 62
7
8
14
10
13
12
11
Step Four Step Five
INSTALLATION WIRING
Panel DIN Rail Mounting
The controller may be mounted by either a back panel using two
screws through mounting holes located at the corners of the controller
or by snapping the controller on 35 mm DIN Rail.
Wiring to Input Terminals
Signal input is always through the 24 VDC terminal.
The 28 VDC terminal is used as an alternative
power supply for three-wire devices. Please note a
difference between 2-wire and 3-wire level transmitters and sourcing and sinking modes below.
Two-wire Transmitter Two-wire Transmitter
(Sourcing Mode / JWA) (Sinking Mode / JWB)
Three-wire Transmitter Three-wire Transmitter
(Sourcing Mode / JWA) (Sinking Mode / JWB)
Intrinsically Safe Two-wire Transmitter LU20-5001-IS
(Sinking Mode / JWB)
Note: Always install the controller in a location where it does not
come into contact with liquid.
Setting Input Polarity:
The LC52 can be set in one of two modes, sourcing and sinking. The
LC52 is shipped from the factory in the sourcing mode. This is compatible with the LA12-_0_1, LA15-50_1, LP75-20_1, LU20-50_1, LU3050_4 and LU35-50_4 with no adjustment required. If using a LU3050_3, LU35-50_3 and LU20-50_1-IS, follow the instructions below.
1. Remove the back panel of the controller and gently slide the printed circuit board (PCB) from the housing. Use caution when
removing the PCB.
2. Locate jumpers JWA and JWB on the PCB.
3. To change from sourcing to sinking, remove jumper from JWA
and place on JWB. The LC52 is shipped from the factory in the
sourcing mode (JWA active).
4. Gently return PCB into housing and replace back panel.
Note: Loop powered devices can operate in either the souring or sinking modes. Please see step 4 for proper wiring instructions.
Changing from 120 to 240 VAC:
1. Remove the back panel of the controller and gently slide the printed
circuit board from the housing. Use caution when removing the PCB.
2. Located jumpers JW1, JW2 and JW3 on the PCB.
3. To change to 240 VAC, remove jumpers from JW1 and JW2 and
place a single jumper across JW3. T o change to 120 VAC, remove
jumper JW3 and place jumpers across JW1 and JW2.
4. Gently return PCB into housing and replace back panel.
Repeater Output:
The isolated repeater
output reproduces the
input current signal.
External power is
required and should
not exceed a maximum of 36 VDC.
LB10-1001 LU20-5001-IS
Stahl Barrier Intrinsically Safe
9001/51-280-110-14 Level Transmitter
Voc= 28.0 V Vmax = 32 V
Isc= 105.9 mA Imax = 130 mA
Ca= 0.14 µF Ca = 0 µH
La= 3.2 mH La = 0 mF
3.475"
2.2"
.275"
.225"
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
Display
+ -
+ -
12-36 VDC
Power
Sourcing Mode
JWA
JWB
JWA
Sinking Mode
JWB
JW2
JW1
JW3
120 VAC
JW2
JW1
JW3
240 VAC
LA12-_0_1, LA15-50_1, LP75-20_1, LU20-50_1,
LU30-50_4 & LU35-50_4
LU30-50_3, LU35-50_3 & LU20-50_1-IS
No Change
Required
Change
Required
Sourcing
Device
Sinking
Device
35 mm
DIN Rail
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
(+) (-)
Two-Wire
Loop Powered
Level
Transmitter
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
(+) (-)
Two-Wire
Loop Powered
Level
Transmitter
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
Three-Wire
Sourcing
Level
Transmitter
Models:
LU30-50_3
LU35-50_3
White
Black
Red
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
Zener
Barrier
1
2
G
3
4
G
Non-Hazardous Area Hazardous Area
(+) (-)
Two-Wire
Intrinsically Safe
Level
Transmitter
PROPORTIONAL
CONTROLLER
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
Three-Wire
Sinking
Level
Transmitter
Models:
LU30-50_4
LU35-50_4
White
Black
Red
INPUT
( ) ( + )
( + )
28 VDC
50 mA
Max.
24 VDC
25 mA
Max.
GND
Relay Input Wiring:
The single pole, double throw isolated relay is
rated 250 VAC, 10 A, 1/2 Hp. The two terminals
marked Normally Open (NO) and Normally
Closed (NC) will be used in different applications.
Note: The “Normal” state is when the relay’s coil
is de-energized and the Red relay LED is Off.
Low-Level Alarm:
The goal is to make sure that the liquid level does not fall below a certain point. If it does, an alarm is supposed to sound, alerting the operator of a low-level condition.
If power is accidentally cut to the
controller, the sensor’s ability to warn
the operator of a low-level condition
could be lost. The system must alert
the operator not only to low fluid
level, but to controller power loss.
To do this, connect the hot lead of
the alarm to the NC side of the
relay terminal of the LC52. If
power is lost, the relay will be deenergized, and the alarm will sound (if there is still power to the alarm
circuit itself). The alarm circuit should have a non-interruptible power
supply or some other indicator or backup alarm to warn of a power
failure in the alarm circuit.
In this application, the normal status of the sensor at the bottom of the
tank will be wet, and the relay will be energized holding the alarm circuit open. Both the red relay LED and amber input LED will be on
simultaneously, so for this application, INVERT should be set to the
OFF position.
High Level Alarm:
In the same manner, the controller can be used to sound an alarm
when fluid reaches a high level, with just a change in the location of
the sensor and the setting of the INVERT switch.
• The alarm is still connected to the NC side of the relay to allow
for a power failure alarm.
• The sensor is normally dry. In this dry condition, we want the relay
to be energized so the alarm does not sound: i.e., the red relay LED
should be on whenever the amber sensor LED is off. So we turn
INVERT ON. If the fluid level rises to the high sensor point, the
sensor goes on, the relay de-energizes, and the alarm sounds.
Automatic Fill:
This system consists of a tank with a valve controller by the LC52. At
a low set point, the valve opens, filling the tank, At the high set point,
the valve closes. Part of a proper failsafe design for this particular system
is that if power is lost to the controller
for any reason, the valve filling the
tank must close. Therefore, we
connect the valve to the NO side of
the relay. When the relay is energized, the valve will open and fill
the tank. The relay indicator will
correspond directly to the
Open/Close status of the valve.
NOTE: If the device’s load exceeds the rating of the controller’ s r elay,
a stepper relay of higher capacity must be used as part of the system
design.
Determining the settings of LATCH and INVERT
This is the way the system must operate:
• When the liquid level is below the low set point, the valve should
open, starting to fill the tank.
• When the liquid is above the low set point, the valve will remain open.
• When the liquid reaches the high set point, the valve should close.
Latch: In any two-sensor control system, LATCH must be ON.
Invert: Referring to the logic chart in Step One, we look for the set-
ting that will de-energize the relay (valve close) when both inputs are
ON (High level reached). In this system, Invert should be ON.
Automatic Empty:
In the same manner, the controller can be used to automatically empty
a tank with just a change to the setting of the INVERT switch.
• The valve is still connected to the NO side of the relay to allow
for a power failure fail-safe condition.
• The normal state of the valve is closed. In this state, we want the
relay to be energized at the high set point (opening valve to drain
tank). The relay will de-energize at the low set point (closing valve).
Note: A fail-safe design is important. If the tank is being passively
filled, and a valve must be used to actively empty it, a power failure
to either the controller or the pump circuits will cause overflow.
Step Six Step Seven
INSTALLATION INSTALLATION
VAC Power Input Wiring:
Observe the POWER SUPPLY label on the LC52.
The label identifies the power requirement (120 or
240 VAC) and the terminal wiring. Note: Polarity
does not matter with the AC input terminal.
POWER SUPPLY
120 VAC, 50 - 60 Hz
L1
240 VAC, 50 - 60 Hz
L2
GND
N N
RELAY OUTPUT
250 VAC, 12 A, 1/2 Hp
C
LATCH
ON OFF
PROPORTIONAL
PWR
RELAY 1
INVERT
DELAY
Ground
Hot
Neutral
LATCH
ON OFF
PROPORTIONAL
PWR
RELAY 1
INVERT
DELAY
Ground
Hot
Neutral
LATCH
ON OFF
PROPORTIONAL
PWR
RELAY 1
INVERT
DELAY
RELAY 2
INVERT
DELAY
LATCH
ON OFF
PROPORTIONAL
PWR
RELAY 1
INVERT
DELAY
RELAY 2
INVERT
DELAY
Step Eight Step Nine
PROGRAMMING TROUBLESHOOTING
Factory Reset:
Returns the LC52 to its original factory set points,
including setting the OFFSET to 4 mA and the SPAN
to 20 mA. Hold both the 4/UP and 20/DWN buttons
when adding power to the LC52.
Factory Settings for the LC52 Controller
Lock Out Function:
Press both delay buttons and the DWN button to lock out all push button functions on the LC52. Press both delay buttons and the UP button to unlock all push button functions on the LC52.
Lock Out ON Lock Out OFF
Re-Span the LC52:
Do a factory reset of the LC52 (holding the [4] and [20] buttons while
adding power to the unit). Next set the level transmitter to send a 20
mA current. On the LU30-5003, set the EC20 to the level the LU30 is
currently reading. While a 20 mA current is being sent to the LC52,
adjust the R23 potentiometer until the display reads 20.0. Once completed, repackage and program the LC52 and return the EC20 value
on the LU30 back to its correct setting. Note: the R23 Potentiometer
can be reached by removing the front label of the LC52 and using a
long jewelers screwdriver to reach it. R23 is located underneath the
red LED on the LED bar graph approximately halfway down the
PCB. Use extreme caution when adjusting R23.
OFFSET:
Equivalent to the 4 mA set point on the transmitter. Enter the value
you would like to see when the LC52 receives 4 mA.
SPAN:
Equivalent to the 20 mA set point on the transmitter. Enter the value
you would like to see when the LC52 receives 20 mA.
RLY1, RLY2A, RLY2B:
Set points for Relays. Values must be between OFFSET and SPAN.
Setting values:
With the Latch Off, ignore steps 9 and 10. RLY2B will not show during the programming section with Latch Off.
1. Press the SET button once. Immediately, the LED bar
graph will begin to flash one Green bar next to OFFSET .
2. Use UP / DWN buttons to change display to the desired
OFFSET value.
3. Press the SET button again. Immediately, the LED bar
graph will jump one Green bar to the right next to SPAN.
4. Use UP / DWN buttons to change display to the desired
SPAN value.
5. Press the SET button again. Immediately, the LED bar
graph will jump one Green bar to the right next to RLY1.
6. Use UP / DWN buttons to change display to the desired
RLY1 value.
7. Press the SET button again. Immediately, the LED bar
graph will jump one Green bar to the right next to RL Y2A.
8. Use UP / DWN buttons to change display to the desired
RLY2A value.
9. Press the SET button again. Immediately, the LED bar
graph will jump one Green bar to the right next to RL Y2B.
10. Use UP / DWN buttons to change display to the desired
RLY2B value.
11. Press the SET button again. Immediately, the LED bar
graph will return back to it normal operation of solid bars.
EasyCal Calibration:
The Offset and Span points may be programmed directly to a specific level in the tank. These are the EasyCal 4 (EC4) and EasyCal 20
(EC20) values. Note: the level of the tank must physically be at its
desired level when using EasyCal. If not, the EasyCal will accept the
level and the values on the display will be incorrect. Use the factory
reset to start over if this occurs.
To calibrate EC4, set the tank to the
new Offset level. Press [4] button
once and [E] will appear in the display. Press [4] button again and [C]
will appear in the display and EC4
is set.
To calibrate EC20, set the tank to
the new Span level. Press [20] button once and [E] will appear in the
display. Press [20] button again and
[C] will appear in the display and
EC20 is set.
OFF SET
SPAN
RLY1
RLY2A
RLY2B
OFF SET
SPAN
RLY1
RLY2A
RLY2B
OFF SET
SPAN
RLY1
RLY2A
RLY2B
OFF SET
SPAN
RLY1
RLY2A
RLY2B
OFF SET
SPAN
RLY1
RLY2A
RLY2B
OFF SET
SPAN
RLY1
RLY2A
RLY2B
EC4 Level
4 20 OP
EASY CAL
UP DOWN SET
EC20 Level
4 20 OP
EASY CAL
UP DOWN SET
4 20 OP
EASY CAL
UP DOWN SET
OFFSET
4.0
SPAN
20.0
RLY 1
6.0
RLY 2A
18.0
RLY 2B
8.0
RELAY 1
INVERT
DELAY
RELAY 2
INVERT
DELAY
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
RELAY 1
INVERT
DELAY
RELAY 2
INVERT
DELAY
4 20 OP
EASY CAL
UP DOWN SET
INPUT
0% 100%
OFF SET
SPAN
RLY1
RLY2A
RLY2B
Step Ten Step Eleven
EXERCISE EXERCISE
The following exercise demonstrates inventory control with automatic filling and a high level alarm. The usable range is 60 inches of liquid. The pump starts filling at 10 inches of liquid and stops filling at
50 inches of liquid. Ahigh level alarm occurs at 55 inches of liquid.
Enter all values into the LC52 in inches. The OFFSET is the corresponding 4 mA setting in inches. The SPAN is the corresponding 20
mAsetting in inches. RLY2Aand RLY2B is dedicated to the filling of
the tank because RELAY2 is a latching relay. RLY1 is dedicated to
the high level alarm because it is a single set point relay. Use the following values for programming the LC52-1001.
The next exercise demonstrates the same inventory control with automatic filling and a high level alarm. However, the units have been
changes from inches to gallons. Within the tank, 1” = 50 gallons of liquid.The usable range is now 300 gallons of liquid. The pump starts filling at 50 gallons of liquid and stops filling at 250 gallons of liquid. Ahigh
level alarm occurs at 275 gallons of liquid.
OFFSET SPAN RLY1 RLY2A RLY2B
0.0 60.0 55.0 50.0 10.0
OFFSET SPAN RLY1 RLY2A RLY2B
0 300 275 250 50
Enter all values into the LC52 in gallons. The OFFSET is the corresponding 4 mA setting in gallons. The SPAN is the corresponding 20
mA setting in gallons. RLY2A and RLY2B is dedicated to the filling
of the tank because RELAY2 is a latching relay. RLY1 is dedicated to
the high level alarm because it is a single set point relay. Use the following values for programming the LC52-1001.
The following exercise demonstrates inventory control with a high
and low level alarm. The usable range is between 16 and 56 inches of
liquid. The high level alarm occurs at 50 inches of liquid and the low
level alarm occurs at 20" of liquid.
Enter all values into the LC52 in inches. The OFFSET is the corresponding 4 mA setting in inches. The SPAN is the corresponding 20
mA setting in inches. RLY1 is dedicated to the high level alarm
because it is a single set point relay. RLY2A is dedicated to the low
level alarm because the latch is turned off on Relay 2. Use the following values for programming the LC52-1001.
The next exercise demonstrates the same inventory control with a
high and low level alarm. However, the units have been changes from
inches to gallons. Along the straight side of the tank, 1” = 50 gallons
of liquid. The usable range is now from 50 to 250 gallons of liquid.
The high level alarm occurs at 220 gallons of liquid. The low level
alarm occurs at 70 gallons of liquid.
Enter all values into the LC52 in gallons. The OFFSET is the corresponding 4 mA setting in gallons. The SPAN is the corresponding 20
mA setting in gallons. RLY1 is dedicated to the high level alarm
because it is a single set point relay. RLY2A is dedicated to the low
level alarm because the latch is turned off on Relay 2. Use the following values for programming the LC52-1001.
20 mA = 300 gallons
4 mA = 0 gallons
Pump On = 50 gallons
Pump Off = 250 gallons
High Alarm = 275 gallons
20 mA = 250 gallons
4 mA = 50 gallons
Low Alarm = 70 gallons
High Alarm = 220 gallons
20 mA = 60" of liquid
4 mA = 0" of liquid
Pump On = 10" of liquid
Pump Off = 50" of liquid
High Alarm = 55" of liquid
20 mA = 56" of liquid
4 mA = 16" of liquid
Low Alarm = 20" of liquid
High Alarm = 50" of liquid
OFFSET SPAN RLY1 RLY2A
16.0 56.0 50.0 20.0
OFFSET SPAN RLY1 RLY2A
50 250 220 70
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