Flowline LC90 Remote Controller - Manual (Page 5)

Step Six Step Seven
INSTALLATION APPLICATION
VAC Power Input Wiring:
Observe the POWER SUPPLY label on the LC90
series. The label identifies the power requirement
(120 or 240 VAC) and the terminal wiring. Note:
Polarity does not matter with the AC input termi-
nal.
Relay Input Wiring:
The relay is a single pole, double throw type rated
at 250 Volts AC, 10 Amps, 1/2 Hp. The two ter-
minal NO and NC (normally open and normally
closed) will be used in different applications.
Remember that the "normal" state is when the
relay coil is de-energized and the Red relay LED
is Off / de-energized.
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. To change to 120 VAC, remove
jumper JW3 and place jumpers across JW1 and JW2.
4. Gently return PCB into housing and replace back panel.
Low Level Alarm
The goal is to make sure that the liquid level does not fall below a cer-
tain point. If it does, an alarm is supposed to sound, alerting the oper-
ator of a low level condition.
If power is accidentally cut to the controller, the sensor's ability to
notify the operator of a low level condition could be lost. The system
must alert the operator not only to low liquid 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 controller. If
power is lost, the relay will be de-
energized, 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 if the
tank will be wet, and the relay will be energized holding the alarm cir-
cuit open. Both the relay LED and the Input LED will be on simulta-
neously, so for this application, Invert should be set to the Off posi-
tion.
High Level Alarm
In the same manor, this system can be used to sound an alarm when
fluid reaches a high level, with just a change in the location of the sen-
sor 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
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 Input
LED is Amber. 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.
120 VAC
JWB JWA
J
W
C
240 VAC
JWB JWA
J
W
C
INPUT
120 VAC, 50 - 60 Hz
240 VAC. 50 - 60 Hz
L1 L2 ( )
RELAY OUTPUT
250 VAC, 10A, 1/2 Hp
NO NC
C
R E L A Y 1
P O W E R
- +
I N V E R T D E L A Y
Ground
Neutral
Hot
R E L A Y 1
P O W E R
- +
I N V E R T D E L A Y
Ground
Neutral
Hot
R E L A Y 1 R E L A Y 2
P O W E R
- + - +
I N V E R T D E L A Y I N V E R T D E L A Y
R E L A Y 1 R E L A Y 2
P O W E R
- + - +
I N V E R T D E L A Y I N V E R T D E L A Y