F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-48
Some relays may require a current limiting resistor to keep from shorting the power supply
through the relay coil. Many relays have a built in current limiting circuit. It is the responsibility
of the control system designer to choose proper relay components.
Proflo PF1 - Using PLC to Calculate Oil Consumption:
Using the blue wires or the pulse output, it is possible for the control system to calculate the
amount of oil the system uses. Following is an example of how to do this.
0.144 x 0.0346 = 0.004987 pints/cycle
Blocks are numbers stamped into the divider blocks mounted on the compressor.
Block numbers divided by 1000 = volume, In
3
(cubic inches).
x 2 are for each block moving in 1 full cycle.
0.0346 is the conversion from in
3
to pints, US liquid (pints/in
3
).
(Divide pints by 8 = gallons, US liquid)
(Multiply gallons (US liquid) X 3.78541 = liters)
(Multiply pints (US liquid) X 0.47318 = liters)
The above calculation can be entered as a constant for each Proflo PF1.
The PLC can then calculate a running total by adding 0.00497 pints, in this example, to a to-
F
IGURE
4-19 E
XAMPLE
D
IAGRAM
TO
R
EAD
B
OTH
P
ULSE
& A
LARM
C
ONTACTS
- U
SING
R
ELAYS
T
ABLE
4-13 E
XAMPLE
DIVIDER
BLOCK
:
BLOCKS
IN
3
X 2
12T
0.012
0.024
18T
0.018
0.036
18T
0.018
0.036
6S
0.006
0.012
18T
0.018
0.036
Proflo PF1
Blue
GND
+V
Red
Blue
Optical
Iso
control
line
power
mosfets
Reverse
Polarity
circuits
Reverse
Polarity
circuits
power
mosfets
control
line
Mounted on Compressor,
Outputs are not isolated
Red
PLC inputs do
not have to be
isolated
Relays
Provide
Isolation
Ch 2
Ch 1
PLC
Relay
Relay
