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Application
Engineering
Application
Engineering
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August 2010
Copeland® Sentronic 3™ Electronic Oil Pressure Control
The Sentronic 3™ oil pressure safety control replaces
mechanical devices, the current Sentronic +™ as well as
older versions of the Copeland® Sentronic® oil pressure
control. The Sentronic 3 control offers the following
features:
Specifications
Cap Tube Elimination
Sentronic 3 continues to add system reliability by
removing the traditional cap tube oil pressure controls
that are prone to refrigerant leaks.
Precise Timing
Oil Pressure
Cut Out
Cut In
7-9 PSID
12-14 PSID
Module
Time Delay
Power
120 seconds +/- 15 seconds
120/240V 500VA
Sensor Switch
Torque
60-65 ft-lb.
Wiring
Insufficient oil pressure time for the compressor is
stored and accumulated in the module memory.
Once the total time accumulated for bad oil pressure
exceeds 120 seconds, the module will shut the
compressor off.
The Sentronic 3 wiring remains the same as previous
versions. There are several wiring schemes depending
on control circuit components. Sample wiring diagrams
are shown on the following page:
Diagram (1A)
LED Diagnostics
Standard control circuit
Sentronic 3 LED codes are designed to match
Copeland® Sentronic + and Sentronic.
Diagram (1B)
•
Diagram (1C)
•
•
Standard control with added alarm circuit
LED GREEN
Compressor has sufficient oil pressure.
Standard control with alarm and current sensing
relay circuit
LED RED
Compressor has experienced insufficient oil
pressure and will trip after two minutes.
Diagram (1D)
Standard control with alarm, current sensing relay
and separate control voltage
NO LIGHT
If switch is in the trip state, the module has
tripped due to low oil pressure. If switch is in
the Reset/On position, the compressor is at the
normal off condition.
Oil Pressure Reset
When oil pressure is "good" the latch is in the "Reset
ON" position. If the oil pressure falls below 7-9 psi
for over 120 seconds, the switch will default to the
"Trip OFF" position and the compressor will shut off.
To restart, move the latch to the "Reset ON" position.
(See Figure 1.)
Note! Moving the latch from "Reset ON" to "Trip
OFF" and back to "Reset ON" can also be used to
"jog" the compressor.
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
Figure 1
Sentronic 3 Trip and Reset Switch
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L1
USE EITHER 120V
OR 240V TERMINAL
USE EITHER 120V
OR 240V TERMINAL
L1 L2 L3
SENTRONIC
SENTRONIC
TIMING
CIRCUIT
2
L2
2
M
M
CC CC CC
OPERATING
AND LIMIT
CONTROLS
OPERATING
AND LIMIT
CONTROLS
MOTOR
L
TIMING
CIRCUIT
L
A
A
A
CC
A
SENSOR
= ADDED ALARM LIGHT
CC
CC = COMPRESSOR CONTACTOR
Diagram 1A
Diagram 1B
120V TERMINAL
L1
L2
TIMING
CIRCUIT
USE EITHER 120V
OR 240V TERMINAL
CS
2
SENTRONIC
(N.O.)
TIMING
2
M
OPERATING
AND LIMIT
CONTROLS
CC CC CC
XFMR
L3
CIRCUIT
CC
CC
LL 1
CC
LL 2
SENTRONIC
CC
M
CS
RR
OPERATING
AND LIMIT
CONTROLS
MOTOR
L
L
AR
A
MOTOR
A
SENSOR
CS = CURRENT SENSOR
CC
A
Diagram 1C
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
AR = ALARM RELAY
RR = REMOTE RELAY
CC = COMPRESSOR CONTACTOR
XFMR = CONTROL TRANSFORMER
Diagram 1D
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START-UP QUICK CHECKS
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INTERCHANGEABILITY OF SENTRONIC AND
SENTRONIC 3 MODULES AND SENSORS
Checking the Sensor
Unplug the sensor and start the compressor. The
Sentronic module LED should be red. Simultaneously
measure the oil pump pressure vs. crankcase pressure.
Monitor the two terminals at the back of the sensor with
an ohmmeter. If the differential pressure is below the
range of 7 to 9 PSID, the sensor circuit should be open.
If the pressure is above 12 to 14 PSID, the sensor circuit
should be closed.
The new Sentronic 3 oil pressure control uses both
a new module and a new sensor. The sensors and
module can be made compatible with older generation
components if the following steps are taken:
The sensor is manufactured with hysteresis between the
cut out and cut in pressures. If the sensor is closed the
pressure must fall below the cut out threshold before
it opens. If the sensor is open the pressure must rise
above the cut in threshold before it will close.
Option 2: To use the Sentronic module with a
Sentronic 3 sensor, the new Sentronic 3 sensor cable
must be wired to the Sentronic module.
Option 1: To use a Sentronic 3 module with a
Sentronic sensor, the original Sentronic sensor cable
must be wired to the new Sentronic 3 module.
Checking the Installed Sentronic 3 Module
•
Unplug the sensor, the LED should be solid red.
•
The module keeps track of running time without oil
for up to 120 seconds and retains this information
even when the compressor is powered down. After
the module records that the compressor has been
powered on for 120 seconds (+/- 15 seconds) without
oil, the L-M contact should open and shut off the
compressor.
Sentronic + and Sentronic 3
Sentronic
Figure 3 – Sensors
Option 1 - Connecting the Sentronic 3 module to an
older Sentronic sensor:
Removing the cable from the old Sentronic
module:
1. Disconnect power to the old module.
2. Disconnect the cable from the sensor.
3. Remove the cover from the old module.
4. Remove the two flag connectors from the circuit
board (these are the orange and red wires).
5. Using pliers, squeeze the strain relief slots and
pull to remove the cable from the module.
6. Remove the old module from the compressor
by loosening the two module screw from the
bracket. Save these for reuse in the installation
of the new module.
STRAIN
RELIEF
BUSHING
Removing the cable from the new Sentronic 3
module:
1. Remove the cover from the Sentronic 3 module.
2. Pull the 2 flag connectors from the circuit board
(these are the orange and red wires).
3. Push the tabs in on the strain relief to disengage
the harness from the plastic module.
4. Remove the wires from the strain relief and
from the module.
Figure 2 – Sentronic 3 Module
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
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Connecting the Sentronic cable to the Sentronic
3 module:
Removing the cable from the Sentronic module:
1. Feed the wires into the module through the
hole in the bottom of the case and insert the
old cable into the strain relief.
2. To remove the two flag connectors from the
circuit board, use pliers to squeeze the strain
relief slots and pull to remove the cable from
the module.
1. Remove the cover from the old module.
2. Leaving enough lead length to reach the quick
connects, place the wires in the strain relief
bushing and snap the bushing closed.
Connecting the new cable to the old module:
1. Feed the wires into the module through the hole
in the bottom of the case.
3. Align the "D" slot of the strain relief to the plastic
housing and snap it into place.
2. Push the strain relief into position to lock it into
place.
4. Connect the orange and red wires that have
flag connectors onto the circuit board spades.
(Note: the connections may be interchanged;
there is no polarity on these wires.)
3. Connect the two flag connectors to the circuit
board. There is no polarity on the leads.
5. Replace the cover and tighten the screws.
4. Replace the cover.
6. Install the module to the compressor and make
wiring and sensor connections per the general
instructions.
5. Install the module on the compressor and make
wiring and sensor connections per the general
instructions.
Sentronic 3 Terminal Strip
Option 2 - Connecting the old Sentronic module
to a newer Sentronic 3 sensor:
•
The Sentronic 3 module terminal strip is
designed to accept a bare wire end or a spade
terminal.
•
If a Sentronic 3 module is being retrofitted to a
system with spade connections, the spade may
be clipped off and ¼” of the wire end stripped.
Or, one leg of the spade may be clipped off for
insertion into the terminal strip.
Removing the cable from the new Sentronic 3
module:
1. Remove the cover from the Sentronic 3 module.
2. Pull the 2 flag connectors from the circuit board
(these are the orange and red wires).
3. Push the tabs in on the strain relief to disengage
the harness from the plastic module.
4. Remove the wires from the strain relief and
from the module.
© 2010 Emerson Climate Technologies
Printed in the U.S.A.
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