76 of 132
M-SV-001-EN Rev.E
Compressor Components
3.15.2.1 Compressor
Interface Module
Connection Descriptions
J1 – RS-485 communication port
• Jumper JP2 required at end of Modbus line.
J2 – Input/output
• DEMAND – Pin 1 & 2 – Analog input to drive
compressor (0-10V).
• I/LOCK – Pin 3 & 4 – Interlock safety switch: must
be part of a closed circuit to start compressor.
• STATUS – Pin 5 & 6 – Output; closed circuit:
compressor in normal operation; open circuit:
compressor in alarm condition.
• SPEED – Pin 7 & 8 – compressor motor speed
output (0-5V = 10,000 RPM/volt).
• LIQT – Pin 9 & 10 – Liquid temperature sensor
input.
• Refer to the Applications Manual for thermistor
specifications.
J3 – Input/output
• RUN – Pin 1 & 2 – compressor running indicator
output. Normally Open, closes when RPM reaches
specified RPM set in BMCC.
• ANALOG – Pin 3 & 4 – Output dependent on
BMCC setting. 0-5V or 0-10V set by jumper JP1.
• ENTRY – Pin 5 & 6 – Entering chilled fluid
temperature sensor input.
- Use ENTRY jumper when no sensor connected.
- Refer to the Applications Manual for thermistor
specifications.
• LEAVE – Pin 7 & 8 – Leaving chilled fluid
temperature sensor input.
- Use LEAVE jumper when no sensor connected.
- Refer to the Applications Manual for thermistor
specifications.
J4 – EXV 1 & EXV 2 Control – 15V output
• EXV1 – Pin 6 to 9
• EXV2 – Pin 1 to 4
J5 – Liquid Level input
• LIQ LEV 1 – Pin 4 to 6 – Liquid level sensor
driving the electronic expansion valve1 (EXV1).
• LIQ LEV 2 – Pin 1 to 3 – Liquid level sensor
driving the electronic expansion valve2 (EXV2).
• Refer to the Applications Manual for further
information.
• Jumpers JP5 (LIQ LEV 1) & JP6 (LIQ LEV 2)
- For use with a voltage-type level sensor (with
15V supply and 0-5V signal).
- Install jumpers between LVL pins 2a and 3a, and
Pins 2b and 3b.
- Connect the sensor leads to the “+,” “S,“ and
“-“ terminals on the Compressor I/O Board
(consult vendor documentation for sensor lead
identification).
- For use with a resistive-type float sensor
- Install jumpers between LVL Pins 1a and 2a, and
Pins 1b and 2b.
- Connect the sensor leads to the “-” and “S”
terminals on the Compressor I/O Board.
- When using Superheat Control (no sensor
connected)
- Install jumpers between LVL pins 2a and 3a, and
Pins 2b and 3b.
J6 – RS-232 I/O Cable connection.
Communication port with Backplane.
J7 – RS-232 external communication port
• Use jumper JP7 only to supply power at the
9-pin connector when using the Firefly Bluetooth
serial adapter.
J8 – External sensor inputs
• Spare T: External temperature sensor input
Summary of Contents for Turbocor TT-300
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