Trane R Series Diagnostic Troubleshooting Repair page 75

Table 22 Compressor Module Normal Terminal Voltages (1 U4 and 1 U5)
Terminal Description
Designation of Circuit
J1-4 to 3 IPC Communications
or J1-2 to 1
J2-2, 1 Manufacturing Address Use
Only
J3-7 , 6 External Circuit Lockout
J3-4, 3 Transition Complete
J3-2, 1 Not Used
J4-5, 4 Saturated Condenser
Refrigerant Temp
J4-3, 1 Entering Oil Temperature
J5-7 , 6 Phase A Current
Transformer Input
J5-5, 4 Phase B Current
Transformer Input
J5-2, 1 Phase C Current
Transformer Input
J6-1 or 2 Input Power
to J6-4 or 5
E3, E4 Compressor Motor
Winding Temp
Thermostat.
E5 to High Pressure
J6-4 or 5 Cutout Input
E5, J7-3 Compressor Contactor
Output
J7-1, E6 Crankcase Heater Output
J7-5,6 Transition Command Output
RLC-SVD03A-EN
Module Power and Miscellaneous I/O
I/O Terminals
For the checkout of the I/O, refer to the block diagram of the MCSP module in
Figure 22 and the Chiller Wiring Diagrams for both high and low voltage
circuits. All voltages are measured differentially between terminal pairs
specified unless otherwise indicated. The first terminal in the pair is the
positive (or hot) terminal. Voltages given are nominals and may vary by ±5%.
Unregulated Voltages (unreg) or 115 VAC voltages may vary by ±15%.
Normal Terminal Voltages
for Various Conditions
19.2 kbaud serial data, 5 volt signal level.
Refer to Interprocessor Communication Interface.
+5 VDC No connection intended.
Open = 12 VDC: ckt lockout
Closed 0 VDC: normal
(ckt. lockout' only if feature is enabled in Service Settings)
Must be jumpered if this feature is not used.
Open = 12 VDC: pre-transition
Closed = 0 VDC: transition complete
(only used with reduced voltage starters)
Must be jumpered.
Refer to Temperature Sensor Checkout.
Refer to Temperature Sensor Checkout.
Input for 100-400:0.1 Ratio CT using digital VOM
in diode test mode open circuit input should read between 1.0 to 1.5
Volts.
Refer to Current Transformer Checkout.
Same as above.
Same as above.
115 VAC, Refer to Power Supply in Module.
Power and Miscellaneous I/O.
Internally powered Isolated input.
Open = 16 Vac: high temp
Closed = 0 Vac: Ok temp
Externally powered isolation transformer input,
2 VA, 115 Vac 115 volts input: normal 0 volts: trip
Normally open contact, closes for compressor start
Uses same power input as High Pressure Cutout input above.
Normally closed contact, powers crankcase heater when compressor is
off.
Normally open contact, closes to initiate Wye to Delta Starter transition if
configured for Reduced Voltage start.
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