Module power and miscellaneous i/o – Trane RTWA 70-125 TON User Manual
Page 71
RLC-SVD03A-EN
71
Module Power and Miscellaneous I/O
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%.
Table 21
EXV Module Normal Terminal Voltages
Terminal
Designation
Description
of Circuit
Normal Terminal Voltages
for Various Conditions.
J1-4 to 3
or J1-2 to 1
IPC Communications
19.2 kbaud serial data, 5 volt signal level.
Refer to Interprocessor Communication Link (IPC).
J2-2, 1
Manufacturing
Address Use Only
+5 VDC No connection intended.
J3-9, 8
Saturated Evap.
Rfrg. Temp. CKT 1
Refer to Temperature Sensor Checkout.
J3-7, 6
Compressor Suct.
Rfrg. Temp. CKT 2
Refer to Temperature Sensor Checkout.
J3-4, 3
Saturated Evap.
Rfrg. Temp. CKT 2
Refer to Temperature Sensor Checkout.
J3-2, 1
Compressor Suct.
Rfrg. Temp. CKT2
Refer to Temperature Sensor Checkout.
J4-5
1
EXV CKT1 GND
OVDC GND.
J4-3
1
EXV CKT1 Phase 1
Between 0 and 1 VDC when the phase is not being stepped. When
the valve is being stepped, this signal is actually a 24.2±17% VDC
peak square wave with a period of 60 msec and a 1/3 duty cycle
low (On) and 2/3 duty cycle high (Off). An averaging DC voltmeter
can be used to measure this voltage. The meter will show fluctua-
tions but the average should be approximately 8 volts.
J4-2
1
EXV CKT1 Phase 2
J4-1
1
EXV CKT1 Phase 3
J5-6
1
EXV CKT2 GND
OVDC GND.
J5-4
1
EXV CKT2 Phase 1
Same a CKT 1.
J5-2
1
EXV CKT2 Phase 2
Same as above.
J5-1
1
EXV CKT2 Phase 3
Same as above.
J4-1, 2, 4,5
2
EXV CKT 1
10-12 VDC
J4-1, 2, 5, 6
2
EXV CKT 2
10-12 VDC
J6-1 or 2
to J6-4 or 5
Input Power
115 VAC, Refer to
J7-5, 4
Low Pressure
Switch, Circuit 1
Open = 12 VDC, Low Pressure Cutout
Closed = 0 VDC, Normal
J7-2, 1
Low Pressure
Switch, Circuit 2
Open = 12 VDC, Low Pressure Cutout
Closed = 0 VDC, Normal
Note: On a power up or a front panel reset, the valve will always be driven closed for approximately 1000 steps. During this time,
approximately 40 seconds, an alternating audible clicking sound can be observed on the valves
1
SEO Valve
2
SEHI Valve