8–23
62-11785
b. Diagnostics - Stepper Motor
The valve stepper motor may be tested using a stepper motor drive tester or ohmmeter.
1. To test with a stepper motor drive tester (Carrier
Transicold P/N 07-00375-00SV), connect the 5
pin test cable to the valve connector (see
), and the cable wires to the tester in accor-
dance with wire and terminal color. (if a 5 pin
tester cable is required, order Carrier Transicold
P/N 07-00375-11.)
2. 2. Set the step rate to 50 steps per second and
either open or close the valve. Each red LED
should light sequentially until all four are
illuminated. Any LED failing to illuminate indicates
an open on that leg and a need to replace the
drive.
3. 3. To test with an ohmmeter, check the winding
resistance between connector pin A & E, B & E, C
& E and then between D & E. In normal ambient,
the resistance between the pins should be 46
ohms. If an infinite or zero reading is observed,
the piston and drive motor assembly is to be
replaced.
Figure 8.13 Evaporator Expansion Valve
c. Diagnostics - Valve
If the valve failed Pre-trip and passed the preceding diagnostic testing, this is an indication that the valve internal
mechanism is damaged and the piston and motor assembly is to be replaced.
Test the EVXV valve internal mechanism:
1. Install a manifold gauge set on the suction service valve and a stepper motor drive tester. Refer to
NOTICE
The scroll compressor achieves low suction pressure very quickly. Do not use the compressor
to evacuate the system below 0 psig. Never operate the compressor with the suction or
discharge service valves closed (frontseated). Internal damage will result from operating the
compressor in a deep vacuum.
2. Start the unit, set the step rate to 150 steps per second, open and close the valve while watching the suction
pressure. Within one minute the suction pressure should begin to fall.
3. If the suction pressure does not change, this is an indication the valve is stuck and the piston and drive motor
assembly is to be replaced.
Test the ECXV valve internal mechanism:
1. To test the ECXV, install a stepper motor drive tester to the valve, refer to
2. Use the stepper motor drive tester to close the ECXV completely, and run the unit for 5 minutes.
3. Check for a temperature change through the valve. If there is a temperature change, it indicates that the ECXV
is stuck open and needs to be replaced. If there is not a temperature change, record the CDT and AC current
from Unit Data.
4. Use the stepper motor drive tester to open the ECXV, and run the unit for 5 minutes.
5. Check for a temperature change through the valve, if there is a temperature change, it indicates that the ECXV
opened correctly.
6. From Unit Data, make sure the CDT temperature reading went down, and that the AC current draw went up.
A
B
B
A
PIN A (ORANGE)
PIN B (RED)
PIN C (YELLOW)
PIN E (GRAY)
PIN D (BLACK)
COMMON
(+12VDC)
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