8-34
62-11039
O
P
Winding #1
Winding #2
P
E
N
1A
1B
2A
2B
N
1
+12V GRD +12V GRD
2
GRD +12V +12V GRD
C
L
3
GRD +12V GRD +12V
L
O
S
4
+12V GRD GRD +12V
S
E
Each winding has a resistance of about 75
Ω
.
There is no common connection point between the two
windings.
The reason this coil design is bipolar is that the
microprocessor causes the valve to open by energizing
the windings in a particular sequence
and
by reversing
the polarity of the current through the windings in a
specific sequence.
Energizing the windings with the correct polarity, in the
correct sequence, rotates the rotor and causes the
valve to open one step.
1
2
1A (BLK)
2A (GRN)
(WHT) 1B
(RED) 2B
Figure 8--35 CSMV Coil (Bi--Polar Design)
8.23.2 CSMV Diagnostics
If the SMV is suspected to be faulty, the first thing the
operator should do is perform a unit Pretrip (Refer to
Section 3.5). Some symptoms that could indicate a
faulty SMV are:
S
Unusually high suction pressure in COOL mode.
A27 -- High Suction Pressure Alarm may be gen--
erated.
S
Unusually low suction pressure
A18 -- Low Refrigerant Alarm may be generated
S
Poor temperature control
Box temperature deviates from setpoint.
If the unit fails Test 10 during pretrip,
(P180 CHECK SUCTION MOD VALVE) the SMV could
be faulty. The SMV could have become mechanically
jammed, or it could have failed electrically in the power
head, or it may not be receiving the proper signal from
the micro. There are several steps the operator should
make in addition to the unit Pretrip to further diagnose
the valve.
1. The SMV may be stuck in some position other than
completely closed and the stepper motor cannot
move the piston. To check if the valve is stuck, first
start the unit and run in cool mode with manifold
gauges attached to the compressor
2. Allow the suction pressure to pull down to 0 PSIG/
Bar.
WARNING
Carrier Transicold does not recommend al-
lowing the compressor to pull less than 0
PSIG/Bar at any time.
3. Once the unit has reached suction pressure of 0
PSIG/BAR, switch the unit to OFF using the SROS.
After the engine shuts down, the microprocessor will
fully close the SMV.
NOTE
Carefully listen to the valve. When the unit is off
and the valve is closing, the valve will make a
ratcheting noise that may be heard or felt as it is
closing. If this can be heard or felt, it indicates
that the microprocessor is
attempting
to close
the valve, and may serve as a quick indication
that the drive module is in working order. It is
not, however, an indication that the valve piston
is actually working.
4. Wait about 2 minutes after the engine stops to en-
sure the valve is fully shut.
5. If the SMV is fully shut, the suction pressure should
still read 0 PSIG/Bar. If the valve is stuck at some
position other than fully closed, or it cannot fully close
for any reason, the suction pressure during this test
will rise.
a. If the suction pressure holds to 0, go to Step 6.
b. If the suction pressure rises, go to Step 7.
6. Use the Stepper Motor Tester (CTD special tool P/N
07--00375--00) to manually open the valve. The suc-
tion pressure on the manifold gauge should go up. If
the suction pressure does not go up, the SMV is
stuck closed (go to Step 7.) or there is something ob-
structing the refrigerant.
NOTE
Opening the valve can also be accomplished by
using the microprocessor. Place the SROS in
the Start/Run position. The microprocessor will
go through its self test and the display will show
“SMV CLOSING”.
The valve is obviously
closed at this point, but the microprocessor still
has to “home” the SMV valve every time the mi-
croprocessor is powered up.
The display will
then show “SETTING SMV XX%” . Refer to
8.23 above. If the suction pressure does not go
up, the SMV is stuck closed (go to Step 7.) or
there is something obstructing the refrigerant.
NOTE
If the valve passes steps 1. through 6., the valve
is operating properly.
Содержание VECTOR 1800 MT
Страница 1: ......
Страница 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
Страница 19: ...1 5 62 11039 1 3 SAFETY DECALS ...
Страница 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
Страница 21: ...1 7 62 11039 ...
Страница 303: ...10 1 62 11039 ...
Страница 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Страница 311: ...10 9 62 11039 FROM PREVIOUS SHT ...