
6270A
Service Manual
12
When the module bay door is opened, the system vents and releases the supply
pressure. There may be a small residual pressure retained between solenoids IS
and CS, see Figure 1. This pressure could be up to150 psi after the supply is
removed. Loosen the PCM screws to safely release this pressure.
Table 2 shows the typical state of solenoids in Figure 1 during different operating
conditions. There are additional states as the system transitions between various
operational modes.
Note
The status of the measure slot solenoids is dependent on the type of
module. For example, if the PMM is an absolute model then the test
port solenoids (nT) opens and the reference port solenoid (nR)
closes since inside the module there is no connection to the
reference port.
Table 2. Solenoid States
6270A
Main Manifold
Control Module
Isolation
Manifold-
External
Option
Phase
B1-
1T
G1-
1R
B2-
2T
G2-
2R
B3-
3T
G3-
3R
B1-
4T
G1-
4R
B2-
5T
G2-
5R
B3-
VT
G3-
VR
B4-
IS
CS CE IT
Power Off
C C C C C C C C C C C C C C
C
C
Power On
C C C C C C C C C C C C C C
C
O
Measure Slot 1*
O O
C C C C C C C C C C C C
C
O
Measure Slot 2*
C C
O O
C C C C C C C C C C
C
O
Measure Slot 3*
C C C C
O O
C C C C C C C C
C
O
Measure Slot 4*
C C C C C C
O O
C C C C C C
C
O
Measure Slot 5*
C C C C C C
C C O O
C
C
C
C C O
Control Apply
pd pd pd pd pd pd pd pd pd pd C C
O
modulate C
O
Control Exhaust
pd pd pd pd pd pd pd pd pd pd C C
O
C modulate
O
Zero
O O O O O O O O O O O O C C
C
C
Vent - final state
O O O O O O O O O O O O C C
C
O
Door open final
state
O O O O O O O O O O O O C C
C
C
Slot PCM - Empty
C C C C C C C C C C C C C n/a
n/a
C
*O = OPEN, C = CLOSED, pd = product configuration dependent
Summary of Contents for 6270A
Page 6: ...6270A Service Manual iv...
Page 26: ...6270A Service Manual 20 2 1 3 hxn212 eps Figure 7 PMM and PCM Removal...
Page 30: ...6270A Service Manual 24 1 2 3 hxn205 eps Figure 9 Manifold Installation...
Page 32: ...6270A Service Manual 26 2 1 1 hxn202 eps Figure 10 Remove Feet and Tilt Stands...
Page 40: ...6270A Service Manual 34 hxn208 eps Figure 16 Remove the CPU...
Page 43: ...Pressure Controller Calibrator Module Guide Rails 37 8 9 10 hxn219 eps Figure 18 Dock Assembly...
Page 64: ...6270A Service Manual 58 1 2 3 4 5 7 6 hxn210 eps Figure 32 Remove Latch Assembly...
Page 67: ...Pressure Controller Calibrator PCM Assembly 61 2 1 hxn401 eps Figure 34 Module Components...