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LOCATION:    3.3 Models 170, 210   Pneumatic System Equipment (PSE) >   32 Pneumatic Test Program - Test (Orthopedic Seat Backrest)


Pneumatic Test Program - Test (Orthopedic Seat Backrest)

Preliminary work:
PSE control module voltage supply 23 PSE 1.0, 2.0
PSE Control Module Test 32 PSE

Data (mbar)

Test Procedure Permissible deviation
Allowable system leakage at 600 mbar pressure in 1 minute. 30 mbar

Preparation for Test:
1. Provide access to PSE control module (A37) and disconnect grey OSB pneumatic line with socket from PSE control module.
2. Connect tester to disconnected pneumatic line using connector
202 805 03 44.

Parts Required for Test:
1 Connector 202 805 03 44
2 Pneumatic hose, 50 mm long 007 997 61 82
1 Pneumatic line, 1 m long 000 158 14 35

Note:
The connections on the PSE control module and pneumatic multiple connector are marked with their German acronyms. In other words:
ZV (German) = CL (English),
SRU (German) = MVA (English),
OSL (German) = OSB (English).



Test scope Test connection Test condition Nominal value Possible cause/Remedy
1.0 Complete multi-contour backrest system
Lower OSB center insert
Yellow connector
on tester.
Set pressure adjuster for lower OSB center insert to maximum.
Set pressure adjuster for upper OSB center insert and seat cushion length to minimum.
Set side bolster rocker switch to minimum.
Apply 600 mbar pressure in each of the 3 height settings.
Pressure loss
30 mbar in
1 minute.
5.0-9.0
2.0 Complete multi-contour backrest system
Upper OSB center insert
Yellow connector
on tester.
Set pressure adjuster for upper insert to maximum.
Set pressure adjuster for lower OSB center insert and seat cushion length to minimum.
Set side bolster rocker switch to minimum.
Apply 600 mbar pressure in each of the 3 height settings.
Pressure loss
30 mbar in
1 minute.
5.0-9.0
3.0 Complete multi-contour backrest system
Side bolster
Yellow connector
on tester.
Set side bolster rocker switch to maximum.
Set pressure adjuster for lower and upper OSB inserts and seat lengthen to minimum.
Apply 600 mbar pressure in each of the 3 height settings.
Pressure loss
30 mbar in
1 minute.
5.0-9.0
4.0 Complete multi-contour backrest system
Seat cushion length
Yellow connector
on tester.
Set pressure adjuster for seat cushion lengthen to maximum.
Set pressure adjuster for lower and upper OSB center insert to minimum.
Set side bolster rocker switch to minimum.
Apply 600 mbar pressure in each of the 3 height settings.
Pressure loss
30 mbar in
1 minute.
5.0-9.0

Preparation for Test:
1. Connect tester to the grey OSB pneumatic line which leads to either the pressure reservoir below the rear seat cushion or to the control valve, using connector 202 805 03 44.
Notes:
When testing the pneumatic lines with the pressure reservior, cap the pneumatic lines which lead to the control valves.
When testing the pneumatic lines with control valves, disconnect the pneumatic line at pressure reservior and cap using
connector 124 805 02 44.

The disconnected pneumatic lines are to be reconnected to the distributor with connector 007 997 61 82.

Parts Required for Test:
1 Connector, 50 mm long 007 997 61 82
1 Connector 202 805 03 44
1 Cap 000 987 11 45
2 Connector 124 805 02 44

Test scope Test connection Test condition Nominal value Possible cause/Remedy
5.0 Line and pressure reservoir Yellow connector
on tester.
Apply 600 mbar pressure to line and pressure reservoir. Pressure drop
5 mbar in
1 minute.
32 8.0,
Pressure reservoir leaks. Replace reservoir.
6.0 Line and control valve Yellow connector
on tester.
Set pressure adjusters as well as rocker switch at control valve to mimmum.
Apply 600 mbar pressure to line and control valve.
Pressure drop
5 mbar in
1 minute.
32 7.0-8.0

Preparation for Test:
1. Connect tester to separation connection underneath seat.

Parts Required for Test:
1 connector 202 805 03 44
2 Rubber hose, 50 mm long 007 997 61 82
1 Pneumatic line, 1 m long 000 158 14 35


Test scope Test connection Test condition Nominal value Possible cause/Remedy
7.0 OSB control valve pressurized in each of the 3 height positions
Yellow connector
on tester.
Set pressure adjusters and rocker switches to minimum.
Apply 600 mbar pressure to pressure regulator.
Pressure drop
5 mbar in
1 minute.
Control valve or pneumatic line to control valve leaks.
Replace.

Preparation for Test:
1. Connect tester to one end of pneumatic line and plug other end with cap, part no. 000 987 11 45.

Parts Required for Test:
1 Cap 000 987 11 45
1 Rubber hose, 50 mm long 007 997 61 82
1 Connector 202 805 03 44
1 Connector 124 805 02 44




Test scope Test connection Test condition Nominal value Possible cause/Remedy
8.0 Leakage while pressurized Yellow connector
on tester.
Apply 600 mbar pressure
to lines.
Pressure drop
0 mbar in
1 minute.
Pneumatic line with connectors leak.
Replace.

Preparation for Test:
1. Provide access to connector between control valve and pneumatic lines.

Parts Required for Test:
1 Rubber hose, 50 mm long 007 997 61 82
1 Pneumatic line, 1 m long 000 158 14 35


Test scope Test connection Test condition Nominal value Possible cause/Remedy
9.0 Air cushion and pneumatic line leakage in side bolster or seat cushion Yellow connector
on tester.
Apply 200 mbar pressure individually to each line in the pneumatic harness.
Pressure drop
5 mbar in
1 minute.
Air cushion and pneumatic line in side bolster or seat cushion leak.
Replace.