10-20
180788-1CD
HW1484370
10 Maintenance and Inspection
10.3 Inspection of the Explosion-Proof Device
MPX2600
10.3.1.4 Operation Check of Pressure Detection Function
Check the operation of the pressure detector PS1 (for low pressure) and
pressure adjusting valve by following the procedures.
Operation check of pressure detector PS1
(check of electric continuity)
Multimeter for this checking are prepared by customer.
1. Turn OFF the power supply to the DX200.
2. Unscrew the hexagon socket head cap screws to remove the pressure
unit cover. (Refer to
Fig. 10-10 “Pressure Switch Unit Cover”
.)
3. Set the pressure of both purging air and operation air reducing valves
as shown in
Table 10-10 “List of Setting Value for Pressure Reducing
Valve for Purging Pressure and OperatingPressure”
Refer to
section 10.3.1.2 “Operation Method of Pressure Reducing
for the pressure reducing valve operation.
4. Remove the clear cover from the pressure switch unit terminal box,
and then connect a metering rod which is a multimeter. To P1, connect
+ side of the metering rod and - side to N1. (Refer to
“Operation Check for Pressure Detector”
.)
5. Confirm that “conduction is not produced” after suspending the
industrial air.
6. Also, confirm that “conduction is produced” while industrial air is
provided.
7. Remove the metering rod, and then re-install the clear cover to the
pressure switch unit terminal box.
8. Re-install the cover with the hexagon socket head cap screws. (Refer
to
.)
Table 10-10: List of Setting Value for Pressure Reducing Valve for Purging
Pressure and OperatingPressure
Pressure [MPa]
Pressure reducing valve
for purging pressure
0.18 to 0.20
Pressure reducing valve
for the operating pressure
0.01 to 0.02
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