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12
mainTenance
WarnIng
risk of injury due to improper installation and maintenance.
▶ Only trained technicians may perform installation and main-
tenance work.
▶ Perform installation and maintenance work with suitable
tools only.
risk of injury due to unintentional activation and uncon-
trolled start-up of the system.
▶ Secure system against unintentional activation.
▶ Ensure that the system does not start up in an uncontrolled
manner.
12.1
Replace valve
Danger
risk of injury due to pressure change.
Actuators can change their position due to pressure change
which may result in injury or material damage.
▶ Before working on the device or system, secure the actua-
tors against moving.
risk of injury due to high pressure at pneumatic base
modules without P shutoff.
Suddenly escaping pressure medium can quickly accelerate
components (hoses, small parts ...) resulting in injuries and
material damage.
▶ Before working on the device or system, switch off the pres-
sure. Vent or drain lines.
32
english
Type 8647
Maintenance
risk of injury due to pressure change at pneumatic base
modules with P shutoff.
When the valve is removed, only the P channel is shut off. As
a result, the existing pressure at the outputs A or B is released.
An interconnected actuator is thus also depressurized, which
may result in actuator movement.
▶ Before working on the device or system, secure the actua-
tors against moving.
Pneumatic base modules with "P shutoff":
If the pneumatic base module in question is equipped
with "P shutoff" (marked at the module), a valve can also
be replaced when supply pressure is present.
When the valve is removed, a relatively large amount of air is ini-
tially blown into the open for functional reasons until the required
pressure difference is reached. Due to the automatic shutoff,
residual leakage is reduced to a minimum and the remaining
valves of the valve block can still operate.
It is not recommendable to remove several valves from the pneu-
matic base module at the same time.
CauTIon
risk of injury due to hot device components.
A longer duty cycle may result in the valves becoming hot.
▶ Let the valves cool down before removing them or wear
protective gloves.
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