Burkert Type 8791 - Manual (Page 49)

49
Fluid connection
procedure:
→
Apply supply pressure (1.4 – 7 bar) to the supply pressure connection P.
for single-acting actuators (control function a and B):
→
Connect one working connection (A1 or A2, depending on required safety position) to the chamber of the
single-acting actuator.
Safety positions see chapter “8.7. Safety positions after failure of the electrical or pneumatic auxiliary power”.
→
Seal a working connection which is not required with a plug.
for double-acting actuators (control function i):
→
Connect working connections A1 and A2 to the respective chambers of the double-acting actuator.
Safety positions see chapter “8.7. Safety positions after failure of the electrical or pneumatic auxiliary power”.
important information for perfect control behavior!
This ensures that the control behavior is not extremely negatively affected in the upper stroke range on
account of too little pressure difference.
• keep the applied supply pressure at least 0.5 – 1 bar above the pressure which is required to move the
pneumatic actuator to its end position.
If fluctuations are greater, the control parameters measured with the X.TUNE function are not optimum.
• during operation keep the fluctuations of the supply pressure as low as possible (max. ±10%).
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Type 8791