Burkert Type 8793 - Manual (Page 27)

27
Fluid connection
Type 8792, 8793
Procedure:
→
Apply supply pressure (1.4 – 7 bar) to the supply pressure con-
nection P.
For single-acting actuators (control function A and B):
→
Connect one working connection (A1 or A2, depending on
required safety end position) to the chamber of the single-acting
actuator.
Safety end positions see chapter“13.1.1”.
→
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 end positions see chapter “13.1.2”.
Important information for perfect control behaviour!
This ensures that the control behaviour 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 pneu-
matic 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%).
13.1 Safety end positions
The safety end position following failure of the auxiliary electrical
power depends on the fluidic connection of the actuator to the
working connections A1 or A2.
13.1.1 Single-acting actuators
Actuator system
Safety end positions after failure of the
electrical
auxiliary power
pneumatic
auxiliary power
up
down
down
→
Connection
according to
“Fig. 17”
down
up
→
Connection
according to
“Fig. 18”
Control function A
up
down
up
→
Connection
according to
“Fig. 17”
up
down
→
Connection
according to
“Fig. 18”
Control function B
Tab. 6: Safety end positions - single-acting actuators
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