Safety Positions - Ebro EP 501 B Guide Rapide

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 "9.3 Safety positions".
Important information for perfect control behavior!
In order to ensure 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 pneu-
matic actuator to its end position.
If fluctuations are greater, the control parameters measured
with the X.TUNE function are not optimal.
• During operation keep the fluctuations of the supply
pressure as low as possible (max. ±10 %).
20
english
Type EP 501 B
Pneumaticconnection
9.3 Safety positions
The safety position following failure of the auxiliary electrical power
depends on the pneumatic connection of the actuator to the working
connections A1 or A2.
9.3.1 Single-acting actuators
Safety positions after failure of the
Actuator system
auxiliary power
→
up
down
→
Control function A
→
up
down
→
Control function B
Tab. 12: Safety positions - single-acting actuators
pneumatic
auxiliary power
down
Connection to
"Fig. 10"
down
up
Connection to
"Fig. 11"
up
Connection to
"Fig. 10"
up
down
Connection to
"Fig. 11"