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5.
General
Electronic units of three different sizes are available for the Contrac actuator series. They can be adapt-
ed to the respective actuator type using special parameters. They are the interfaces between process
control systems and actuators/ valves.
The actuators / valves are continuously positioned, independent of the input signal type (analog or dig-
ital).
During positioning the motor torque is continuously changed without steps, until the forces between
control actuator and valve are balanced.
High positioning accuracy combined with excellent control performance and long lifetime are achieved
even for changing load situations and short actuation times.
5.1
Mounting
The electronic unit is designed for rail-mounting in a special rack providing four mounting levels. Either
four units (EAS822 and / or EBS852) or one unit (EBS862) can be installed on each level. It is also pos-
sible to mix the units, as seen in figure 5. Do not transport the rack with the units installed; the total
weight is too high.
Mains supply and location of the fuse units and junction boxes are as shown in figure 20. From there
the cable connections are routed to the electronic units.
5.1.1
EAS822 / EBS852
3
4
5
6
Fig. 1:
1 Mounting eyelet
2 Clamp for strain relief and shield
3 Commissioning and service field (CSF)
4 Terminal strip for signal cable
5 Terminal strip for motor cable
6 Mains connection terminals
1
d0184rxa
2
5
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