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Typ EP 501
Installation
12.3.
Remote operation with external position sensor
In the case of this model, the positioner has no position sensor in the form of a rotary position sensor, but an
external path sensor.
Device.type
Interface
analog (4 ... 20 mA) *
Type EP 501 L
Table 9:
Connection options of path sensor
* If the path sensor is connected to the process controller Type EP 501 C via the analog interface, it can
be operated only as a positioner.
12.3.1. Connection and start-up via a 4 – 20 mA path sensor (for
Type EP 501 L only)
When a 4 – 20 mA path sensor is connected, the process controller the device can be used as a positioner
only, as the process actual value input is used as input for the path sensor.
In principle, any path sensor with a 4 – 20 mA output can be connected which has an adequate resolution of the
path signal.
Good control properties are obtained if the resolution of the path sensor allows at least 1000 measuring steps
over the path to be measured.
Example:
Path sensor with 150 mm measurement range
Of which used measurement range (= stroke) 100 mm
Required minimum resolution of the sensor:
100 mm
1000 Steps
WARNING!
Risk.of.injury.from.improper.start-up.
▶ Start-up may be carried out by authorised technicians only and with the appropriate tools.
Risk.of.injury.from.unintentional.activation.of.the.system.and.an.uncontrolled.restart.
▶ Secure system from unintentional activation.
▶ Following assembly, ensure a controlled restart.
Connect 4 – 20 mA path sensor to the terminals 1 - 4 of the process controller Type EP 501 L.
(see chapter "Table 13: Terminal assignments of the process actual value input", page 44 /
Internal supply of the path sensor:
→ Connection according to input type "4 ... 20 mA - internally supplied"
sensor
Any, high-resolution path
sensor
= 0.1 mm
Setting.in.the.menu..
(ADD.FUNCTION)
POS.SENSOR → ANALOG
For menu description see
"24.2.19"
37
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