EPS 02 Operating Instructions
RACO Electronic Position Sensor
- Electronic Limit
Switches
- Very Accurate
- Easy to use
- Robust
- Dependable
- High Resolution
- Non Contact
Measurement
- Wide Temp.
Range
Introduction
The RACO electronic positioning system
EPS 02 has been especially designed for end
of stroke limit switch detection in electro-
mechanical linear actuators. The operating
principal is based on a non contact coupling
through a magnetic field. It detects angular
movement of the rotating motor shaft or
actuator screw in relationship to the
stationary sensor on the printed circuit board
and converts this signal into an absolute
linear position signal.
The electronic
position sensor
EPS
02
is
typically
integrated into
the
actuators
accessory
housing
“A”
mounted at the
opposite side of
the motor drive shaft.
If the actuator is
equipped
with
additional
auxiliary
equipment
like
hand wheel, etc..
the
electronic
position
sensor
will be mounted in
the lateral accessory housing “D” located at
the coupling housing connecting the actuator
screw with the drive motor.
In the EPS 02 the two end of stroke limits
can be set via on board push buttons and / or
the TTL level communication interface. In
addition an optional external reference limit
switch can be used. Three on board LED’s
will guide the user through the initial setup
procedure and will function thereafter as
operation control signals.
Function
The EPS 02 consists of two potential
free relay contacts, an input channel for
the motor over-temperature switch, and
the optional external reference limit
switch.
Motor Over-Temperature Switch
To protect the RACO actuator motor
from overheating, for example from
frequent starts and stops or excessive
overloading of the actuator, the opening
of the motor thermal switch will be
monitored. If the motor thermal switch
is wired into terminals X1 pin 4 and pin
5, both limit switch relay contacts will
open up in the event of an over
temperature. The red LED will blink on
and off to indicate that condition.
External Reference Switch
An optional external reference switch
can be used to indicate the retracted
position. The external device has to be a
normally open limit switch or a PNP
proximity switch. The switch will be
connected between terminal X1 pin 3
and pin 4. In the mode external
reference switch, the actuator will
retract until the external switch is made.
With the rising voltage edge at the input
X1 Pin 3 the internal EPS 02 position
reference point will be set to zero each
time. The extended stroke limit position
is defined by the stored stroke length
and the above described zero position.
Make sure that the external reference
switch is positioned in front of the
1
-30
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