E2 Systems BE 481, Manual

Page: 9 / 28

9
12. Connection of the linear transducer for sensing the position of the feed spindle.
The linear transducer is a potentiometer, which is delivered with a 2 meter (6.56 Ft) long cable
connected to the potentiometer with a PG9 connector, DIN 43650. To facilitate connecting the cable, the
leads are marked with their respective numbers as illustrated in Fig. 10. below.
Max. voltage for the liear transducer is 40V DC. Connection, see Fig. 6 and 10.
Fig. 10.
Important
Connect the transducer as a voltage divider. The amperage across the potentiometer must not exceed
1 µ A. This is no problem if the inner resistance of the analogue IN-port of the measuring device is more
then 0,34 M Ω . Should the external control system require greater amperage, an amplifier must be used
in accordance with Fig. 11 below.
Fig. 11.
When the unit is delivered with a linear transducer, the hydrocheck is fitted with a 2-way valve (24V DC)
for the transition from rapid advance to working feed. This valve is normally closed, and for rapid
advance it shall be supplied with current at the same time as maneuvering valve V1 in Fig. 6. When the
output signal from the position sensor matches the set value for the transition to working feed, the
current to the 2-way valve is broken. If the unit is fitted with a linear transducer, the external control
system must have an analogue input connection to receive the analogue signal from the position sensor.
With the external control system (PLC), the transition from rapid advance to working feed or drilling
depth can then be choosen freely by setting the desired value using the control equipment, for example
for chip removal or multi-wall drilling.