7 Operation and regulation
138
HSD S.p.A. © - h0106k01a.fm120718
Sensor S1+S4: “HSK cone locked in the correct position” signal
Sensor S4 is only present in HSK versions. Sensor S1 and S4 are connected in series. Sensor S1
checks the presence of the HSK tool holder cone in the closed collet, and if positive enables the
reading of sensor S4, which checks it is correctly positioned. When enabled by S1, S4 checks that
the surface stops of the tool holder cone and the HSK coupling system are in correct contact. The
output only changes to “ON” if both conditions are verified as positive.
Ignore the output of S1+S4 during the period from the tool release command to the tool
coupling command.
Sensor S2: “collet open” signal
Signal S2 is used during the tool change cycle: it detects the opening of the collet and whether it is
possible to continue with the next phases of the tool-change cycle.
Sensor S3: spindle shaft rotation speed
Sensor S3 is only present in certain versions. It
provides two “ON” pulses and two “OFF” pulses
with each rotation of the shaft, as shown in the
figure.
Beyond a given rotation speed, output S3 may appear permanently "ON" and then return to
normal when the speed falls below this threshold. This is not a malfunction but depends on
the performance of the CNC.
Ignore signal S3 during the tool-change phase, as it may randomly display either one or
other of the two states (“ON” or “OFF”).
Sensor S5: “piston backward” signal
Sensor S5 is only present in certain versions. It checks the position of the piston. The piston must
be fully backwards (sensor ON) to allow the spindle to rotate.
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