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Operating instructions for electronic handwheel HKA/HKC
Safety precautions
EUCHNER handwheels HKA/HKC meet the EMC
protection requirements according to EN 61000-6-2
and EN 61000-6-4.
HKA/HKC handwheel must not be used for residen-
tial applications, in business or commercial areas or
in small business.
The operator of the overall higher-level system is
responsible for conformity with the national and
international safety and accident prevention regu-
lations applicable to the special application.
When designing machines and using handwheels,
the national and international safety and accident
prevention regulations specific to the application
must be observed, e.g.:
EN 60204, electrical equipment of machines
EN 12100, safety of machines, general design
principles
EN 13849, safety-related parts of control
systems
Appropriate safety measures must be taken
to prevent a malfunction of the handwheel
which could cause danger to human beings or
damage to operating equipment.
Correct use
The EUCHNER handwheel is a universal pulse
generator for manual shaft positioning.
The handwheel is primarily used for positioning NC-
driven machine tools during set-up.
Handwheels are used as part of an overall higher-
level control system.
Their use, installation and operation are permissible
only in conformity with these Operating Instructions.
Incorrect use
Handwheels on their own must not be used as
safety components for avoiding hazardous states
in a machine installation.
Function
Two square-wave outputs of 100 or 25 pulses per
revolution are available for the user.
A second output phase-shifted by 90° allows the
connected control to detect the direction of move-
ment.
The pulses are evaluated in the control.
The detent mechanism is magnetic and is therefore
totally wear-free.
Assembly
The unit may only be assembled by authorised
personnel.
Do not open the handwheels!
Do not throw or drop the
handwheels!
Do not hit the handwheels!
Do not use tools on the hand-
wheels!
The handwheel is assembled with nuts on 3 threa-
ded M3 bolts.
Fig. 1: Assembly of handwheel HKA/HKC
Electrical connection
Electrical connection may only be performed by
authorised personnel trained in EMC with the
machine switched off and in de-energised
state.
The machine must be safeguarded against
reactivation.
If connected incorrectly, the handwheel
may be damaged.
Observe electrical characteristics and the pin
assignments (see technical data)
Always shield connecting leads.
Apply shielding to handwheel screw terminal pin
.
Ground the shield at the end of the lead at a cen-
tral grounding point, e.g. in the distribution board
or in the control cabinet, over a large surface,
with low resistance and with low inductance.
Do not install connecting leads in the immediate
vicinity of interference sources.
When installing connections, the operator must
ensure compliance with the EMC safety require-
ments.
Authorisation according to
power supply of UL-class 2 only, housing type
UL-type 1.
Service and inspection
EUCHNER handwheels require no maintenance.
Handwheels may only be repaired by the manufac-
turer.
To clean the handwheels, only use solvent-free
cleaning agents and a soft cloth.
Disclaimer of liability
The company does not accept liability regarding
the following cases:
if the unit is not used for its intended purpose
if the safety instructions are not followed
if the units are electrically connected by unautho-
rised personnel
if the units are tampered with
Instructions for counting the handwheel
pulses: Handwheel HKA100 and HKC100
In the home position (detent position), outputs A
and B are both in the LOW state.
a
b
A
B
When it moves clockwise, the home position area is
located closer to the rising edge of A (distance b)
than when it moves counter-clockwise (distance a).
Using a counting method which counts with the
edge of the output and uses the other output for
detecting the direction of rotation can result in sen-
sitive behaviour in one direction.
Suitable counting methods
The following options are recommended for coun-
ting the handwheel pulses:
suitable counter module
phase discriminator
Count with the edge of A
Ascending
Descending
or
Count with the edges of B
Ascending
Descending
Note for A05 and A12:
If the recommended counting method does not
function properly, the signal behavior may be re-
medied by changing the following connection:
Handwheel signal A
Handwheel signal /A
Handwheel signal B
Handwheel signal/B
Unsuitable counting methods
Never use critical pulse edges for counting!
: operation with
On its own, the occurrence of a pulse edge must
not result in movement, e.g. of a machine compo-
nent. Care must be taken to ensure that the coun-
ter does not increment until the position of the hand-
wheel has actually changed.
Counting with the rising/falling edge of A - where B
assists the direction detection (and vice versa) - is
not suitable, because a pulse edge may be
triggered by a slight rotation even though the
handwheel has not yet reached the next detent
position.
A pulse edge is triggered by slight rotation even
though the next detent position has not yet been
reached.
Instructions for counting the handwheel
pulses: Handwheel HKA025 and HKC025
In the home position area, the two output signals
assume the following states in sequence.
Suitable counting methods
Home position area
The following options are recommended for
counting the handwheel pulses:
suitable counter module
phase discriminator
a
A
Uncritical
a
pulse edges
B
falling edge from A and HIGH
level at B
rising edge from A and HIGH
level at B
rising edge from B and HIGH
level at A
falling edge from B and HIGH
level at A
Counter module input /A
Counter module input A
Counter module input /B
Counter module input B
A
B
Home position areas
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