400 HEIDENHAIN Technical Manual iTNC 530 HSCI
Use of available cable connections:
For cable lengths up to 22 m, the existing cable connections for HEIDENHAIN
handwheels of the HR 4xx and HR 5xx series can be used to retrofit a wireless
handwheel system. The existing handwheel connecting cables must be
checked regarding their length and the possibility of connecting a wireless
handwheel system. Please refer to the cable overview shown above for the
wireless handwheel system.
The relay contacts for the permissive buttons and emergency stop button on
the HRA are four individual, normally open contacts. This information can then
be picked up at the cable adapter.
Behavior of the emergency stop contacts
When the emergency stop button is not pressed, the relays are actuated,
and therefore the relay contacts are closed. If an emergency stop is
triggered, the control voltage of the relays will be switched off and the relay
contacts will open. For the control and the associated safety circuits, the
relay contacts have the same effect as normally closed contacts.
If the batteries of the wireless handwheel are empty or if the wireless
handwheel is out of range, the relay contacts are open.
Behavior of the contacts for the permissive buttons
Depending on the setting in MP7645.3, the permissive buttons are
represented as two normally open contacts, or as one normally open
contact and one normally closed contact. This makes it possible to adapt the
handwheel (permissive buttons) to the requirements of the planned safety
design of the respective machine.
HEIDENHAIN recommends setting the MP7645.3 to 1 to make the
handwheel permissive buttons cross-circuit proof. To ensure compatibility
with previous machine designs, MP7645.3 is set to 0 by default.
• MP7645.3 = 0:
When neither of the two permissive buttons is pressed, both relays are
without control voltage, and therefore the relay contacts are open.
When at least one permissive button is pressed, both relays are
actuated and both relay contacts close.
• MP7645.3 = 1:
When neither of the two permissive buttons is pressed, one of the
relays is without control voltage, and relay contact A is open. When at
least one of the permissive button is pressed, the relay is actuated and
relay contact A closes. When neither of the two permissive buttons is
pressed, control voltage is applied to the other relay and relay contact B
is closed. When at least one of the permissive button is pressed, the
relay is not actuated anymore and relay contact B opens. MP7645.3
must be set to 1 for machines with HEIDENHAIN functional safety.
The interfaces comply with the requirements of EN 60204-1:2006 for
"protective extra-low voltage (PELV)."
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