6 – 72 HEIDENHAIN Service Manual iTNC 530 HSCI
Low voltages
and polyfuses
All units connected to the control are powered by it (encoders with long cables may in addition
be provided with voltage amplifiers).
It is thus possible that defective units or even damaged cables have an influence on the low
voltages in the control and generate a variety of error messages.
The current control hardware thus features "polyfuses".
Polyfuses are electronic fuses that become highly resistive if an overload occurs and thus
separate defective peripherals (e.g., handwheel) from the low voltages of the control.
Polyfuses have a self-resetting function ("self-healing effect").
When polyfuses blow, ideally those error messages are displayed that are related to the respective
device . However, error messages may appear that give no clear indication as to which device is
defective.
Cables Defective cables may lead to interruptions and short circuits. Undefined statuses and indirect error
messages may be generated.
Therefore, check in particular, whether the cables show signs of wear or were squeezed, and inspect
the connection points.
Males and
females
Observe the following instructions for connecting or disconnecting any connectors:
D-sub males or females
Connect and disconnect straightly! Otherwise, the spring contacts in the D-sub female connectors
could be widened. This may result in contact problems!
Ribbon connectors or sockets
Connect carefully and straightly with constant pressure in order not to bend any pins.
Signal socket at the motor
Carefully slide the nib of the connector into the notch of the signal socket and screw the connector
straightly. Do not use force! Otherwise the pins could be bent or even pressed into the socket.
Terminals Ensure that the terminals are firmly tightened.
Wires and leads must not be damaged or corroded.
Shielding and
grounding
Defective shieldings and groundings may also result in undefined errors or in a malfunction of the
machine. The reason are compensating currents that are caused by potential differences.
Therefore, check the terminals, shielded cables (the shielding braid must not contact the 0 V conductor
inside the cable), cover plates, grounding bars, contact plates, etc.
For troubleshooting disconnect probably defective devices incl. cable from the control.
--> See ”Error localization by process of exclusion” on page 6 – 63.
If HEIDENHAIN expansion boards are used for the SIMODRIVE system, please check whether the
grounding is implemented as prescribed. --> See ”Exchanging HEIDENHAIN interface boards in
the SIMODRIVE system” on page 29 – 553.
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