Integral Monitoring System; Introduction - HEIDENHAIN TNC 426 CB Service Manual

2

Integral Monitoring System

2.1

Introduction

The TNC has a comprehensive integral monitoring system for prevention of input or operation
errors, as well as for identification and diagnosis of technical errors on the TNC and the
connected units. The monitoring system is an integral component of the TNC hardware and
software and is active as long as the control is switched on. The presence of a technical fault or
an operation error is made known through a plain-language message.
During operation, the TNC monitors the following positions:
n
Amplitude of encoder signals
n
Edge separation of encoder signals
n
Absolute positions for encoders with distance-coded reference marks
n
Current position (servo lag monitoring)
n
Actual path traversed (movement monitoring)
n
Position deviation at standstill
n
Nominal speed value
n
CRC sum of EPROM, RAM and Flash memory
n
Power supply
n
Buffer battery voltage
n
Operating temperature of logic unit
n
Run time of PLC program
With digital axes, the TNC also monitors:
n
Motor current
n
Motor temperature
n
Temperature of power module
n
DC-link voltage
n
Supply voltage of power module
n 2
I
November 2001
t of power module and motor
2 – 7