HEIDENHAIN MANUALplus 620 Manual page 54

Monitoring functions
Description During operation the control monitors the following:
•
Amplitude of the encoder signals
•
Edge separation of the encoder signals
•
Absolute position from encoders with distance-coded reference
marks
•
Current position (following error monitoring)
•
Actual path traversed (movement monitoring)
•
Position deviation at standstill
•
Nominal speed value
•
Checksum of safety-related functions
•
Supply voltage
•
Buffer battery voltage
•
Operating temperature of the MC and CPU
•
Run time of the PLC program
•
Motor current and temperature
•
Temperature of the power module
•
DC-link voltage
With EnDat 2.2 encoders:
•
The CRC checksum of the position value
•
EnDat alarm Error1→ EnDat status alarm register (0xEE)
•
EnDat alarm Error2
•
Edge speed of 5 µs
•
Transmission of the absolute position value on the time grid
In the event of hazardous errors, an EMERGENCY STOP message
is sent to the external electronics via the control-is-ready output,
and the axes are brought to a stop. The correct connection of the
MANUALplus 620 in the machine's EMERGENCY STOP loop is
checked when the control system is switched on. In the event of
an error, the control displays a message in plain language.
Context-sensitive The HELP and ERR keys provide the user with context-sensitive
help help. This means that in the event of an error message, the control
displays information on the cause of the error and proposes
solutions. The machine tool builder can also use this function for
PLC error messages.
Load monitoring Load monitoring (option 151) monitors the load that occurs during
machining processes, in order to detect the wear or breakage of
(option 151)
tools. By performing a reference operation for each machining
step, the nominal load on the drives is determined. The actual
drive load is then continuously compared to the nominal load. Up
to four drives can be monitored per machining step. Two definable
limit values lead to appropriate error reactions should a tool wear
out or break.
Tool wear If the load and/or the load integral exceed the limit value for tool
wear, the MANUALplus 620 marks the current tool as worn out.
With active tool life monitoring the tool will automatically be
replaced by a defined replacement tool the next time it is called.
Tool breakage If the load exceeds the limit value for tool breakage, the
MANUALplus 620 immediately stops machining (cycle stop).
Meaningful error messages are issued if the limit values are
exceeded. Furthermore, the MANUALplus 620 can display the
load values numerically and graphically in a separate window.
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