Siemens SINUMERIK 828D Function Manual page 1644

Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
DB31, ...
DBX94.0 Motor temperature prewarning
Edge evaluation: no
Signal state 1 The drive signals a "Motor temperature prewarning" to the PLC.
In this case, the motor temperature has exceeded the defined warning threshold:
MD1602 $MD_MOTOR_TEMP_WARN_LIMIT (maximum motor temperature; standard value
120 °C)
②
(
If the motor temperature remains too high, after a defined time:
MD1603 $MD_MOTOR_TEMP_ALARM_TIME
(timer state, motor temperature alarm, standard value 240 s)
the drive is regeneratively braked and then the pulses are inhibited (
Alarm 300614 is output and the interface signal:
DB10 DBX108.6 (drive ready)
is withdrawn.
If the motor temperature rises still further and the shutdown threshold defined in:
MD1607 $MD_MOTOR_TEMP_SHUTDOWN_LIMIT
(motor temperature shutdown limit, default value 155 °C)
is reached, the drive is stopped immediately (refer to
An alarm is also output and IS "Drive Ready" canceled.
However, if the motor temperature drops back down to below the warning threshold, the IS is reset
to 0 (refer to
Special case:
If no temperature sensor signal is measured, this is interpreted as a fault in the motor PTC
thermistor
In this case, the interface signal:
DB31, ... DBX94.0 (motor temperature prewarning)
is also set.
The procedure continues as described above.
Signal state 0 The motor temperature is below the warning threshold.
The actual motor temperature is displayed in the axis/spindle service display in the operating area
"diagnostics".
This display corresponds to the machine data:
MD1702 $MD_MOTOR_TEMPERATURE (motor temperature)
1644
Signal(s) updated: Cyclic
in the diagram).
②
in the diagram).
③
in the diagram).
④
in the diagram).
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions