Siemens SINUMERIK 840Di Diagnostic Manual page 726

Overview of Alarms
SIMODRIVE alarms
300720 Axis %1 drive %2 maximum motor speed invalid
Parameters: %1 = NC axis number
%2 = Drive number
Definitions: Because of the high maximum motor speed in the drive MD 1401: $MD_MOTOR_MAX_SPEED and
the speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME sufficiently high speeds
can occur to cause a format overflow. Example: A motor speed of 480,000 rpm can still be processed
without error at a speed controller cycle time of 125 µs.
Reaction: NC not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. Reduce the maximum motor speed MD
1401: $MD_MOTOR_MAX_SPEED (speed for the maximum useful motor speed) or set a smaller
speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME (speed controller cycle).
Program Switch control OFF - ON.
Continuation:
300721 Axis %1 drive %2 zero-load current greater than rated motor current
Parameters: %1 = NC axis number
%2 = Drive number
Definitions: The no-load current of the motor (MD 1136: $MD_MOTOR_NOLOAD_CURRENT) has been set at a
greater value than the rated current of the motor (MD 1103: $MD_MOTOR_NOMINAL_CURRENT).
Reaction: NC not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department.
For standard motors:
Reset the drive (delete the bootfile) and repeat the startup.
For third-party motors:
Check and, if necessary, refer to the motor data sheet to correct machine data MD 1103:
$MD_MOTOR_NOMINAL_CURRENT (rated motor current) and MD 1136:
$MD_MOTOR_NOLOAD_CURRENT (motor no-load current).
Program Switch control OFF - ON.
Continuation:
2-726
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006