Siemens Sinumerik 840C Diagnostics Manual page 214

1 Alarms
1.5.1 Alarm description
300748 Monitoring cycle of both axes not identical
Scan
When powering up the control.
Effect
The power–up procedure is interrupted, the pulses remain disabled.
Explanation
The monitoring cycle in MD 1300 was not set to an identical value for both axes of a two–axis module.
Remedy
Set MD 1300 to the same value on all drives of the module.
Note
Applies as from SW 5.4.
300749 Conversion factor between motor and load too
Scan
When powering up the control.
Effect
The power–up procedure is interrupted, the pulses remain disabled.
Explanation
The conversion factor from the motor system [increments] to the load system [mm/mdegrees] is greater than 1, or
the factor that converts the load system to the motor system is greater than 65535.
Conditions
The condition for the load to motor system factor is:
The condition for the motor to load system factor is:
mit mm_to_incr +
Equation for
With a rotary motor encoder and a rotary axis:
rotary axis
incr_to_mm(n) +
where n = 0 ... 7 (gear stage) and
incr_to_mm_rot_rot +
Equation for
With a rotary motor encoder and a linear axis:
linear axis
incr_to_mm(n) +
where n = 0 ... 7 (gear stage) and
incr_to_mm_rot_lin +
Remedy
Check the following safety–related MDs, depending on the motor encoder type and axis type,
and correct if necessary.
S
MD 1317
Grid spacing linear scale (for a linear encoder)
S
MD 1318
Encoder marks per revolution (for a rotary encoder)
S
MD 1318
MD 1320
(for a rotary encoder and linear axis)
S
MD 1321
MD 1322
(for the use of a gearbox)
The motor type and axis type are defined in MD 1302.
Note
Applies as from SW 5.4
1–206
1
incr_to_mm
MD1321
MD1322 * incr_to_mm_rot_rot
360000 1
8192 *
MD1318
MD1321
MD1322 * incr_to_mm_rot_lin
1000 1
8192 * MD1318 * MD1320

Siemens AG 2001 All rights reserved 6FC5198–jAB40
mm_to_incr v 65535
incr_to_mm v
1
SINUMERIK 840C / SIMODRIVE 611–D (DA)
08/96 04/96
POWER ON
POWER ON