Gearbox Stage Selection - Siemens Simodrive 1PH7 Planning Manual

3.3.5

Gearbox stage selection

When changing the gearbox stage, the following information must be carefully
observed:
S Only change over the gearbox stage at standstill; e.g. while changing the tool.
S During selection, the direction of rotation should be changed approximately
5 times per second. The gears normally mesh at the first direction of rotation
change so that selection times of between 300 and 400 ms can be achieved.
The "oscillation" function is provided in the SIMODRIVE 611 analog drive con-
verter for this purpose.
S The gearbox stage should not be changed without oscillation.
S The motor may only start to accelerate 200 ms after the changeover has been
completed.
S The selection must be monitored using a time relay. After 2 s, the selection
must be reversed, if the selection command was not able to be executed.
A time limit of 10 s should be provided for approx. 4 to 5 additional selection
operations.
Initiate a gearbox stage change
Brake the AC motor from the operating speed down to zero speed.
Maintain the controller enable at the transistor PWM converter.
Initiate the "oscillation" function (select terminal)
Selector unit for the gearbox stage change ON
Has the gearbox stage
change been completed with
2 s? (checkback signal from limit switch
S1 or S2 from the gearbox
selector unit)
Cancel the "oscillation" function
Selector unit OFF after 200 ms
Gearbox stage change completed
Fig. 3-6 Function sequence when changing the gearbox stage
 Siemens AG, 2004. All rights reserved
Induction Motors, 1PH7 (APH7S) – 05.04 Edition
No
Repeat
Yes
gearbox
stage
change.
Selector unit back to the initial setting
No
4 to 5
gearbox stage change
attempts executed?
(duration, approx. 10 s)
Yes
Gearbox stage change was not
successful, shutdown the AC motor.
Check the system
Motor Components
3.3 Gearboxes
1PH7/3-127