Specifications

79
• DOK-DIAX01-MAIN+2AD+1M-ANW1-EN-E1,44 • 07.97
3. Controller Functions
3.15 Gear Change
Various gear reduction stages are used, according to the spindle speed,
to obtain a wide speed range with constant power at the spindle. This
requires automatic gear changes in modern machine tools.
For two reduction stages, the controller handles the automatic changeover;
for more than two stages, the changeover is supported by the controller
by speed oscillation (hunting).
3.15.1 Automatic Gear Change via the Controller
Prerequsites:
• two auxiliary d.c. contactors (see Figure 75)
• two-stage gearbox with gear-change motor
• acknowledgement feedback for gear stages
Gear change is initiated by a change to a parameter record that is
assigned to a stage that is not engaged.
Get-Umschalt-Re
g
el
27
23
24
25
26
28
29
30
31
32
33
34
35
36
37
1
POS 2
E-STOP (RAC only)
RF
RUN
POS 1
MD-RED
OSCILATE
PAR 1
PAR 2
LIMIT 1
LIMIT 2
LIMIT 4
SPEED 1
SPEED 2
EXT POS
1
0
X2 control inputs
control unit
12 SPEED CHANGE 2
X2 signal outputs
initiation of gear
change by changing
parameter records
gear-change motor
actuated by d.c. bus
auxiliary contactor
Table of functions for control inputs and signal outputs
changeover
acknowledged
by gearbox
(
3 AS (KDA/TDA only)
11 SPEED CHANGE 1
Legend:
= signal step
= any control
state
^
^
1 = +24V
0 = 0V
^
^
(
1
1
SPEED 1
0
1
0,1
Control inputs
SPEED 2
1
0
0,1
Acknowledgement from gearbox
gear step 2 is engaged
gear step 1 is engaged
error message GEAR BOX (display)
SPEED 1
CHANGE
0
1
0
Signal outputs
SPEED 2
CHANGE
1
0
0
Gear-change motor actuation
gear step 2 is engaged
gear step 1 is engaged
gear-change motor standing
PAR 1
0
1
0
1
Control inputs
PAR 2
0
0
1
1
P
Q
R
S
Para. record
assignment
example
gear step 1
gear step 2
no assign.
no assign.
Assignment in parameter
G-CHANGE (PQRS 14)
P14 = 1
Q14 = 2
R14 = 0
S14 = 0
Figure 73: Control inputs and signal outputs for gear-change via the controller
Note:
The assignment of gear stages to parameter records P and Q is given as
an example only. Any combination of parameter records P, Q, R and S
is possible.
Function conversion