Operating instructions

BK MIKRO 7 with scanner TK7A – Scanning in one direction OI: BK MIKRO 7
Page 20 of 32 Rev. 2.01 dated 05.02.2007
4.2.3 Deflection of wand
Rotation angles will be detected by scanner encoder pulses. These pulses are derived from the
rotation of the motor. For scanning, a metal needle (wand) is used which, depending on the
scanning force, can be deflected. As the scanner motor is still turning when the end of this wand
has already come to a stop, differences between the set and actual rotation ranges will result.
For all speeds, wand deflection is compensated to a range of less than 10°. Deflection will
depend, however, on wand length.
4.2.4 Examples for range settings
Fig. 4-3: Range settings using rotary switches for scanning in one direction
Direction of rotation: CCW
No fault range: 90
°
No fault range starts: 180°
No fault range ends: 270°
Direction of rotation: CCW
No fault range: 135
°
No fault range starts: 45°
No fault range ends: 180°
Direction of rotation: CW
No fault range: 90
°
No fault range starts: 180°
No fault range ends: 270°
Toggle switch
0
90
270
180
P1
180
270
90
0
P2
P2
0
90
270
180
P1
180
270
90
0
0
90
270
180
P1
180
270
90
0
P2
P2
0
90
270
180
P1
180
270
90
0
Rotary switches
Direction of rotation: CW
No fault range: 135
°
No fault range starts: 45°
No fault range ends: 180°
0°
good
P1
P2
o
0
P2
good
P1
Rotating range
0
o
P1
P2
o
0
P2
good
P1
R
L
RL
RL
RL
at which:
S1=0
S2=0
good