Hollow Shaft Type Devices
45mm Size Encoder/Potentiometer
EC45A/RK45A
Series
Dimensions
No.
Photo
Style
Unit:mm
PC board mounting hole dimensions
（Viewed
from switch mounting face）
Hollow Shaft
Type Devices
RK45A
Potentiometer Type
20
ø44.5
ø35.6
9
7
3.5
44.4
42.8
36
3
18.5
3
22.7
5
1
2
3
le s
28.2
25
.2
34.8
9
3.5
ho
3
18
ø2
ho
le
Output Wave Incremental Type
）
（
Shaft rotational
Direction
Signal
Sliding Noise Incremental Type
）
（
V
1
＝V
2
＝2.5V
max.
Test circuit
5V DC
Output
OFF
ON
OFF
ON
OFF
ON
OFF
ON
The dotted lines indicate detent positions
3-
ø1
Clockwise
direction
A Terminal 1Ð3
）
（
B Terminal 2Ð3
）
（
Output waveform
t
t
V
1
5V
Terminal 2
R
Terminal 1
R
V
2
Encoder
ON
Terminal 3
OFF
ON
A Terminal 1Ð3
）
（
Counter-clockwise
direction
B Terminal 2Ð3
）
（
21
3.2
Measurement condition：Rotation speed 360˚/s
At R = 10kΩ
Chattering : 3ms max.
Bounce
: 2ms max.
2-
ø3
.2
ho
le
s
2.6
Encoder
Type
t : Masking time to avoid chattering
Potentiometer
Type
Standard Codes Absolute Type
）
（
Number of
positions
Te
Pos
rm
itio
in
n
al
31
Code
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
● ●
● ●
● ●
● ●
● ●
● ●
● ● ● ●
● ● ● ●
● ● ● ●
Gray
4
2
3
5
6
● ●
● ●
● ● ● ●
● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
1. The
●
marks shows the ON position.
2. The
●
marks : Connections between terminals and the common terminal
（terminal
No. =1） ON.
are
Circuit Diagram Potentiometer Type
）
（
1
CW
3
2
461
ALPS [ ALPS ELECTRIC CO.,LTD. ]
