
BA Intellidrive User’s Manual
Technical Details
Version 1.4
Aerotech, Inc.
7-7
7.4.
Encoder/Limits/Hall Effects Port P3
The 25-pin “D” style connector contains all of the necessary feedback inputs to complete
a servo loop. This port has inputs for a 3-channel encoder, 3 limit switches, and 3 Hall
effect devices. Each of these inputs provide feedback for the microprocessor controlled
position and velocity loops. The three encoder signals consists of the following: sine
(SIN), cosine (COS), and marker (MKR) as well as their complimentary signals: sine-n
(SIN-N), cosine-n (COS-N), and marker-n (MKR-N).
Two of the three limit inputs are end-of-travel sensing (+ Limit and –Limit) while the
third is a reference limit (Home Limit). The Hall effect switch inputs are recommended
for AC brushless motor commutation but not required. The pinouts for the connector is
shown in Table 7-3.
Table 7-3.
Pinouts for the Encoder/Limits/Hall Effects Port (P3)
Pin
Function
Pin
Function
1
Shield
13
NC
2
Thermistor
14
COS
3
E5
15
COS-N
4
NC
16
Limit +5
5
Hall Effect B
17
SIN
6
MKR-N
18
SIN-N
7
MKR
19
NC
8
NC
20
Limit Com.
9
NC
21
Encoder Com.
10
Hall Effect A
22
Home Limit-N
11
Hall Effect C
23, 25
NC
12
CW Limit-N
24
CCW Limit-N
The maximum encoder frequency input is 2.5 MHz per signal.
IMPORTANT
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