Installation manual

www.baldormotion.com
4-18 Input / Output MN1933
4.5.1.1 Encoder input frequency
The maximum encoder input frequency is approximately 10 million quadrature counts per
second. This is equivalent to a frequency for the A and B signals of 2.5 MHz. However, the
maximum achievable frequency is affected by the length of the encoder cables, as shown in
Table 3:
F
r
e
q
u
e
n
c
y
Maximum cable length
F
r
equenc
y
meters feet
1.3 MHz 2 6.56
500 kHz 10 32.8
250 kHz 20 65.6
100 kHz 50 164.0
50 kHz 100 328.1
20 kHz 300 984.2
10 kHz 700 2296.6
7kHz 1000 3280.8
Table 3 - Effect of cable length on maximum encoder frequency
The maximum recommended cable length is 30.5 m (100 ft).
CHA-
CHA+
Breakout module
5
9
Shield4
Connect overall shield to
connector backshells /
shiel d connections.
Twisted pair
MicroFlex
FlexDrive
II
Flex+Drive
II
MintDrive
II
encoder output
7 DGND
Connect internal
shield to DGND.
Do not connect
other end.
CHA-
CHA+ 1
6
‘X7’
CHB-
CHB+
8
3
Twisted pair
CHB-
CHB+ 2
7
CHZ-
CHZ+
2
6
Twisted pair
CHZ-
CHZ+ 3
8
‘X12’
100
way
cable
NextMove PCI-2
Figure 11 - Encoder input C - typical connection from a drive amplifier
(e.g. Baldor MicroFlex, FlexDrive
II
, Flex+Drive
II
or MintDrive
II
)