Lust CDA32.006 - 3.7.6 Encoder

3-16
CDA3000 Operation Manual
3 Installation
3.7.6 Encoder
Specification of encoder connections:
A HTL encoder with 24 V supply can be connected to terminals X2/11
and 12. Permissible pulse counts are in the range from
32, 64, 128, 256,
512, 1024 ...to 16384 pulses per rev
(2
n
where
n = 5 to 14
).
Figure 3.10 Block diagram, HTL output circuit
Maximum number of lines of
encoder
Example of n
max
= 6000 rpm:
Calculated: pulses per rev.
Selected: An encoder with 1024 pulses per rev.
Reasoning: 1500 pulses per rev. is not programmable - the nearest
possible value is 1024 pulses per rev. (binary 2
10
)
Minimum motor speed Formula for calculating the minimum motor speed depending on the
encoder lines per revolution so that one pulse of the encoder can be
evaluated each scan cycle of the inverter module.
Des. Specification
Digital
inputs
ISD02
ISD03
•f
limit
= 150 kHz
• PLC-compatible (L = < 5 V, H = > 18 V)
• Current consumption (encoder) max. 80 mA
Connecting
cable
- • Screened twisted-pair cable with approx. 60 nF/km
• Cable length max. 30 m
+
A
NPN
PNP
-
LR
max
=
Maximum number of lines of encoder in
pulses per rev.
n
max
=
Maximum speed of motor in rpm
LR
max
910
6
⋅
n
max
---------------=
LR
max
910
6
⋅
6000
--------------- 1500==
LR =
Number of lines of encoder in pulses per rev.
n
min
=
Minimum speed of motor in rpm
n
min
3000
LR
-----------
1
min
---------
⋅=