Technical data

12-10 Notes Regarding Application MKE UL/CSA
DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P
12.6 Motor feedback encoder
To regulate motor speed or to position the motor, the drive controller
device requires the current position of the motor.
The integrated encoder system (motor feedback) provides the drive
controller with such signals as are needed to perform this function. The
drive controllers are, in turn, equipped to transmit the thereby determined
position value to a superordinate CNC or PLC.
Feedback electronics are equipped with a data memory in which motor
type designation, control loops and motor parameters are stored.
Rexroth Indramat intelligent digital drive controllers can read this data,
thereby guaranteeing
· a quick and easy startup.
· an automatic adjustment between motor and drive controllers,
avoiding any damage to the motor.
The following encoder options can be supplied with MKE motors:
Option
1)
Encoder type Measuring
principle
System
precision
Position
detection type
Position resolution
on motor
G Digital resolver feedback (RSF) Inductive
±8 angle
minutes
Relative
K Digital resolver feedback (RSF
with integrated multiturn
absolute encoder)
Inductive
±8 angle
minutes
Absolute
(over 4096
revolutions)
MKE037, 047
3 x 2
13
= 24,576
MKE098
4 x 2
13
= 32,768
information / rotation
N Digital servo feedback (HSF) Optical
±0.5 angle
minutes
Relative
P Digital servo feedback (HSF
with integrated multiturn
absolute encoder)
Optical
±0.5 angle
minutes
Absolute
(over 4096
revolutions)
MKE098
512 x 2
13
= 4,194,304
information / rotation
1): Options N, P available only for MKE098
Fig. 12-13: MKE motor encoder
For relative indirect position evaluation. Replaces a separate incremental
encoder on the motor.
Note: Characteristics of resolver feedback: After a power failure or
after the first POWER ON, the axis must always be first run to
its reference point before work can begin.
Þ When placing the reference point switches and during the referencing
procedure itself, note that several zero pulses are generated by the
resolver during the course of a mechanical motor revolutionThis is the
result of the operating principle of the motor. Therefore, please note:
· for MKE037 and MKE047: 3 zero pulses per rotation
· for MKE098: 4 zero pulses per rotation
Þ For this reason, avoid transmission ratios that are too large and feed
constants that are too small.
For absolute indirect position detection within a range of 4096 motor
revolutions. Replaces a separate absolute encoder on the motor.
Feedback data storage
Resolver feedback (RSF)
Resolver feedback (RSF) with
integrated multiturn absolute
encoder