Absolute Multiturn Encoder - JVL MAC050 User Manual

2.12

Absolute Multiturn Encoder

2.12.1 Introduction
The absolute multiturn encoder is an option with the MAC400, MAC402, MAC800,
MAC1200, MAC1500, MAC3000 and MAC4500 motors.
The option offers the advantage that once the mechanical zero point is defined there will
be no need for any Homing or initialization sequence after power up since the motor al-
ways knows where it is with reference to the original defined zero point regardless that
power have been removed for shorter or longer time.
Please notice that ONLY MAC400, MAC402, MAC800, MAC1200, MAC1500,
MAC3000 and MAC4500 motors with the "F" extension contains this feature (MACxxx-
yy-Fzzz).
The built-in multiturn encoder is using a mechanical technology with the advantage that
no battery is used to hold the position after power off. A battery needs replacement after
a certain operating time or a certain number of charging and recharging cycles.
Basic encoder operation (default)
The encoder position is however locked to a specific mechanical zero position and a fixed
position range. Therefore the encoder position can not be manipulated as flexible as for
the standard encoder type since some upper and lower limits in the working range need
to be respected in order to avoid overflow/wrap around issues during operation. The en-
coder position can maximum operate in the range from -2047 to +2047 mechanical rev-
olutions.
The following pages describe the basic operation and how to set the zero point.
Extended encoder operation (selectable)
For applications that require a larger position range or applications that require that the
motor position is still valid even if the maximum position range is exceeded the extended
encoder operation can be selected.
The main advantage of the extended encoder operation is that the position range is 4
times higher and the overflow/wrap around is handled in a manner that the position data
is still valid after any condition that would normally have caused the position data to be
lost or invalid such as power cycling, reset or save in motor.
The full description of the extended encoder operation can be found in the section
tended encoder operation - detailed description., page 66
JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500
F
Only MACxxx-yy- zzz
Ex-
61