AX2500/2850 Motor Controller User’s Manual 137
Wiring Optional Limit Switches
In Figure 84, the encoder and switches are wired to the encoder module using a set of
resistors designed to create a multi-level signal combining both information. Details on the
necessary wiring is provided in the next section.
Since the encoder output signal is “shifted-up” by a few volts, it always st ays above the
Limit Switch comparator’s threshold and no Switch Detection condition is generated. How-
ever, since the limit switches connect to ground when On, the level will dip below the 0.5V
and generate a Switch Detection condition.
Important Warning
When a limit switch is activated, the encoder signal that is shared with the switch is
not longer visible by the encoder module and pulse counting and speed measure-
ment stops.
Wiring Optional Limit Switches
If limit switches are needed by the application, additional circuitry is required in order to
create a multi-level signal that share the enc oder and the switch information. shows the
electrical diagram of the required wiring.
2.5V
0.5V
Signal on Channel A or B
Quadrature Signal
Switch Detect Signal
(Not meaningful)
FIGURE 84. Signals seen by encoder using direct connection and no limit switches
2.5V
0.5V
Signal on Channel A or B
Quadrature Signal
Switch Detect Signal
FIGURE 85. Signals seen by encoder using multi-levels and limit switches