AB Crowell 1326AB-B520E-M2L servo motor

AB Crowell 1326AB-B520E-M2L servo motor

Technical data of product parameters

There are two 1326AB-B520E-M2L methods of wiring field devices to the Compact Contact Input
Module termination block, as shown in Figure 9-2. Each field contact may have a
separate input and return line as shown for channel 1. Alternatively, field contacts
wired to the same Contact Input Module may share a return line as shown for
channels 2 and 3. For either wiring method, do not tie the contact return line to earth
ground or a ground fault condition will occur as well as a degradation of the
common mode surge protection.
Debouncing of a contact input signal is done by an RC filter and digital debouncer 1326AB-B520E-M2L
on the logic side. If a contact changes state for less than 3 msec, the change of state
will always be rejected. If the Contact changes state for more than 7 msec, the
change of state will always be accepted.
Ground fault detection circuitry on the Compact Contact Input Module activates
when the input or return line for any channel finds a low impedance (<5K ohms)
path to earth ground. A single wire with a ground fault will not cause an error in the
point data, but multiple ground faults, if they include input and return lines, could
cause faulty data (that is, channels appearing as if their contacts are closed when 1326AB-B520E-M2L
they are really open).
When a ground fault occurs, the external error LED lights, and the GND Fault bit
in the Status Register (Section 9-7) is set. If the GND Fault Attention Enable bit is
set in the Configuration Register (Section 9-7), a ground fault is seen as a
catastrophic error causing an attention status to be sent back to the Controller. See
Figure 9-2 for ground fault detection circuitry

Product picture display

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