7 Additional settings
Line count
At a constant speed, incremental encoders provide two periodic signals with a phase shift
of 90° between them (A/B track or Z0 track). The line count corresponds to the number of
full periods per revolution. In most cases, the line count is stated on a data sheet or type
plate of the angle encoder. There are digital incremental encoders that supply square
(digital) track signals, and analogue incremental encoders that supply sine/cosine signals.
In the case of digital incremental encoders, the rising edge and the falling edge of the A
track and B track are evaluated. This is why the resolution is fourfold higher than the line
count itself (quadruple evaluation).
In the case of analogue incremental encoders, the amplitude of the signals is measured in
addition to the zero crossings of the analogue sine signals. These values are included in
the calculation for determining the angle (high resolution). The value Line count must be
entered without the high resolution.
If the encoder has an index pulse, the line count of the angle encoder can be determined
automatically. In this case, enter 0 into the line count field and then start the automatic
identification of the angle encoder parameters (Commutating encoder tab, Auto detect).
Note: After the completion of the parameter identification process, close the window and
reopen it to refresh the Line count parameter.
Gear factor
The default setting of the gear factor is 1:1. It may be necessary to change it, for example,
if the angle encoder provides more than 1 index pulse per revolution.
These settings apply only to a gear factor between angle encoder and motor. If you want
to parameterise an application with a gear unit, specify this gear factor under Display units
to get parameters in the units of the driven side (output).
Error signal
It is possible to evaluate an optional error signal (AS/NAS) of an incremental encoder via
pin 6. This option can be used to activate/deactivate the AS or NAS evaluation and to
determine whether the error signal is high-active or low-active. If the error signal evaluation
is active and the system detects an encoder error, error 08-4 (digital incremental encoder)
or error 08-2 (analogue incremental encoder) will be issued.
"Save & Reset" button:
Numerous optional settings of the angle encoder dialogue window will not become
effective until a reset of the servo drive is performed (resulting in a restart of the encoder
system). If such a setting is changed, the button Save & Reset will be displayed
automatically. It can be used to save the parameter set of the servo drive. Then, a reset
will be performed.
Product manual BL 4000-C Page 138 of 298
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