Reading/Writing Position Counter Values Through Fieldbus; Configuration Of Htl Encoder Motor Feedback - ABB ACS880 Firmware Manual

96 Program features
Continue from previous
reboot; bit 6 of 90.35
Note: With a multiturn absolute encoder, bit 6 of
of the drive if the encoder has recovered from the error; bit 4 is not cleared. The
status of the position counter is retained over a control unit reboot, after which
position calculation resumes from the absolute position given by the encoder,
taking into account the initial position specified by 90.58.
WARNING!
If the drive is in stopped state when an encoder error occurs, or if the drive
is not powered, parameters 90.4, 90.5,
because no movement of the load can be detected. When using previous
position values
the position data is unreliable if the load is able to move.

Reading/writing position counter values through fieldbus

The parameters of the position counter function, such as
accessed from an upper-level control system in the following formats:
• 16-bit integer (if 16 bits are sufficient for the application)
• 32-bit integer (can be accessed as two consequent 16-bit words).
For example, to read parameter
of the desired dataset (in group 52) to Other – 90.7, and select the format. If you
select a 32-bit format, the subsequent data word is also automatically reserved.

Configuration of HTL encoder motor feedback

1. Specify the type of the encoder interface module (parameter
and the slot the module is installed into (91.12).
2. Specify the type of the encoder
re-read from the drive after the value is changed.
3. Specify the interface module that the encoder is connected to
1).
4. Set the number of pulses according to encoder nameplate (92.10).
5. If the encoder rotates at a different speed to the motor (ie. is not mounted
directly on the motor shaft), enter the gear ratio in
6. Set parameter
parameter will automatically revert to Done.
7. Check that 91.2
check the status of the module; both LEDs should be glowing green.
8. Start the motor with a reference of eg. 400 rpm.
value, the position values are retained over an error or
is set however to indicate that an error occurred.
(90.60 is set to
90.7
(92.1
91.10 to Refresh to apply the new parameter settings. The
is showing the correct interface module type (FEN-31). Also
90.35
90.7 and
Continue from previous
through fieldbus, set the selection parameter
= HTL). The parameter listing will be
is cleared at the next stop
90.35 are not updated
value), be aware that
90.7 and 90.58, can be
91.11 = FEN-31)
(92.2
90.43 and 90.44.
= Module