ABB ACS860 - Page 286

286 Parameters
Auto falling One of the above modes is selected automatically depending
on the pulse frequency as follows:
5
92.14 Speed estimation
enable
(Visible when a TTL, TTL+ or HTL encoder is selected)
Selects whether calculated or estimated speed is used.
Estimation increases the speed ripple in steady state
operation, but improves the dynamics.
Note: This parameter is not effective with FEN-xx modules
with FPGA version VIEx 2000 or later.
Disable
Disable Last calculated speed used. (The calculation interval is 62.5
microseconds to 4 milliseconds.)
0
Enable Estimated speed (estimated at the time of data request) is
used.
1
92.15 Transient filter (Visible when a TTL, TTL+ or HTL encoder is selected)
Activates transient filtering for the encoder (changes in
direction of rotation are ignored above the selected pulse
frequency).
4880 Hz
4880 Hz Change in direction of rotation allowed below 4880 Hz. 0
2440 Hz Change in direction of rotation allowed below 2440 Hz. 1
1220 Hz Change in direction of rotation allowed below 1220 Hz. 2
Disabled Change in direction of rotation allowed at any pulse frequency. 3
92.21 Encoder cable fault
mode
(Visible when a TTL, TTL+ or HTL encoder is selected)
Selects which encoder cable channels and wires are
monitored for wiring faults.
A, B
A, B A and B. 0
A, B, Z A, B and Z. 1
A+, A-, B+, B- A+, A-, B+ and B-. 2
A+, A-, B+, B-, Z+,
Z-
A+, A-, B+, B-, Z+ and Z-. 3
92.23 Maximum pulse
waiting time
(Visible when parameter 92.01 Encoder 1 type = TTL or HTL)
Determines a pulse waiting time used in speed calculation for
the encoder interface. If no pulse edges are detected within
this time, the measured speed is zeroed by the interface.
Increasing the setting can improve measuring performance
especially at low, near zero speeds.
Notes:
• The parameter is only supported by FEN-xx modules with
FPGA version VIEx 2000 or later. On older modules, the
pulse waiting time is fixed to 4 ms.
• The parameter only affects speed measurement. Position
is updated whenever a new pulse edge is detected. When
the measured speed from the interface is zero, the drive
updates its speed data based on position changes.
4 ms
1…200 ms Maximum pulse waiting time. 1 = 1 ms
No. Name/Value Description Def/FbEq16
Pulse frequency of the
channel(s)
Used mode
< 2442 Hz A&B all
2442…4884 Hz A all
> 4884 Hz A falling