4
Safety requirements
Encoder requirements
Manual – MOVISAFE
®
CS..A Safety Card (Version 2)
34
Error_v_EI7C FS = Actual speed x 1%
Setting the
Filter time speed HTL (8708.4)
parameter makes it possible to filter the cal-
culated speed via a sliding average value filter with the parameterized length.
Acceleration
The acceleration calculation determines the average acceleration in the time range set
via the parameter
Filter time acceleration (8708.2)
. The quantization error that thereby
occurs decreases as the filter time increases. In return, the response time increases in
accordance with the filter time.
Quantization error_a in 1/min s =
(120 s x 1/min) / (PPR_count x (parameterized_filter time)
2
)
In addition to the process-related quantization error, there is an additional actual ac-
celeration error of 0.5%:
Error_a_SinCos = Actual acceleration x 0.5% + Quantization error_a
4.6.3
Counting direction
For the process values to have identical signs also in the inverter, the encoder para-
meter
Counting direction (8708.6)
of the MOVISAFE
®
CS..A safety card must be set
as follows, depending on the inverter parameters
Direction of rotation reversal
(8362.2)
and
Counting direction (8381.6)
:
Direction of rotation re-
versal (8362.2)
setting
Encoder parameter
Counting direction (8708.6)
set-
ting
Inverter parameter
Counting direction (8381.6)
set-
ting
8362.2 = Off
8708.6 = Normal
8381.6 = Normal
8708.6 = Inverted
8381.6 = Inverted
8362.2 = On
8708.6 = Inverted
8381.6 = Normal
8708.6 = Normal
8381.6 = Inverted
4.6.4
Preventing the mechanical limit speed from being exceeded
To prevent the mechanical limit speed to be exceeded, the following switch-off
thresholds are monitored by the MOVISAFE
®
CS..A safety card.
Encoder type
Switch-off
threshold
min
-1
Mechanical limit speed of the encoder
min
-1
EI7C FS
3800
5700
AK0H
6329
9000
AK1H
6445
12 000
E.7S
3809
6000
A.7W
3809
6000
28482271/EN – 03/2019
