Encoder Filter Time Constant; Frequency Switch-Off Limit; Max. Frequency Deviation - DEMAG DIC 002 Series Operating Instructions Manual

Min. number of Division Marks S
S = 500 Hz ∙
min
Tab. 76
To ensure good drive running characteristics, an encoder signal must be evaluated at least every 2 ms (signal
frequency f = 500 Hz). Based on this requirement, the minimum increments S
be calculated for a required minimum speed n
Parameters
No. Name
491 Division Marks Encoder 1
Tab. 77
8.8.5

Encoder Filter time constant

The encoder signal can be filtered to improve the control characteristics with the
Filter time constant encoder 1 815 parameter for low numbers of increments.
Parameters
No. Name
815 Filter time constant encoder 1
Tab. 78
8.9

Frequency Switch-off Limit

The maximum permissible output frequency of the frequency inverter must be set with the
Frequency Switch-off Limit 417 parameter. If this frequency limit is exceeded by Stator Frequency
210, or Actual Frequency 241, the frequency inverter switches off and outputs error message "F1100 Fre‐
quency Switch-off Limit".
For configurations without encoders, Encoder 1 can be activated via the Operation Mode Encoder 1 490
parameter or Encoder 2 can be activated by the Operation Mode Encoder 2 493 parameter for additional
monitoring of the measured actual frequency.
Parameters
No. Name
417 Frequency Switch-off Limit
Tab. 79
8.10

Max. frequency deviation

This function is used to monitor the difference between the Actual Frequency and the integrator output frequency.
If the difference exceeds the value of the Max. frequency deviation 429 parameter, the unit is switched off
and error "1102 Max. frequency deviation" is output.
The function is only activated for Configuration 210 by default.
Parameters
No. Name
429 Max. frequency deviation
Tab. 80
72
min
60 s/min n
min
A = Evaluation (1, 2, 4)
A ∙ n
min
Unit
-
Unit
[ms]
Unit
[Hz]
Unit
[Hz]
= Min. speed of the motor in rpm
.
min
Setting
Min. Max.
Motor Data ➜ Encoder 1
1 8192
Setting
Min. Max.
Motor Data ➜ Encoder 1
Off 128
Setting
Min. Max.
Error/Warning Behaviour
0,00 999,99
Setting
Min. Max.
Error/Warning Behaviour
0,01 15,00
of the incremental encoder can
min
Explanation
Default
1024
Explanation
Default
Off
Explanation
Default
100,00
Explanation
Default
10,00