Device 81 - Fixed Pickup High Frequency Rate Of Change - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

6.31

Device 81 - Fixed Pickup High Frequency Rate of Change

Overview
Fixed pickup high frequency rate of change is used to protect the motor and connected load
against fast changing frequencies or high rates of acceleration. The fixed pickup high frequency
rate-of-change function provides a single frequency rate of change setting that produces a trip
or an alarm condition when the rate-of-change of frequency rises above that value. The function
offers an enable that latches once a programmable minimum speed has been reached. The
function can also be enabled once a programmable time period has elapsed since the starting
of the motor. The per-unit speed protection variable may be derived from a flux based Phase
Locked Loop (PLL) or encoder. The default is PLL.
Note
Encoder Loss
Depending upon the value of parameter 1320 (encoder loss response),when a loss of the
encoder occurs, the drive will either default to the phase locked loop to obtain motor speed
information or the drive will stop.
Device 81 provides parameter status as shown in table
Fixed Pickup High Frequency Rate of Change.
Table 6-33 Advanced Motor Protection Menu - Fixed Pickup High Frequency Rate of Change (ID 7684)
Keypad Parameter Text
Tool Parameter Text
Pickup Level
Fixed High Frequency Rate of Change Pickup Level
max % per second change
Pickup Delay
Fixed High Frequency Rate of Change Pickup Delay
Dropout Level
Fixed High Frequency Rate of Change Dropout
Level
Dropout Delay
Fixed High Frequency Rate of Change Dropout De‐
lay
Low Pass Time Constant
Fixed High Frequency Rate of Change Low Pass
Time Constant
Minimum Speed
Fixed Under Frequency Enable Point
Startup Time
Fixed High Frequency Rate of Change Delay from
Startup
Advanced Motor Protection for Variable Speed Operation
Manual, AA, A5E46373908A
Advanced Motor Protection and RTD Protection Functions
6.31 Device 81 - Fixed Pickup High Frequency Rate of Change
ID Units Default
Value
7685 %
7686 sec
7687 %
7688 sec
7689 msec
7690 %
7691 sec
Advanced Motor Protection Menu -
Minimum - Maximum Value
10 0 - 200
1 0 - 6000
2 100 - 200
0.1 0 - 6000
0 0 - 1000
20 0 - 100
5 0 - 6000
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