Device 51 - Fixed Inverse Time Overcurrent; Table 6-17 Advanced Motor Protection Menu - Fixed Pickup Inverse Time Overcurrent (Id 7533) - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Motor Protection and RTD Protection Functions

6.18 Device 51 - Fixed Inverse Time Overcurrent

6.18 Device 51 - Fixed Inverse Time Overcurrent
6.18.1 Device 51 - Fixed Inverse Time Overcurrent
Overview
Fixed pickup inverse time overcurrent is used to protect the motor and connected load against
operation under conditions of high current with a trip time that is inversely related to the amount
of current. The fixed pickup inverse time overcurrent function provides a single instantaneous
overcurrent setting that produces a trip or alarm condition when the chosen inverse time
characteristic is met. The function can be programmed to produce a trip or an alarm when any
one, any two, or all three of the phase currents has met its inverse time curve. A variety of IEEE,
ANSI, IEC, and IAC inverse time curves are selectable as well as a user defined curve function.
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. Flux based PLL or encoder provides per unit speed (absolute
value).
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 51 provides parameter status as shown in table
Fixed Pickup Inverse Time Overcurrent.
Table 6-17 Advanced Motor Protection Menu - Fixed Pickup Inverse Time Overcurrent (ID 7533)
Keypad Parameter Text
Tool Parameter Text
Time Dial Multiplier (TDM)
Fixed Inverse Time Overcurrent Pickup Level Time
Dial Multiplier
Pickup Level
Fixed Inverse Time Overcurrent Pickup Level
Def. Time Pickup Delay
Fixed Inverse Time Overcurrent Pickup Delay
Def. Time Dropout Delay
Fixed Inverse Time Overcurrent Dropout Delay
User Programmed Curve
User Programmed Curve
Low Pass Time Const
Fixed Inverse Time Overcurrent Low Pass Time
Const
Minimum Speed
Startup Time
Fixed Inverse Time Overcurrent
82
ID Units Default
7534
7536 %
7517 sec
7519 sec
7538
7559 msec
7560 %
7561 sec
Advanced Motor Protection for Variable Speed Operation
Advanced Motor Protection Menu -
Minimum - Maximum Value
Value
1.0 0.01 - 600
100 0 - 190
1 0 - 180
1 0 - 180
Sub-menu
0 0 - 1000
0 0 - 100
0 0 - 6000
Manual, AA, A5E46373908A