Motor Stall and Large Leakage Detection
Under some heavy hydraulic load conditions, there can occur a stalling of the
induction motor.
This function monitors the pressure for a time. If the pressure is under that
threshold for longer than the time which is set, then either a large leakage or
a motor stall has occurred.
Code
Name
Setting range
Default
Attri.
F4.00
Protection function control word
0...15
Bit0=0: Issues only a warning
Bit0=1: Motor stall detection sets motor
setpoint speed to zero on occurence
Bit3=0: Deactivate oil change detection
Bit3=1: Activate oil change detection
0
Run
F4.61
Motor stall detection: Pressure threshold
0...10,000 bar
20
Run
F4.62
Motor stall detection: Wait time
0...10,000 ms
3,000
Run
Tab. 7-9:
Parameter list of large leakage and motor stall detection
F4.61 Motor stall detection: Pressure threshold / F4.62 Motor stall detection:
Wait time
The parameters describe a band between 0... [F4.61] bar. If the pressure ac‐
tual value persist in this band longer than [F4.62] time. A motor stall or large
leakage / load occurred and a reaction is triggered.
There are two reactions of this function, which is always on:
- F4.00 Bit0 = 0 - > reaction is only a warning
- F4.00 Bit0 = 1 - > reaction is a warning and speed command is set to zero
to stop motor control
- F4.00 Bit3 = 0 - > disable the oil change detection
- F4.00 Bit3 = 1 - > enable the oil change detection
Fig. 7-31:
Motor stall protection function
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
83/143
Frequency-Controlled Pump Drive System Sytronix DRn 5020
Commissioning of Sytronix DRn 5020 System
