Chapter 6 – Parameters
ACH 500 Programming Manual 6-35
• This condition has lasted longer than the period set in Parameter 30.1.10
(Stall Time/Freq).
Figure 6-14 shows stall protection.
Figure 6-14 Stall Protection
9 STALL CURRENT
This parameter sets the current level that must be exceeded for the stall
protection to activate. Setting in actual amps, step is 1% of I
N
, 0 – 1.5 x I
N
.
10 STALL TIME/FREQ
10s/15Hz
20s/25Hz
30s/35Hz
This parameter sets the time and frequency values for the stall function.
11 UNDERLOAD FUNC
Removal of motor load may indicate a process malfunction. The protection is
activated if:
• The motor torque drops below the load curve selected in Parameter
30.1.13 (Underload Curve),
• This condition has lasted longer than the time set in Parameter 30.1.12
(Underload Time), and
• Output frequency is more than 5 Hz.
Select NO/WARNING/FAULT according to the activity you prefer.
12 UNDERLOAD TIME
0 – 600s, 1s step.
Time limit for underload logic.
Stall Region
Stall Current
ƒStall Frequency
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