My Powerflex 525 VFD "Output Frequency" starts to drop out (20, 19, 18, 17, 16, 15, 14, 14, 0, 13, 0, 12, 11, 10, 0, 9, etc.) when the Command Frequency approaches and falls below approx. 14HZ. The "Command Frequency" however does hold steady and does not drop out (20, 19, 18, 17, 16, 15 14, 13, 12, 11, 10, 9, etc.). The Pulse In Scale is set to 64.
I'm using the Pulse Train Input, and as a test started the frequency of the Pulse Train Input at a frequency such that the Command Frequency started at 20HZ, and then slowly adjusted the frequency of the Pulse Train Input down such that the Command Frequency decreased down towards 0Hz.
I did notice that this apparent drop out point is exactly one tenth of the Max Hz value. So for example, with Max Hz set to 140, the dropout starts to occur at approx. 14 (140 x 0.1 = 14). This apparent one tenth drop out point held true for other Max Hz values we tried, including:
Max Hz set at 60 started dropping out at 6
Max Hz set at 100 started dropping out at 10
Max Hz set at 140 started dropping out at 14
Max Hz set at 180 started dropping out at 18
Max Hz set at 190 started dropping out at 19
Max Hz set at 200 started dropping out at 20
Max Hz set at 250 started dropping out at 25
Max Hz set at 400 started dropping out at 40
Topic: Powerflex 525 Output Frequency Drops Out (Read 775 times)