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  1. bigbang

    Open Loop Tuning using Ziegler Nichols

    Thanks for that. I'm finding it difficult mainly due to the slowness with a period of around 40 minutes , my impatience and lack of tuning experience with these slow loops. I thought I had it nailed the other day with classic 1/4 amplitude dampening after a 6 Deg C setpoint change(94 to 100...
  2. bigbang

    Open Loop Tuning using Ziegler Nichols

    I'm trying to tune a difficult temperature loop with a long response time (around 30 minutes) and thought I'd go back to proven methods rather than using the "suck it and see" approach. Only problem is I'm confusing myself trying to determine the process gain which equals the %Change in...
  3. bigbang

    Open Loop Tuning using Ziegler Nichols

    Thanks I'll do that
  4. bigbang

    Open Loop Tuning using Ziegler Nichols

    I'm trying to tune a difficult temperature loop with a long response time (around 30 minutes) and thought I'd go back to proven methods rather than using the "suck it and see" approach. Only problem is I'm confusing myself trying to determine the process gain which equals the %Change in...
  5. bigbang

    Hazardous Area Classification For Mild Steel Sulphuric Acid Tanks.

    We have a project where we are considering installing high level instrumentation into mild steel acid tanks (approx 6000 Tonne capacity) Does anyone have any guidance or thoughts on the hazardous area classification for mild steel sulphuric acid tanks. In normal operation sulphuric acid will...
  6. bigbang

    VSD - 2 pole at 30 Hz or 4 Pole at 60 Hz

    We recently had to change an electric motor (2 pole ,2900 rpm,5 kw) operating at 30 hz through a variable frequency drive. We replaced it for a 4 pole,1450 rpm and changed the frequency to 60 hz because we had no spare 2 pole motor. My boss and our plant electrician are currently arguing over...
  7. bigbang

    Variable frequency Drives and pumps

    We recently had to change an electric motor (2 pole ,2900 rpm,5 kw) operating at 30 hz through a variable frequency drive. We replaced it for a 4 pole,1450 rpm and changed the frequency to 60 hz because we had no spare 2 pole motor. My boss and our plant electrician are currently arguing over...
  8. bigbang

    Corrupt Manager

    Several years ago I worked for a manager who I believed was taking financial "kickbacks" from contractors. I had no hard evidence to prove this but was told by one of these contractors this was occurring. He told me if I ever brought this up they would deny all knowledge. This...

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