Troubleshooting guide

Chapter 4 - Backpressure/Discharge Pressure Control ACON.021 25
April 1998 Rev. 1
Chapter 4 - Backpressure/Discharge Pressure
Control ACON.021
4.1 Application Description
ACON.21 is a preset configuration that allows the 2nd Proportional, Integral, Derivative (PID) to
control either backpressure (exhaust) or discharge pressure. This configuration provides:
Speed control.
Backpressure/Discharge pressure control
Raise/Lower speed changing within the governor range
Raise/Lower Backpressure/Discharge pressure
Dual pickup inputs
Loss of speed signal fail-safe
Fail-safe bypass timer (10 seconds)
Overspeed trip and test
Auto-start capability
Trip contact output
Status Indicators for:
Pickup Fail
Overspeed Trip
Trip Output
2nd PID Enabled
TURBINE
PU (1)
PU (2)
DO (8)
S
AO (1)
AI-2A
COMP
OR
PUMP
AI-2B
330-09
Figure 6. ACON.021 Backpressure/Discharge Pressure Control Typical Application