CleaverBrooks ADAC 1000, Operation Manual

Page: 55 / 140

Chapter 3 — Commissioning
Part No. 750-386 3-33
3.18-Secondary Makeup Valve Control
Single Tank - One secondary makeup valve is
allowed.
Dual Tank - One secondary makeup valve is
allowed and can be for either the DA or surge
tank.
Secondary makeup valve control has the same
features as the primary makeup valve with the
exception of valve biasing.
The secondary makeup valve tank level set point is typically set
lower than the primary makeup valve tank level set point to allow
the primary makeup valve to modulate first.
A Help Screen is available.
3.19-Steam PRV Valve Control
Steam PRV Control is only available on the DA tank. This feature is
only available if the Overflow Valve option is NOT selected.
The steam PRV uses a PLC analog output for modulating valve
control to maintain tank pressure. A tank pressure transmitter is
required and must be mounted in steam space.
As tank pressure decreases, the PID controlled analog output will
increase to maintain setpoint. As DA tank pressure increases,
control output will decrease, closing the valve.
Manual decrement/increment buttons are only available in Manual
mode.
An operator level password is required to adjust the tank pressure
setpoint.
Output Trend, Tuning and Tank Pressure Trend, and a Help Screen
are available.
Figure 3-32 PRV Control