MSC-3 Start Up
P.I.D. Controller
PID controllers (also referred to as three-term controllers) are used to stabilise and/or regulate a process
at a desired operating point. PID controllers function by nding the difference between the required
operating point (the Setpoint Variable or SV) and a measured process quantity (the Process Variable or
PV). The difference is called the “error”. In regulator mode, the PID controller operates to reduce the
error to zero at which point the measured quantity is equal to the required operating point.
Intergral gain
Integrator
Proportional gain
Differential gain
Differentiator
Output clamp
PID Output
(Reference choice)
H04 +Opt clamp
H05 -Opt clamp
Transducer
Process
Analogue
Input
Motor Control
&
Inverter
∑
∑
1
H02 Ti(sec/r)
100
H01 PB(%)
3Ø
IM
d
dt
H03 Td(sec)
dt
∫
Application examples:
• Stair Pressurisation Control: An air pressure transducer and the PID controller of the MSC-3 are
congured to run in essential services override (ESO) mode.
• Cooling Tower Fan Control: A water temperature transducer and the PID controller of the MSC-3
are congured to run typically in remote mode.
• Water Pumping with Automatic Pressure Control: A water pressure transducer and the PID
controller of the MSC-3 are congured to run typically in remote mode.
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