P.i.d. Controller - Zener MSC-3 Instruction Manual

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 finding 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.
H06 SV choice
H07 PV choice
Application examples:
• Stair Pressurisation Control: An air pressure transducer and the PID controller of the MSC-3 are
configured 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 configured 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 configured to run typically in remote mode.
58
∑
Intergral gain
1
H02 Ti(sec/r)
Differential gain
H03 Td(sec)
Analogue
Input
Integrator
∫
dt
Differentiator
d
dt
Output clamp
H04 +Opt clamp
H05 -Opt clamp
Motor Control
&
Inverter
Transducer
IM00120 IM00120
Proportional gain
100
∑
H01 PB(%)
PID Output
(Reference choice)
3
Ø
IM
Process