Calibrator Warning Messages; Pid Control Parameters - Presys T-1200PIR Technical Manual

PRESYS
 Instruments

5.0 - Calibrator Warning Messages

Warning
RAM ERROR
READ MANUAL
EEPROM ERROR
READ MANUAL
LOW BATTERY
UNDER / OVER
????.??ºC

6.0 - PID Control Parameters

6.0 - PID Control Parameters 6.0 - PID Control Parameters
The T-1200PIR calibrators have a PID control algorithm to calculate the The T-1200PIR calibrators have a PID control algorithm to calculate the The T-1200PIR calibrators have a PID control algorithm to calculate the
temperature control output. temperature control output. temperature control output.
The black body cavity stability and response time features are related to the PID The black body cavity stability and response time features are related to the PID The black body cavity stability and response time features are related to the PID
parameters, explained below: parameters, explained below: parameters, explained below:
The K parameter (proportional gain) amplifies the error signal between the set parameter (proportional gain) amplifies the error signal between the set parameter (proportional gain) amplifies the error signal between the set
point and the cavity temperature to establish the output signal. When this parameter is and the cavity temperature to establish the output signal. When this parameter is and the cavity temperature to establish the output signal. When this parameter is
very high, the output reaction is very quick; however this can take the system into very high, the output reaction is very quick; however this can take the system into very high, the output reaction is very quick; however this can take the system into
oscillation. Decreasing this parameter, the cavity would not be able to react quickly oscillation. Decreasing this parameter, the cavity would not be able to react quickly oscillation. Decreasing this parameter, the cavity would not be able to react quickly
enough to external variations, giving the impression of a sudden out of control. enough to external variations, giving the impression of a sudden out of control. enough to external variations, giving the impression of a sudden out of control.
The I I parameter (integral gain) is responsible for the integral action and it is the The The I parameter (integral gain) is responsible for the integral action and it is the parameter (integral gain) is responsible for the integral action and it is the
most important part in the set point control. While an error persists between the set most important part in the set point control. While an error persists between the set most important part in the set point control. While an error persists between the set
point point and the cavity temperature, the integral action will actuate on the output signal point and the cavity temperature, the integral action will actuate on the output signal and the cavity temperature, the integral action will actuate on the output signal
until the error is brought to zero. until the error is brought to zero. until the error is brought to zero.
The D D parameter (derivative gain) is responsible for the derivative action that The The D parameter (derivative gain) is responsible for the derivative action that parameter (derivative gain) is responsible for the derivative action that
provides a quick response at the control output resulting from any rapt variation in the provides a quick response at the control output resulting from any rapt variation in the provides a quick response at the control output resulting from any rapt variation in the
cavity temperature. It is used to eliminate oscillations. However, it can cause cavity temperature. It is used to eliminate oscillations. However, it can cause cavity temperature. It is used to eliminate oscillations. However, it can cause
oscillations in the presence of much noise. oscillations in the presence of much noise. oscillations in the presence of much noise.
All temperature calibrators are tuned in factory and the parameters are close to All temperature calibrators are tuned in factory and the parameters are close to All temperature calibrators are tuned in factory and the parameters are close to
the optimum ones. In case one wants to improve a specific feature of the calibrator the optimum ones. In case one wants to improve a specific feature of the calibrator the optimum ones. In case one wants to improve a specific feature of the calibrator
(stabilization time or response time, for instance), make sure the alteration is made (stabilization time or response time, for instance), make sure the alteration is made (stabilization time or response time, for instance), make sure the alteration is made
reasonably. reasonably. reasonably.
Meaning
Problem in RAM
memory
Problem in EEPROM
memory
Level of battery voltage is Level of battery voltage is Level of battery voltage is
low
Input signal out of
specifications or scaling specifications or scaling specifications or scaling
range
Input sensor is open Input sensor is open Input sensor is open
Procedure Procedure Procedure
Turn the calibrator off and urn the calibrator off and urn the calibrator off and
on. If the error persists, on. If the error persists, on. If the error persists,
send the instrument to the send the instrument to the send the instrument to the
factory factory factory
Same as the previous item Same as the previous item Same as the previous item
Check the T- - 1200P Check the T Check the T-1200PIR 1200PIR IR
calibrator power supply calibrator power supply calibrator power supply
See item 1.1.1 on Input See item 1.1.1 on Input See item 1.1.1 on Input
Specifications Specifications Specifications
Check input connections Check input connections Check input connections
and sensor and sensor and sensor
T-1200PIR
Page 17