ABB COMMANDER 1900 Series User Manual

31
5.10 Introduction to Heat/Cool Control
0
Heat
Output
(%)
Cool
Output
(%)
100
0
10 20 30 40 50 60 70 80 90
10
20
30
40
50
60
70
80
90
100
Max. Cool
Output = 75%*
Max. Heat
Output = 88%*
0
100
Q Heater = 1.5kW
Q Cooler = 0.75kW
Output Off
Hysteresis Band
=15%*
*User definable limits
Transition
Bandwidth
20%
Proportional
Band (Cool)
25.0%
Integral Action
Value (Cool)
Derivative Action
Value
Proportional
Band (Heat)
20.0%
Integral Action
Value (Heat)
Derivative Action
Value
100%
0%
Crossover
Value (33%)
P.I.D. Output (%)
✶
Note.Refer to sections
5.10.2 and 5.10.3
✶
Note. Refer to Sections 5.10.2 and 5.10.3 for Crossover Value and Transition Bandwidth Value examples.
Information.
• P.I.D. Output – is the output value calculated by the controller. The output is divided into two different control
elements one for raising the product temperature (heat output) and one for lowering the product temperature
(cool output).
• Transition Bandwidth – used to transfer smoothly from one set of control terms to the other.
• Crossover Value – defines the changeover point between heat output active and cool output active. The
crossover value is also the centre of the transition and off hysteresis bands.
• Output Off Hysteresis Band – for the majority of applications Outputs 1 and 2 have opposing control actions
i.e. one is direct acting and the other is reverse. In this configuration both outputs are at 0% within the off
hysteresis band. The band setting is used to prevent oscillation of control changes.
• Heat/Cool Outputs – refer to
P.I.D. Output, above.
Fig. 5.18 Heat/Cool Control – Principle of Operation
5 CONTROL OPERATION…

ABB COMMANDER 1900 Series Specifications

General

Brand	ABB
Model	COMMANDER 1900 Series
Category	Voice Recorder
Language	English