SETTINGS | Press to | ||
Set Point |
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>Gain | Stage | PRESS TO SELECT | |
Lead |
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GAIN/THROTTLE
OPERATING MODE - NORMAL | Default = 0 |
GAIN
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Value
ADJUST
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ADJUST
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•The Gain adjusts the PID logic in the Harmony to control how much modulation is changed when the system temperature is different from the Set Point.
•A Gain of 0 is a good starting point for all systems.
•If, during normal load conditions, the system temperature tends to fluctuate significantly above and below the Set Point, decrease the Gain by two numbers (for example, from 0 to
•If, during normal load conditions the system temperature tends to remain consistently below the Set Point (or consistently above the Set Point), increase the Gain by two numbers (for example, from 0 to 2). Wait for at least 15 minutes before evaluating how the change has affected the system.
OPERATING MODE - PROCESS | Default = 1.0 |
•The Gain acts as a throttling range around the Set Point.
•When the actual temperature is equal to the Set Point, the lead stage will be at 100% modulation.
•Each throttling range above or below the Set Point controls one stages modulation linearly from 0 to 100%.
•The Process Gain Table below shows the relationship between the Gain and stage modulation.
•The Process Gain Table does not show all the possible modulation values. The table is for example only. The Harmony will control the modulation in one percent increments based on the Set Point and Gain value.
- THROTTLE
PROCESS GAIN/THROTTLING RANGE TABLE
SYSTEM TEMPERATURE | STAGES MODULATION |
3 x Gain Setting Above Set Point | All Stages OFF |
2.5 x Gain Setting Above Set Point | All Stages OFF |
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2 x Gain Above Set Point | Lead Stage at 0% |
1 x Gain Above Set Point | Lead Stage at 0% |
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0.5 x Gain AboveSet Point | Lead Stage at 50% |
At Set Point | Lead Stage at 100% |
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0.5 x Gain Below Set Point | Lead Stage at 100%, 1 Lag at 50% |
1x Gain Below Set Point | Lead and 1 Lag at 100% |
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2 x Gain Below Set Point | Lead and 2 Lag at 100% |
2.5 x Gain Below Set Point | Lead and 2 Lag at 100% |
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3 x Gain Below Set Point | All Stages at 100% |
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15