Danfoss VLT HVAC Drive Instruction Manual page 31

6. Press the Hand On button. You will notice that the drive still won't run because it is being
commanded to coast via Digital Input 27. This is shown on the status line at the bottom of
the LCP.
7. Turn ON switch DIN3/27 on the control box, which will apply +24 Vdc to Digital Input 27.
When the switch is closed, the coast command will go away.
8. Press the Hand On button to start the AMA function, and wait until the process has
finished.
9. After the AMA is complete, press the OK key.
10. Verify the parameters shown below are set to the values listed. These are default values.
Parameter
P 5‐10 [8] Start
P 20‐00 [2] Analog Input 54
11. Enter the data shown below to set up a Closed Loop program.
Parameter
P 1‐00 [3] Closed Loop
P 20‐12 [172] in WG
P 20‐13 0.000 in WG
P 20‐14 5.000 in WG
12. Enter the data shown below to scale the feedback terminal to match the feedback
transducer. For this lab, we will be using a potentiometer to simulate a feedback signal.
With the use of the drive's internal +10 Vdc power supply, Analog Input 54 can be fed a
signal that varies from 0‐10 volts.
Parameter
P 6‐20 2.00 V
P 6‐21 10.00 V
P 6‐24 0.000
P 6‐25 5.000
13. Enter the data shown below to set up the Live Zero function.
Parameter
P 6‐00 10s
P 6‐01 [5] Stop and trip
What is the purpose of the Live Zero Function?
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Value
Terminal 18 Digital Input
Feedback 1 Source
Value
Configuration Mode
Reference/Feedback Unit; Inches of Water Gauge
Minimum Reference/Feedb.; Lowest allowed set‐point
Maximum Reference/Feedb.; Highest allowed set‐point
Value
Terminal 54 Low Voltage; Indicates 0" WG
Terminal 54 High Voltage; Indicates 5" WG
Terminal 54 Low Ref./Feedb. Value; Inches of WG
Terminal 54 High Ref./Feedb. Value; Inches of WG
Value
Live Zero Timeout Time
Live Zero Timeout Function
Description
Description
Description
Description
Hint: Use the Info button for an explanation.
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