Danfoss VLT FC 102 Programming Manual page 736

Programming Guide | VLT® HVAC Drive FC 102
ALARM 46, Power Card Supply
Cause
The supply on the power card is out of range. Another reason can be a defective heat sink fan. There are 3 supplies generated by the
switch mode supply (SMPS) on the power card:
24 V.
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5 V.
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±18 V.
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When powered with VLT® 24 V DC Supply MCB 107, only 24 V and 5 V supplies are monitored. When powered with 3-phase mains
voltage, all 3 supplies are monitored.
Troubleshooting
Check for a defective power card.
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Check for a defective control card.
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Check for a defective option card.
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If 24 V DC is used, verify proper supply power.
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Check for a defective heat sink fan.
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ALARM 47, 24 V Supply Low
Cause
The 24 V DC is measured on the control card. It occurs when the detected voltage on terminal 12 is lower than 18 V.
Troubleshooting
Check the control card and the load connected.
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ALARM 48, 1.8 V Supply Low
Cause
The 1.8 V DC supply used on the control card is outside of the allowed limits. The supply is measured on the control card.
Troubleshooting
Check for a defective control card.
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If an option is installed, check for overvoltage.
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WARNING 49, SPEED LIMIT
Cause
The warning is shown when the speed is outside of the specified range in parameter 4-12 Motor Speed Low Limit [Hz] and parameter
4-14 Motor Speed High Limit [Hz].
Troubleshooting
Check if the system ran outside of the speed range.
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Check if parameter 4-12 Motor Speed Low Limit [Hz] and parameter 4-14 Motor Speed High Limit [Hz] are set correctly..
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ALARM 50, AMA Calibration
Cause
A calibration error has occurred.
736 | © 2024.10
Troubleshooting
AU430028034214en-001901 / 130R0310