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Regen Load
Cooling Fan
Copyright 2017 by Haas Automation, Inc. No unauthorized reproduction | Last Published On August 21, 2017
Corrective Action:
Press [POWER OFF]. If the vector drive voltage indicator light is
on, do not touch the electrical components. The high voltage in
the control cabinet can kill you. Wait for the voltage indicator LED
on the vector drive to go off completely.
Disconnect the REGEN load leads from the vector drive at
terminals 1 and 2. Measure the resistance across the leads. The
reading must be as follows:
2-resistor box: between 9.5 and 12.5 ohms.
3-resistor box: between 6.3 and 8.3 ohms ohms. (As shown in
the illustration.)
4-resistor box: between 4.6 and 6.6 ohms.
If the REGEN loads are within specification, there can be a
problem with the vector drive. Measure the resistance across
terminals 1 and 3 on the vector drive. A short is a sign of a faulty
vector drive.
Corrective Action:
An over-temperature alarm is generated when the vector drive's
heat-sink reaches 90°C. The cooling fan must turn ON when the
heat-sink temperature reaches 50°C. The cooling fan must turn
OFF as the heat-sink cools down.
Measure the temperature of the vector drive's heat-sink through
the exhaust vents when this alarm occurs. If the temperature is
above 60°C and the fan is not ON, the vector drive has a faulty
cooling fan. Replace the cooling fan.
6/7
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