Chapter 2. Troubleshooting
67
CAUTION
Repeatedly cycling
power or resetting the
APEX615n to clear
regeneration faults
may damage the
regeneration resistor.
You can clear the regen fault by cycling power or by resetting the drive. To cycle power, turn
off AC power to the to the Control L1/L2 terminals on the AC power connector, then turn the
power back on; however, if the resistor has not had adequate time to cool, and the conditions
leading to the regen fault persist, you may damage the regen resistor by cycling
power repeatedly. Information about continuous power dissipation in the regen resistor is
lost when power is cycled. To reset the drive, activate the RESET input on the DRIVE
AUXILIARY connector (hold the input to less than 1.2V for at least 20 milliseconds; reset
begins upon release of the low voltage), or issue the DRESET (Drive Reset) command.
Overvoltage Fault
An overvoltage fault indicates that the peak power dissipation capabilities of the regeneration
resistor have been exceeded.
Regeneration causes the voltage on the DC power bus to rise. The regeneration resistor will
turn on when the bus voltage reaches 390VDC. Peak power dissipation occurs at the moment
the resistor turns on. The peak power value is determined by the size of the resistor, and the
voltage across it:
APEX10 Peak Power =
V
2
R
=
390VDC
()
2
150Ω
≈ 1000W (1KW)
As soon as the resistor turns on, regenerated power begins to be dissipated in the resistor, and,
in most applications, bus voltage drops. When the voltage falls below 375VDC, the resistor
turns off. If the motor is still producing regenerated power, the bus voltage will rise again,
the resistor will turn on at 390VDC, and the cycle will repeat over and over until the motor no
longer produces enough power to turn on the regeneration resistor.
However, some applications can regenerate more than 1 KW of peak power. Too much peak
power can overwhelm the regeneration circuit—the bus voltage will continue to rise, even
while the resistor is on. To protect the system from excessive voltages, an overvoltage circuit
monitors the bus voltage, and triggers the overvoltage fault if the voltage exceeds 420VDC.
An overvoltage fault will shut down the drive. The red LED labeled Over Voltage, located on
the APEX6151’s front panel, will be illuminated. You can clear the fault by cycling power, or
by pulling the RESET input low (RESET is located on the DRIVE AUXILIARY connector).
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