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APEX615n Installation Guide
Faults Caused by Excessive Regeneration
The APEX615n’s protection circuitry monitors regeneration activity, and can trigger one of
two fault conditions if excess regeneration occurs. Exceeding the regeneration resistor’s
continuous power rating will cause a Regen Fault. Exceeding the resistor’s peak power rating
will cause an Overvoltage Fault. Either of these faults will shut down the APEX615n, to
safeguard the system.
Important specifications for the regeneration circuit are:
Nominal Operating
Voltage:
(based on AC input)
Regen Resistor
Turns ON:
Overvoltage
Fault
Turns ON:
APEX6151 170VDC-340VDC
390VDC 420VDC
APEX6152 340VDC
390VDC 420VDC
APEX6154 340VDC
390VDC 420VDC
Dissipation ratings for the internal regeneration resistor are:
Continuous Power
Dissipation Rating
Peak Power
Dissipation Rating
APEX6151 50 watts
1 KW
APEX6152 80 watts
3 KW
APEX6154 90watts
6 KW
Details regarding the Regen Fault and overvoltage fault are explained below.
Regen Fault
A regen fault indicates that the continuous power dissipation capabilities of the regeneration
resistor have been exceeded.
When the resistor is on and dissipating power, its temperature rises. When the resistor turns
off, its temperature falls. The temperature is determined by the average power dissipation, over
time, and is affected by such things as the length of time the resistor is on, how much power
it dissipates while it is on, and the length of time it is off. During a repetitive move profile,
the resistor’s temperature will increase during deceleration, when regeneration occurs. The
temperature will decrease after regeneration stops—when the motor is accelerating, slewing, or
at rest.
If the average power dissipated in the resistor is less than 40W , the resistor’s temperature will
stay below damaging levels. If the average power dissipated is greater than these values, the
resistor temperature may rise to a level that can permanently damage the resistor. Before
temperatures reach this level, however, the regen fault circuit will shut down the drive. The
purpose of the regen fault is to protect the regeneration resistor from damage due to high
temperatures.
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