Applied Motion BLuAC5-Q - Manual (Page 40)

40
BLuAC5 S/Q Hardware manual
920-0049 Rev. C
12/8/2014
Servo Drive Regeneration
The BLuAC5 servo drive comes with a regeneration clamp circuit and power dump resistor
built in. The circuit is designed to handle any power level that the drive is able to put out but
the internal power dump resistor is not.
The internal power resistor is rated at a continuous 50 watts. This may not be adequate in
cases where the load has a high inertia content and very little frictional content. For these
cases, an external power resistor may be connected to the drive. The minimum size should
be 40 ohms, 50 Watts. A typical value is 50 ohms, 100 Watts. When using an external power
resistor the regeneration parameters must be changed using the QuickTuner™ configuration
tool. See example below.
We offer an external regeneration resistor assembly specifically designed for the BLUAC5.
The part number is RA-100, See page 44 for details.
Now comes the first question. How do I know if an external power resistor is needed?
There are two methods:
1. Calculation - Based on your load and operating conditions you can calculate the
power in watts that will be regenerated. (I know everybody will choose this method)
2. Trial & Error - After operating the system the drive faults and displays a “Regen” er-
ror (small “r”). Keep sizing up the resistor until it can withstand the regeneration.
And the second question is - How do I hook it up? See the diagram below.