14
Bus Voltage Limit
The motors maximum no load speed is limited by its KE. The simple guideline is to divide the
KE into the AC input voltage.
AC Input
-------------- = MAX no load speed
KE Motor
This maximum speed must be derated by .75 at full load.
TAC Gradient Limit
If the drive is being used in the velocity mode, the TAC gradient, as determined by the R-D
converter resolution jumpers, would limit speed.
JP1 JP2 Mode TAC Gradient
IN OUT 14-bit 3.0 ± .3 Vdc Per 1000 rpm
OUT IN 12-bit .75 ± .075 Vdc per 100 rpm
Amplifier saturation occurs at 10 Vdc command. The speed limitations are:
10 / 3 = 3,333 rpm in 14-bit Mode
10 / .75 = 13,333 rpm in 12-bit Mode
14 Bit/12 Bit Jumper
JP1
JP2
NOTE
Do not move jumpers with power ON.
Resolver to Digital Converter Limit
If the drive was being used in the torque mode, bus voltage and the tracking rate of the R-D
Converter would be the speed limitations.
6,000 rpm in 14-Bit Mode
18,000 rpm in 12-Bit Mode
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