Valid for AKM, AKMH, AKD
Kollmorgen motors can be delivered with internal SFD (Smart Feedback Device) Feedback. This feedback system uses a resolver for the position sensor and communicates with the drive digitally. The serial communications to the drive includes motor shaft position, motor temperature measurement, and at power up the motor catalog specifications stored inside the SFD3 in FLASH memory (plug and play).
The Smart Feedback Device (SFD) communicates with the drive over a 4 wire interface. Two wires supply +5V power at <150 mA and the second pair is an RS-485 digital communications link.
Resolution |
224 = 16,777,216 counts per rev = 0.0013 arc min |
|
Accuracy |
Less than +/- 0.75 arc-min electrical + sensor error |
- Size 10 sensor +/- 16 arc-min net
- Size 15 sensor +/- 9 arc-min net
- Size 21 sensor +/- 9 arc-min net
|
Electrical Noise |
Less than 2-17 Rev rms at full bandwidth |
|
Bandwidth |
More than 2000 Hz at -3 dB
More than 1000 Hz at -45 deg phase lag |
|
Max Tracking Rate |
More than 50,000 RPM |
|
Velocity Ripple |
Less than 0.2% p-p electronics only |
- Size 10 sensor < 2.5% p-p net
- Size 15 sensor < 1.5% p-p net
- Size 21 sensor < 1.5% p-p net
|
Velocity Noise |
Less than 4 RPM rms at full bandwidth |
|
Baud Rate |
2.5 MBaud |
Signaling |
- RS-485 differential, 8 bit data with odd parity, compatible with standard UARTs
- Update Period once every 51.2 uSec new position sample
- Error Detection 5 bit CRC in addition to parity check
- EEPROM Memory does a data dump when the unit powers up
|
Supply at Drive |
5.0 V +/- 0.25V (+/-5%) |
Supply at SFD in Motor |
4.25V to 5.25V |
Supply Current |
- Nominal 120 mA
- Worst Case 150 mA
|
Cable Resistance +5V, GND |
Less than 3.3 Ohm net |
Operating Ambient Temperature |
-20 to +120 Deg C |
Humidity |
10% to 90% non-condensing |
Storage Temperature |
-40 to +135 Deg C |