Jerry Hubbell - Explore Scientific VP Engineering
On Tue, Aug 25, 2020 at 02:09 PM, Robert Hoskin wrote:
I just talked with Alex and he has measured the current to be around 700 mA when tracking and slewing. He has the original firmware that had the motor current set to 600 mA for both tracking and slewing.
To be clear, the motor current to each motor with the latest firmware is restricted to 600 mA each tracking, and 900 mA while slewing, BUT the signal to the stepper motors are 50% duty cycle square waves, not straight DC current. The resulting effective current to each motor is 300 mA tracking and 450 mA while slewing with about 100 mA for the circuitry. This means it should be around 700 mA while tracking and 1000 mA when slewing. Again this is with the latest firmware.
I just talked to Wes, he is going to do a measurement on his EXOS 2 PMC-Eight mount, and we will share his results.
Vice President of Engineering
Explore Scientific, LLC.
jrh at explorescientific.com
1010 S. 48th Street
Springdale, AR 72762
Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home
Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Mounts: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras: QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating
Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!