Re: ES-G11-PMC8 power options

Steve Lang

Awesome Jerry, you da man.

Nothing like talking to the guy that designed it :-)

Cheers (and thanks) -

On 1/05/19 11:27 AM, Jerry Hubbell - Explore Scientific wrote:
Hi Steve,

All PMC-Eight control systems for the G11, EXOS 2, and iEXOS 100 mounts require a nominal 12 Vdc.  The 12 volts is further regulated internally using 10, 5, and 3.3 Vdc LDO regulators rated for 25 Vdc (15 Vdc for the iEXOS 100). The lower limit for the motor operation is the 10 Vdc LDO regulator which requires 12 Vdc at 1 Adc, the dropout is probably less than 2 Vdc at less than 1 Adc, so you may be able to track ( around 0.4 Adc) at 11 Vdc, but the regulator would probably balk if you tried to slew which draws more current. So I would have to say that you shouldn't really operate at less than 12 Vdc. 14 Vdc would probably be optimal.

Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at
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
Wilderness, VA
: 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!

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