Differences

This shows you the differences between two versions of the page.

--- electrical [2026/01/16 04:48] – olt
+++ electrical [2026/05/17 23:37] (current) – [Power] dsheen
@@ Line 9: / Line 9: @@
 The 3-phase mains power circuit for the motor drives goes to a Meanwell "Bidirectional Power Supply AC to DC 2160W 180-264VAC 48Vdc 45A, DC to AC 1800W 48-65Vdc 37.5A 180-264VAC 1725VA" power supply with model number BIC-2200-48 located inside the base of the SCR-584 rotor.
-The bidirectional nature of the power supply allows the motor drives to regenerate power back into the grid when decelerating the dish. In case mains power becomes disconnected or the power supplies fail while the dish is in motion, there is also a Roboteq SR5K100V25R V1.2 active shunt, which clamps excess voltage by dumping power into a bank of power resistors in the event of the bus voltage spiking. See the datasheet {{ :sr5k100v25r_datasheet.pdf | saved here }}.
+The bidirectional nature of the power supply allows the motor drives to regenerate power back into the grid when decelerating the dish, which avoids the need for a resistor bank capable of handling the relatively high average power this would result in under certain scanning/tracking patterns. In case mains power becomes disconnected or the power supplies fail while the dish is in motion, there is also a Roboteq SR5K100V25R V1.2 active shunt, which clamps excess voltage by dumping power into a bank of power resistors in the event of the bus voltage spiking. See the datasheet {{ :sr5k100v25r_datasheet.pdf | saved here }}.
 ==== Motor Control ====
-The motor controllers are custom, see [[https://github.mit.edu/w1xm/RadomeMotorController|this Github]]. They sense position using Celera Motion/Zettlex IncOder contactless absolute magnetic angle encoders, which replace the synchros that were originally present. The IncOders are semi-custom with part number [[https://www.celeramotion.com/zettlex/product/incoder-58mm/|INC-6-58.060-181001-SPI1-AC2-12-S]]. See the datasheet {{ ::incoder_product_guide_mini_rev_4.11.8.pdf | here }}.
+The motor controllers are custom, see [[https://github.mit.edu/w1xm/RadomeMotorController|this Github]]. They sense position using Celera Motion/Zettlex IncOder contactless absolute magnetic angle encoders, which replace the functionality of the [[https://en.wikipedia.org/wiki/Synchro|synchros/selsyns]] that were originally present. The IncOders are semi-custom with part number [[https://www.celeramotion.com/zettlex/product/incoder-58mm/|INC-6-58.060-181001-SPI1-AC2-12-S]]. See the datasheet {{ ::incoder_product_guide_mini_rev_4.11.8.pdf | here }}.
 The Factor 202 industrial Raspberry Pi computer in the radome rack communicates with the motor controllers over CANbus using this [[https://www.inno-maker.com/product/usb-can/|isolated USB CANbus adapter]].