DC motor polarity reversing switch - wiring diagram
  Bulletin - 3 Levels of Blind, Shade, & Window Control 

Level 1 - RollerTrol™ Simple Remote Controls: We designed our system so that you can start out with our simple wall mount and hand held remotes for our shade/blind motors and skylight/window openers, then upgrade later to a more advanced system. Your investment is preserved as any remotes you purchase will still work, even if you upgrade to level 2 or 3 later. The remote control signals will be 'learned' and used by the higher levels of automation (see our blind & shade automation guide).

Level 2 - BroadLink® RF-IR Blaster Automation Hub: See our affordable blind and shade hub, operated by Android and IOS apps. This RF-IR blaster hub can learn RF radio signals for our blind motors and skylight/window openers and IR learning for TV. Convert old phones and tablets into WiFi home automation controllers!

Level 3 - Home Assistant™: We support the open-source Home Assistant (HASS) software. It runs on any platform, including the Raspberry Pi, see Convert Raspberry Pi into a powerful home automation controller for our BroadLink RF-IR hub, Alexa®, Wink®, Wemo®, SmartThings®, Z-Wave®, etc (over 700 devices and counting!).

Mermet® Custom Shades: For those of you wanting a more complete solution, we are now offering high quality shade and blind fabrics from Mermet®, mounted on standard tubing. Our motors just slide in and lock in place - no fuss no muss! Please check our Custom Blinds and Shades website for info.

Z-WAVE® Blind Automation: This protocol is often used in home automation systems. We have a Z-Wave interface for roller shade and blind motors, and Z-Wave control of our skylight and window opener systems.

We also have interfacing for all home automation systems via relays (see our blind & shade automation guide).

DC motor polarity reversing switch - wiring diagram

FAQ: DC shade motors - can the polarity be reversed with a simple switch?

To reverse our radio equipped blind and shade DC motors, you would use our RollerTrol™ multi-channel RF (Radio Frequency) remote controls (and you can add a ZWAVE home automation hub), so this article would not apply. However, if you are using our non-radio DC shade motors or window/skylight openers, the switches described here can be used to reverse polarity and activate the motor in either direction, providing full reversing capability.

Reversing DC motors requires a specific type of switch, namely a DPDT (double pole, double throw) switch wired in what is known as an 'H Bridge' configuration (pictured at right), so called because the current flow looks like the letter H when you look at a schematic diagram. The 4 upper and lower poles are cross-connected and the motor and power supply are attached as shown in the picture.

We also have a proper DC motor reversing wall switch with open/close/stop buttons. It handles the protected motor reversing break-before-make with a proper H bridge, and it has an internal header you can later connect a home automation system to. (ZWAVE blind and window opener motor control example is here)

You can use slider switches or toggle switches, as shown here. A 'center off' position is also desirable so that you can stop the shade motor at any point. Please note that you should always allow the motor to stop before reversing direction. If you go directly from forward to reverse, it will generate a huge EMF pulse that is very harmful to any DC motor, and you will shorten the life of the motor considerably.DC motor reversing switch - DPDT slider typeDC motor reversing switch - DPDT toggle type

A spring loaded 'center return' type is not the best choice because it would require that you stay at the switch until the blind or shade has reached its full excursion.

This is not necessary as our motors will automatically stop when the travel limit in either direction is reached. This is an especially useful feature when the motors are used for really tall windows such as those found in an atrium or foyer (our motors are capable of unlimited turns between travel limits).

PLEASE NOTE: if you use manual switches like this, rapid switching of the motors from forward to reverse can damage the motors due to powerful counter-EMF forces. Please be sure to allow the motor to stop first, before changing direction. This is generally true of any DC motor.

We sincerely hope you enjoy using these advanced motors; if you have any questions, please feel free to contact us at any time!