When using multiple actuators on the same object, you have 2 options for system-type; Synchronized and Tandem. Both system types will result in actuators moving as one unit without individual actuator control. This article will address tandem systems only; meaning there is no computer processor or feedback positioning in this automation system. For more info about, and other options for multi-actuator systems, Click Here.
Tandem motion means wiring actuator motors together (in parallel) so they turn on and off at the same time, as well as move in the same direction. Tandem systems can be more uneven as any unit-to-unit production tolerances may result in different motion speeds, usually within 5-10%.
The simplest possible tandem system is as follows:
- >1 actuators
- Rocker Switch
- 12v Power
Some applications may require more actuators, or higher-current actuators. It's possible that the electrical load from the actuators may be more than the Rocker Switch or RF Remote units can tolerate; in which case, you would need to install relays in the system.
A relay is an automated electrical switch. To learn more about relays, read this tutorial.
In this system below, the high-tolerance relays are used to keep the high-current electrical load away from the RF Remote Unit electronics. This is necessary because the RF unit can tolerate up to 10A at 12v; but some actuators may pull more than 5A each, meaning they will burn out the remote if powered directly through the RF unit. [Parts list below examples]
The SPDT Automotive Relays we carry can tolerate 25A per leg; this is enough to handle up to FIVE 'standard' actuators with a 5A maximum draw, running at the same time.
For Tandem motion of many actuators, you can use this example setup.
- 2+ Linear Actuators (any)
- 2x SPDT Relays & 1x Double Wiring Harness
- Control Scheme (Rocker Switch or Remote Control)
Including speed controllers can allow you to adjust speeds a bit more, giving you the option to really 'tune' the system to be as even as possible. The FA-SC1 will dim the voltage to the motor, giving you a speed-range of 0%-80% of the actuator's max speed.
Additional components:
- 1x Speed Controller per actuator, if needed (12v systems only)
Once Relays are installed in a system, they can be used to 'unify' multiple actuators on the same control scheme, or unify the control schemes to control the same actuator(s). For information on using multiple control inputs, read this tutorial.
