Driving a Solid-State Relay with the L100-MFR2 Series

Sometimes it may be necessary to drive a relay to activate certain external devices such as electromechanical brakes or clutches. Typically electromechanical relays have a 24VDC coil voltage. In the case of the L100-MFR2 Series of Inverters, such voltage is NOT available on any of the inverter terminals. However 10 VDC is supplied by the L100-MFR2 at the [H] terminals, and can be used to drive a small solid-state relay instead. Such relays are typically capable of being driven by 5 - 32 V dc, or some similar range, and can switch a variety of AC or DC voltage levels.

By using a circuit similar to that in the diagram below, you may drive a solid-state relay, using the drive's internal 10 Vdc supply. Terminals [H], [L], [CM2] and [12] of the L100 MFR2 Series Inverters are being utilized.