Hitachi L100-MFR2 Reference Guide

Application Note:
Driving a Solid-State Relay
With the L100-MFR2 Series

Please refer also to the

Inverter Instruction Manual

AN030404-1

Hitachi America, Ltd.

© 2004 Hitachi America, Ltd.

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Application Note: L100-MFR2 Series Inverter –
Driving a Solid-State Relay with the Inverter
Intelligent Outputs

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.

Figure 1 – Typical Setup

Hitachi Inverter

L100-MFR2

Omron Electronics

Model# G3NA-205B DC-24

was used for this test

L

Pos +

Solid-State

24-330V AC

N

Note: Any solid-state relay capable of accepting a 10 VDC input should work.

LOAD

4-32V DC

Relay

Neg -

Jumper

CM2

12

H

L

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Hitachi America, Ltd.

© 2004 Hitachi America, Ltd.