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MP240D2 Datasheet(PDF) 22 Page - Opto Electronics Co,. LTD

Part # MP240D2
Description  Solid-State Relays
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Manufacturer  E-OEC [Opto Electronics Co,. LTD]
Direct Link  http://www.e-oec.com
Logo E-OEC - Opto Electronics Co,. LTD

MP240D2 Datasheet(HTML) 22 Page - Opto Electronics Co,. LTD

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Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2014 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
requires a small amount of power to operate, derived from
whatever voltage source is placed on the load terminals. A
typical multimeter will not supply sufficient voltage to cause
the relay to change state. Second, AC SSRs contain zero-
voltage turn-on and zero-current turn-off circuits. The SSR will
not be able to turn on unless there is AC voltage connected to
the output terminals. Most test equipment will supply a DC
voltage to the relay, so it will never see the zero-voltage
transition it requires to turn on. To test an SSR, it is best to
operate it at the actual line voltage it will be used at, driving a
load such as a large light bulb.
Q : I have an SSR driving a load. The load turns on
okay, but never seems to turn off, unless I remove
power from the relay entirely. What might be hap-
A: This is normally a problem when using an SSR with a high-
impedance load, such as a neon lamp or a small solenoid.
Loads like these often have relatively large initial currents, but
relatively small “hold in” currents. The result is that the off-state
leakage current through the relay (see previous section) is
insufficient to cause the load to turn on to start with, but
sufficient to keep it on, once started. The solution is to place a
power resistor, sized for 8–10 times the rated maximum
leakage current for the SSR in parallel with the load. Make sure
that this resistor has a high enough power rating for the
application. For example, for a 5 mA leakage current at 120
VAC, a resistor drawing 50 mA would be desirable. Using
Ohm’s Law, the resistor value becomes 2,400 ohms. This
resistor will dissipate 6 watts, so a 7.5 or 10-watt size power
resistor should be used.
Q : I have a new AC SSR driving a solenoid. It turns on
okay once, but will not turn on again. What is going
A: Some solenoids, some types of halogen lights, and some
types of strobe lights incorporate a diode in series with the coil
or filament. This causes the light to behave as a half-wave
rectifier. Opto 22 SSRs have a built-in R-C snubber circuit in
parallel with the output. The capacitor in this circuit charges
up but cannot discharge through the series diode, causing a
voltage to appear across the SSR terminals. Because the SSR
must detect the AC waveform cross through zero volts on the
load terminals, it will not be able to turn on again. The solution
here would be to put a high-value resistor (several tens of
Kohms) across the terminals of the relay, to allow the capacitor
to drain its charge.

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