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MP240D2 Datasheet(PDF) 19 Page - Opto Electronics Co,. LTD |
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MP240D2 Datasheet(HTML) 19 Page - Opto Electronics Co,. LTD |
19 / 23 page ![]() 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. PAGE 19 Heater Loads Care should be taken in selecting a SSR for driving a heater load if the load is cycled on and off in a continuous manner as might occur in a temperature control application. Constant cycling can cause thermal fatigue in the thyristor chip at the point where the chip bonds to the lead frame. Opto 22 employs a thick copper lead frame for mounting the SCR chips in the power series SSRs to eliminate thermal fatigue failures. In addition, Opto 22 recommends operating any SSR at 75% rated current for cycling heater loads to ensure complete reliability. The following table is a guide to selecting the proper SSR for a given heater load. Single-Phase Reversing Motor Control The circuit diagram below illustrates a typical 1 Ø motor winding inductance and the phase shift capacitor can cause twice-line voltage to appear across the open SSR. A 240-volt SSR should be used for a 120-volt line. During the transition period when one SSR is turned on and the other SSR is going off, both SSRs may be on. In this case, the capacitor may discharge through the two SSRs, causing large currents to flow, which may destroy the SSRs. The addition of RL as shown will protect the SSRs from the short circuit capacitor discharge current. Single-Phase Reversing Motor Control (cont.) The resistors are unnecessary if the control circuit is designed to ensure that one SSR is off before the other SSR is on. Three-Phase Motor Control Three-phase motors may be controlled by solid-state relays as shown. A third SSR as shown is optional, but not necessary. The control windings may be connected in series or parallel. Care should be taken to ensure that the surge current drawn by the motor does not exceed the surge current rating of the SSR. Nominal SSR Curren t Rating Maximum Recommended Heater Current 2-Amp 1½-Amp 4-Amp 2½-Amp 10-Amp 7½-Amp 25-Amp 18-Amp 45-Amp 35-Amp 10 480V 8-Amp 10 480V 8-Amp 240 Volt Three-Phase Motor SSR MODEL MOTOR Z240D10 3/4 HP 240D10 3/4 HP 240A10 3/4 HP 240D25 2 HP 240A25 2 HP 240D45 3 HP |
Similar Part No. - MP240D2 |
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Similar Description - MP240D2 |
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