Inductive Loads Capacitive Loads and Lamp Loads High inductive peak loads during disconnection may considerably reduce the life span of a
microswitch. The electric circuit can be protected by following the wiring diagram in figure 7 and 8. The ratings of the individual elements (diode, varistor etc.) are determined by the corresponding application. Capacitive and lamp loads may be accompanied by very high discharge rates or start-up current rushes 15 times higher than the rated value. Under such circumstances, current limiters (for instance a protective resistance) should be used (fig. 5 and 6).
Pressure
Introduction
MSR1R2R3LoadC cable Fig. 5: Protection in case of capacitive loads R1 - Protection against start-up current rushes R2, R3 - Protection against high discharge currents Pulsation and Vibrations within the System? How to remedy the problem:
Pulsation and vibrations within the system can affect the function of the pressure switch. There are two different types of pressure switches: one type is sufficiently protected against pulsation and vibrations occurring during operation due to its solid design, the others are designed for precision adjustment which, consequently, makes them more sensitive to such influences. Please refer to the general view for compact pressure switch values regarding vibration resistance. To ensure proper functioning of the pressure switch, please observe the following recommendations: Mechanical Vibrations
MSMSRR Use rubber buffers between units and wall for wall mounted units. Pulsation/Vibration of the Medium Use flexible hose pipes.
If this is technically not possible, place "
attenuators" in front of the pressure switch, for example:helical pipescommercial pulsation attenuators
diaphragm accumulatorsAs air pockets enhance vibrations, please ensure that the hydraulic system is properly vented.••
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Fig. 6: Lamp load provided with resistance in parallel or series connection to switch MSLoadDiode U= Fig. 7: Protection in case of continuous current and inductive load by recovery diode MSCRLoad ~
U Specifications are subject to changes without notice.Index A Fig. 8: Protection in case of alternating current and inductive load by RC-link Barksdale
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