Stored energy safety protection device for mining explosion-proof frequency converter
A stored energy safety protection device for a mining explosion-proof frequency converter comprises a relay, a voltage-regulator tube and a resistor R2; wherein the voltage-regulator tube is connected in parallel at two ends of a relay coil, the two ends of the relay coil are connected with output l...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | A stored energy safety protection device for a mining explosion-proof frequency converter comprises a relay, a voltage-regulator tube and a resistor R2; wherein the voltage-regulator tube is connected in parallel at two ends of a relay coil, the two ends of the relay coil are connected with output leads (1, 2); the resistor R2 is connected in series with a normally closed contact of the relay, the other end of the resistor R2 is connected with an output lead (3); and the other end of the normally closed contact of the relay is connected with an output lead (4). The stored energy safety protection device of the utility model has the advantages of no external power, simple wiring, compact size, capacity for playing a role in stored energy safety protection for the frequency converter, and capacity for raising a service life of a capacitor; in addition, by adopting the stored energy safety protection device of the utility model, a dynamic electricity of the frequency converter can reduce capacitor stored energy |
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