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JPS6428440A - Protection device for ventilation fan - Google Patents

Protection device for ventilation fan

Info

Publication number
JPS6428440A
JPS6428440A JP18626887A JP18626887A JPS6428440A JP S6428440 A JPS6428440 A JP S6428440A JP 18626887 A JP18626887 A JP 18626887A JP 18626887 A JP18626887 A JP 18626887A JP S6428440 A JPS6428440 A JP S6428440A
Authority
JP
Japan
Prior art keywords
circuit
voltage
power supply
coil
speed governor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP18626887A
Other languages
Japanese (ja)
Other versions
JPH0779527B2 (en
Inventor
Masahiko Kawasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Ecology Systems Co Ltd
Original Assignee
Matsushita Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Seiko Co Ltd filed Critical Matsushita Seiko Co Ltd
Priority to JP18626887A priority Critical patent/JPH0779527B2/en
Publication of JPS6428440A publication Critical patent/JPS6428440A/en
Publication of JPH0779527B2 publication Critical patent/JPH0779527B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Ventilation (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

PURPOSE:To operate a shutting-off circuit to enable an electric current flowing into a speed adjusting coil to be shut off by a method wherein a power supply voltage applied between terminals of a speed governor coil is detected by a voltage detection circuit in case of erroneous connection, it is discriminated by a voltage level discriminator circuit and a desired signal is sent to a holding circuit. CONSTITUTION:In case that a correct wiring is arranged, a voltage is induced between terminals of a speed governor coil 4 according to a condition of load in a motor. Since this voltage is lower than the power supply voltage, even if it is detected by a voltage detector circuit 3-1, it is not judged as an erroneous connection by a voltage level discriminator circuit 3-2 and so a shutting-off circuit 3-4 is not operated. Then, in case that a power supply having a waveform (a) is erroneously connected, for example, between the terminals H and L, since a peak value P of waveform detected by the voltage level discriminator circuit 3-2 reaches a set value S, it is judged as an erroneous connection, a pulse signal waveform C is sent to a holding circuit 3-3 to operate a shutting-off circuit 3-4. Then, one end of the speed governor coil 4 is released from the power supply to shut off an electric current and the speed governor coil 4 is protected.
JP18626887A 1987-07-24 1987-07-24 Ventilation fan protector Expired - Lifetime JPH0779527B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18626887A JPH0779527B2 (en) 1987-07-24 1987-07-24 Ventilation fan protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18626887A JPH0779527B2 (en) 1987-07-24 1987-07-24 Ventilation fan protector

Publications (2)

Publication Number Publication Date
JPS6428440A true JPS6428440A (en) 1989-01-31
JPH0779527B2 JPH0779527B2 (en) 1995-08-23

Family

ID=16185316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18626887A Expired - Lifetime JPH0779527B2 (en) 1987-07-24 1987-07-24 Ventilation fan protector

Country Status (1)

Country Link
JP (1) JPH0779527B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111594900A (en) * 2020-06-18 2020-08-28 珠海格力电器股份有限公司 Gear adjustment circuit of household appliances and household appliances

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111594900A (en) * 2020-06-18 2020-08-28 珠海格力电器股份有限公司 Gear adjustment circuit of household appliances and household appliances

Also Published As

Publication number Publication date
JPH0779527B2 (en) 1995-08-23

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