Technical Services_Server-Shenzhen City Electric Co., Ltd. three

Precautions for Miniature Circuit Breakers

Failure phenomenon	Cause of issue	Method of exclusion
After the trip is not on	1, thermal components are not returned to 2, short-circuit fault is not ruled out 3, limit breaking protection	1, wait a few minutes after closing the cooling product; 2, troubleshooting short-circuit; 3, scrapped;
Tripping during normal use	1, start the motor class load 2, subject to abnormal vibration 3, the ambient temperature is higher than 40 ℃ 4, terminal screws loose, resulting in increased temperature.	1, for D curve products 2, row abnormal vibration 3, the use of derating 4, tighten the loose screws

Matters needing Attention in Molded Case Circuit Breaker and Its Solution

Failure phenomenon	Cause of issue	Method of exclusion
Can not be closed	1, the operator forget to buckle, direct closing; 2, circuit breaker installation undervoltage release attachment, the undervoltage coil is not powered. 3, the product operating frequency too much, jump buckle, lock parts over wear and tear, slider	Read the instruction manual. Before closing, the undervoltage coil is energized first. Replace the product.
When the circuit breaker is closed, it is tripped	1, the motor starting current, instantaneous release action; 2, line short-circuit fault, instantaneous release action	Selection of motor protection circuit breaker
In the case of over-current does not move (refused to move)	1, the circuit breaker over-current protection parameter selection margin is too large, so that the release can not move; 2, the circuit breaker trip mechanism is not flexible, there is a phenomenon of stagnation;	Recalculate short circuit, overload parameter Replace product
The circuit-breaker is operated with a normal (rated) current release (malfunction)	1, the ambient temperature is higher than 40 ℃, more than the circuit breaker using the specified temperature limit; 2, the inlet and outlet terminal screws are not tightened, loosening caused by local heating wire, causing the release action; 3, three-phase load current imbalance, single-phase power overload for a long time.	Breaker derating use Check wiring is strong Single-phase current measurement with clamp meter

Dual power switching devices use and maintenance

Dual power supply switching device hereinafter referred to“Device”
1. Precautions before use:
1.1 Always, the inlet end of the two circuit breakers must conform to the designation on the device, while maintaining the same. Such as the use of three-pole circuit breaker when the two power supply (common power supply, standby power) N line can not be wrong, otherwise it will damage the intelligent controller.
1.2 The bottom plate of the device must be reliably earthed to ensure the safety of power supply.
1.3 The intelligent controller of the special plug, a reliable plug into the device's special socket.
1.4 Check the electrical contact parts are reliable, compacted. Fuse is intact.
1.5 Please always check the phase sequence of the power supply before sending the power from the standby power supply. After each phase of the incoming power cable is shaken, ensure that the power supply is not short-circuited.
1.6 After the above inspection and debugging device can be put into use.
2. Troubleshooting: see table

Trouble phenomenon	The cause of the failure	Exclusion method
Device controller has an exception indication	Special plug, socket is not connected well	Pull out the controller plug and socket. Try again from the new reliable connection.
Do not switch the device after the power does not switch	Often, there is a problem with the backup incoming power supply connection	Check the circuit breaker power supply connection is consistent with the device phase sequence marked. Three-phase circuit breaker common power N phase terminal connected to the "NN" on the standby N phase connected to the terminal number is "RN"
On power-up, the control panel has an alarm and displays a phase loss	Phase, or under voltage, the corresponding phase sequence fuse tube blown	1. Check the power supply for lack of phase or undervoltage. 2. If the motor current is too large, blow the fuse tube, replace the appropriate fuse tube and try again.
Short-circuit blow-out device on the A-phase or other fuse tube, or burn out the controller circuit board.	Device body wire damage to the ground short circuit or the corresponding circuit into the line power N phase and A phase reverse	1. Check the parts of the device damage to the shell short-circuit, tape and then try to tape. 2. Check that the incoming power supply phase sequence connection matches the marking on the unit.
Common power supply, external reference signal power supply indicator light.	Outside the pilot signal line wrong	The correct connection: commonly used lights connected“NN”“NA”A group, the standby indicator connected“RN”“RA”A group.
Three-pole device ---- often, standby normal power transmission, the device normal switching, when the cut off the common power supply (standby still has power) device does not switch and without any indication.	Common power supply N phase and standby power N phase reverse	Connect the commonly used N phase to the terminal number“NN”On the standby N phase connected to the terminal number is“RN”So that you can troubleshoot.
Economical switching device Manual operation handle in the switching process is not in place in the closing state of repeated jitter.	Device body micro switch deformation	Then the manual operation of the closing force is excessive, resulting in micro-switch on the device deformation, the specific solutions, please contact us.
Common power supply external signal terminals without AC220V voltage output	Load side is not connected	Will commonly used circuit breaker load A phase and standby circuit breaker load A phase and connected, try again on it.

Precautions and Solutions of Leakage Circuit Breaker

Trouble phenomenon	The cause of the failure	Exclusion method
Circuit breaker is not closed when the power is not on the power is not closed with no load on	Leakage indication reset device is reset, assembled release is out of position	Reset intact, assemble flush or not closed, return to factory inspection
Load power after power-up	Input and output of the terminal is strong, tighten the power cord	Tighten the input and output terminals have found twist is not tight or twist is not in place, or tightened after power is still not, return to the factory inspection.
After the load is not closed when the load on	Load leakage current exists, leakage circuit breaker internal (input, output) have a common zero or repeated ground, the grid voltage may often be too high	Remove the load (power) circuit breaker can be closed, the circuit breaker is normal, troubleshooting the circuit, such as still not on the circuit breaker may be damaged, returned to the factory inspection.

3TW1 series of intelligent circuit breaker precautions

Trouble phenomenon	The cause of the failure	Exclusion method
Can not close	1, undervoltage, release did not pull together; 2, intelligent controller reset button is not reset; 3, the circuit breaker is not stored; 4, drawer-type circuit breaker into the final when the last swing; 5, Shunt release with live; 6, closing electromagnet; 7, circuit-breaker with interlocking mechanism;	Check whether the undervoltage release is energized; measure whether the supply voltage is 85% Ue; Press the reset button above the smart controller; Check the motor is powered, and the voltage must be> 85% Ue, check whether the normal manual energy storage. If the motor-drive mechanism and operating mechanism are faulty, please contact the factory, and then force the circuit breaker in place, can hear two sound "despair, despair & rdquo; sound. "Break" button according to the wrong line or insulation damage caused by shunt charged. Check the electromagnet power supply has electricity, and the voltage must be 85% Ue, close button is normal. Whether the circuit breaker is in two interlocking working state, whether the closing button is locked.
Circuit breaker failure trip	1, over-current trip 2, ground fault protection 3, undervoltage release release	If the display short circuit protection, should be promptly ruled out short-circuit fault; If the overload protection is displayed, it should be loaded or re-modified overload protection value; Press the reset button to reclose the circuit breaker. If unprotected ground fault protection is displayed, first remove the fault or modify the ground protection setting, then press the reset button to close the circuit breaker. Check that the power supply for the trip unit is 85% Ue; If the release is damaged, replace the release.
Breaker disconnected Manual can not be broken, the body stuck	Shunt release does not pull	Check the shunt release power supply voltage is 85% Ue; Check the shunt release is damaged, such as damage to replace the shunt release; Check whether the operating mechanism stuck fault, if any, please contact the factory. If the unit is faulty, contact the factory.
Can not be stored	1, the voltage of the electric mechanism is not normal, the energy storage mechanism is faulty; 2, manual does not store energy.	Check if the motor supply voltage is 85% Ue; Motor winding is disconnected. Failure of the energy storage mechanism should be in contact with the factory. Energy storage institutions have mechanical problems, contact with the factory.
Drawer type circuit breaker handle can not be inserted into the	Drawer seat on both sides of the rail did not push home	Push the rail to the bottom
Drawer-type circuit breaker shake to "disconnect" location can not be drawn out	1, shake the handle is not pulled out 2, not in place, pull out the handle	Turn the breaker completely to the & quot; disconnected & quot; position
Drawer type circuit breaker can not shake to "connection" location	1, a foreign body fall into the drawer seat; 2, circuit breaker specifications and specifications do not match the drawer;	Remove the foreign body, still can not close, please contact the factory; Select the same drawer base according to the circuit breaker specifications.
The intelligent controller displays E	Controller internal fault	Cut off the controller and then send power, such as failure can not be eliminated, please contact the factory.
Intelligent controller screen without display	1, the controller is not connected to an external power supply; 2, the controller internal failure if not connected to the power supply connected to the power supply	If the power is cut off, then the power will be cut off. If there is no display, please contact the factory.