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Summary of Contents for TERASAKI AME Series
- Page 1 Air Circuit Breakers AME Series Instruction Manual Applicable Breaker Types: AME3B AME4B AME6B AME8B AME10B Please retain this manual for future reference. KRB-5200h...
- Page 2 KRB-5200h...
- Page 3 INTRODUCTION Thank you for purchasing the Terasaki AME Series Air Circuit Breaker for generator protection (hereinafter referred to as the ACB). Please read this manual thoroughly to ensure correct use of the ACB. To Customers: This manual is to be delivered to the user after completion of the installation work.
- Page 4 Installation Precautions See pages 4 to 8. Warning Be sure to open or trip the live ACB before mounting or dismounting it. Otherwise, a fire or personal injury may result. Never touch live parts or terminals when mounting or dismounting the live ACB. Otherwise, electric shock may result.
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Page 5: Table Of Contents
Table of Contents 1. OUTER VIEW ............................1 2. RECEIVING AND HANDLING ........................2 2.1 Unpacking Precautions ........................2 2.2 Transportation Precautions ......................2 2.3 Storage Precautions ........................2 3. INSTALLATION ............................4 3.1 Installing Rear-Connected ACB ...................... 4 3.2 Installing Plug-in ACB ........................6 3.3 Connection and Specifications of Accessories ................ -
Page 7: Outer View
1. OUTER VIEW Breaker nameplate Main circuit terminals Handle Auxiliary circuit terminals (for SHT or UVT) Auxiliary circuit terminals (for auxiliary/alarm switch) OCR test terminals Seal for OCR cover mounting screw Transparent OCR cover OCR nameplate Trip button Direct-operated AME6B (rear-connected type) Accessory (motor Main circuit terminals... -
Page 8: Receiving And Handling
2. RECEIVING AND HANDLING 2.1 Unpacking Precautions The ACB from Terasaki is completely assembled, inspected and tested both electrically and mechanically at the factory, then shipped in fully guaranteed conditions in construction and operation. Upon receipt of your ACB, check the following. If you have any question or any problem, contact your local agent or our branch office. - Page 9 Place the ACB on a flat, level surface in its normal standing position. (Do not turn the ACB sideways.) Do not place the ACB directly on the floor. Do not expose the ACB to direct sunlight for a long time. KRB-5200h...
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Page 10: Installation
3. INSTALLATION 3.1 Installing Rear-Connected ACB For details of ACB mounting dimensions, see the catalogue. Caution (1) Installation work must be performed by competent persons. (2) Prior to commencing any work on the ACB, stop the generator and open a disconnector or the like to isolate all sources of power/voltage from both the primary and auxiliary circuits. - Page 11 Other Precautions Install the ACB main unit vertically. For AME3B, AME4B and AME6B, the stud bar direction can be changed from horizontal to vertical in the field. When changing the stud bar direction, observe the following safety notice. This work must be done by competent persons.
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Page 12: Installing Plug-In Acb
3.2 Installing Plug-in ACB For details of ACB mounting dimensions, see the catalogue. Warning (1) Be sure to open or trip the live ACB before mounting or dismounting it. Otherwise, a fire or personal injury may result. (2) Never touch live parts or terminals when mounting or dismounting the live ACB. Otherwise, electric shock may result. - Page 13 ACB mounting screw Mounting angle (not supplied) Plug-in mounting base Connecting conductor (for XMD4) Terminal screw Mounting base Auxiliary circuit fixing screw terminal block M3.5 screw Control wire Terminal screw Fig. 3 Mounting and Connection Example (AME4B) Other Precautions Install the plug-in mounting base vertically with the label mark upward.
- Page 14 Check to be sure that a mounting angle has sufficient strength to support the ACB mass. Vibration, in particular, must be taken into account. Vibration of the switchboard could result in false tripping of the ACB. Be sure to avoid resonance. Do not place the ACB in such an area that is subject to direct sunlight.
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Page 15: Connection And Specifications Of Accessories
3.3 Connection and Specifications of Accessories 3.3.1 Undervoltage Trip Device (UVT) UVT CONTROL DEVICE The UVT is optional. AC 450 V,50 / 60Hz Check if the rated voltage shown on the accessory Electrical Trip Terminal Source nameplate (attached on the ACB left side) is suitable for the working voltage. -
Page 16: Shunt Trip Device (Sht)
3.3.2 Shunt Trip Device (SHT) The SHT is optional. Check if the rated voltage shown on the accessory nameplate (attached on the ACB left side) is suitable for the working voltage. SHUNT TRIP V 50/60Hz 200-480 V DC The SHT is used to trip the ACB electrically from a remote position. ... -
Page 17: Auxiliary Switch (Ax) And Alarm Switch (Al)
3.3.3 Auxiliary Switch (AX) and Alarm Switch (AL) The auxiliary switch is used to indicate the ON or OFF state of the ACB. The alarm switch (optional) is used to indicate the TRIPPED state of the ACB. Switch Operation State of ACB Contact arrangement TRIPPED... -
Page 18: Motor Operator
3.3.4 Motor Operator The motor operator (optional) permits the ACB to be electrically closed, opened (reset) from a remote position. Connection Remove the terminal cover (transparent) and connect the operating switch control wire and the power supply wire to the control circuit terminals as follows: Motor operator OFF/RESET ON switch... -
Page 19: Operation
4. OPERATION 4.1 Direct-Manual Operation Warning Never touch live terminal parts Otherwise, electric shock may result. TRIPPED (RESET) ON position TRIPPED position OFF position RESET position Main contacts Main contacts Main contacts Main contacts “Closed” “Open” “Open” “Open” Fig. 8 Handle Positions and Status Indication ON operation Caution... - Page 20 Reset operation To close the tripped ACB, the reset operation is necessary. To reset the ACB, move the operating handle to the RESET position beyond the OFF position. When the UVT coil is not excited, the ACB can be reset but not closed. Extension handle The use of the extension handle reduces the operating force as shown in the following table.
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Page 21: External-Manual Operation
4.2 External-Manual Operation This section describes the AFB External Operating Handle which is to be installed on the switchboard. Warning Open the ACB (set the external operating handle to the OFF position) to stop the generator operation before opening the switchboard door. Otherwise, touching a live part will cause electric shock. - Page 22 Reset operation To close the tripped ACB, the reset operation is necessary. To reset the ACB, turn the external operating handle counterclockwise to the RESET position beyond the OFF [O] position. When the UVT coil is not excited, the ACB can be reset but not closed. Caution Before closing the switchboard door: Set the external operating handle to the OFF [O] or TRIP position.
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Page 23: Motorized Operation
4.3 Motorized Operation This section describes the XMD Motor Operator which is to be installed on the ACB. For mounting and dismounting procedures of the motor operator see the XMD Series Motor Operator - Operating Instructions. 4.3.1 Motorized Operator Caution ... - Page 24 ON operation Caution If the ACB trips open automatically, remove the cause before closing the ACB. Otherwise, a fire could result. Closing an external ON switch (not supplied) will close the ACB within 0.1 second. Caution : When the ACB is equipped with the undervoltage trip device (UVT), the UVT coil must be excited to permit the ON operation.
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Page 25: Manual Operation
4.3.2 Manual Operation The manual operating handle is intended to be used for maintenance or inspection, or if operating power fails. ON or OFF/Reset operation Warning Never touch live terminal parts Otherwise, electric shock may result. Pulling down the manual operating handle will open (OFF) and close (ON) the ACB alternately. Perform the same operation to reset the ACB. -
Page 26: Overcurrent Trip Device
5. OVERCURRENT TRIP DEVICE The overcurrent trip device (OCR) is composed of primary current transformers (CT) connected to each pole of the ACB, an electronic OCR controller, and an OCR tripping coil (MHT). When the ACB is equipped with the UVT, it does not contain the OCR tripping coil (MHT). -
Page 27: Ocr Field Tests
How to change the OCR settings: When the ACB is equipped with the XMD4M motor operator, remove the operator before changing the settings. For procedures for removing and mounting the operator, see [3] Before and After Checking the Trip Settings, XMD Series Motor Operator - Operating Instructions. ①... - Page 28 ③ Close the ACB. ④ Check for the long time-delay trip pick-up current (I To do this, increase the test current gradually and measure the current at which the I pick-up LED begins to flicker. It is acceptable when the measured current falls within the range of 92.5 to 107.5% of I 92.5 to 117.5% of I when I is 50% or less of I...
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Page 29: Tests With Current Applied To The Ocr Test Terminal
5.2.2 Tests with Current Applied to the OCR Test Terminal The secondary current calculated with the primary current and ACB main circuit CT ratio (I ) is applied to the OCR test terminal on the left side of the ACB to check for the tripping characteristics. Caution ... - Page 30 Calculation Example: CT RATED CUR. 250 / 0.05 A RATED CUR. 231 A LONG TIME 1.15 X In 20 SEC at 1.2 X I Assuming the conditions shown above, the test current is given by 0 05 ...
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Page 31: Tests Using Ocr Checker (Type Ans1)
5.2.3 Tests Using OCR Checker (type ANS1) The ANS1 type OCR checker is used to check for instantaneous trip function. Two or more ACB’s cannot be tested using the OCR checker at the same time. Caution OCR field tests must be performed by competent persons. ... -
Page 32: Operation Characteristic Curves
5.3 Operation Characteristic Curves KRB-5200h -26-... -
Page 33: Precautions On Temperature-Rise Test
6. PRECAUTIONS ON TEMPERATURE-RISE TEST When performing a temperature-rise test using a single-phase power supply, set the short time-delay trip pick-up current (I ) to In x 2.5 or more. A temperature-rise test with I set to In x 2 and three poles connected in serial may cause the ACB to trip open. -
Page 34: Maintenance And Inspection
8. MAINTENANCE AND INSPECTION Caution (1) Maintenance and inspection of the ACB must be performed by competent persons. (2) Prior to commencing maintenance and/or inspection work on the ACB, stop the generator and open a disconnector or the like to isolate all sources of power/voltage from both the primary and auxiliary circuits. -
Page 35: Inspection Procedures
Replace ACB or, if identified, its Smooth Open/close handle or trip ON/OFF/Reset defective parts. operation button operation (Consult Terasaki for advice) Electrical operation with UVT or SHT No crack or Crack, damage, or discoloration on the damage Replace ACB. Visual check ... - Page 36 Table 4: ACB Internal Resistance (per pole) ACB type Rated current Internal resistance (mΩ) Limit resistance (mΩ) (In) A Rear-connected Plug-in Rear-connected Plug-in 16 ＜ In ≦ 31.5 AME3B 0.25 31.5 ＜ In ≦ 250 0.15 250 ＜ In ≦ 400 AME4B 0.15 315 ＜...
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Page 37: Troubleshooting
Opening operation is Replace ACB. Main contact is welded. impossible. 1. OCR is defective. Replace ACB. Consult Terasaki for 2. UVT is defective. Blockage of moving coil advice. Replace UVT. Consult Terasaki for 3. UVT or SHT circuit is defective. - Page 38 Symptom Possible cause Action/remedy 1. Main contact surface is worn and Replace ACB. roughened. 2. Contact lead is disconnected Replace ACB. (due to an excessive number of There is no continuity. operation cycles or corrosive gases). 3. Foreign materials are deposited ...
- Page 39 KRB-5200f...
- Page 40 Circuit Breaker Division 6-13-47 Kamihigashi, Hiranoku, Osaka 547-0002, Japan TEL +81-6-6791-2763 FAX +81-6-6791-2732 www.terasaki.co.jp kiki-info@terasaki.co.jp Published in January 1996 Revived in August 1999, September 1999, December 2000, December 2003, June 2016 The contents of this manual may be subject to change without notice.
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