YASKAWA
YASKAWA AC Drive-Option
BRAKING UNIT,
BRAKING RESISTOR UNIT
INSTRUCTIONS
MODEL: BRAKING UNIT CDBR-
BRAKING RESISTOR UNIT LKEB-
Upon receipt of the product and prior to initial operation, read these instructions thoroughly, and retain for future reference.
YASKAWA
MANUAL NO. TOBP C720600 00C
PREFACE
Braking resistor unit and braking unit are used to consume regenerative energy from motor in the braking resistor unit at deceleration and to improve the transistor inverter braking ability.
Before using the braking resistor unit and braking unit, a thorough understanding of this manual is recommended. This instruction manual will be of great help for daily maintenance, inspection and troubleshooting.
Inverters to which the braking resistor unit and braking unit can be connected are of the following series:
D
YASKAWA AC Drive 1000 Series
D
Varispeed Series
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General Precautions
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Some drawings in this manual are shown with the protective cover or shields removed, in order to describe with more clarity. Make sure all covers and shields are replaced before operating this product.
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Since the drawings in this manual are represented examples, some are subject to differ from delivered products.
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This manual may be modified when necessary because of improvement of the product, modification or changes in specifications. Such modifications are denoted by a revised manual No.
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To order a copy of this manual, if your copy has been damaged or lost, contact your YASKAWA representative.
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YASKAWA is not responsible for any modification of the product made by the user since that will void your guarantee.
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NOTES FOR SAFE OPERATION
Read this instruction manual thoroughly before installation, operation, maintenance or inspection of the braking unit and the braking resistor unit. In this manual, NOTES FOR SAFE OPERATION are classified as “WARNING” or
“CAUTION.”
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury to personnel.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury to personnel and damage to equipment.
It may also be used to alert against unsafe practices.
Even items described in
CAUTION
may result in a vital accident in some situations. In either case, follow these important notes.
NOTE
: These are steps to be taken to insure proper operation.
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WIRING
WARNING
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Only commence wiring after verifying that the power supply is turned OFF.
Failure to observe this warning can result in an electrical shock or a fire.
(Ref. page)
27
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High voltage exists at all terminals of braking unit and braking resistor unit.
Failure to observe this warning can result in an electrical shock.
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Wiring should be performed only by qualified personnel.
Failure to observe this warning can result in an electrical shock or a fire.
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When wiring the emergency stop circuit, check the wiring thoroughly before operation.
Failure to observe this warning can result in personal injury.
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Make sure to ground the ground terminal .
(Ground resistance
200V class: 100Ω or less, 400V class: 10Ω or less)
Failure to observe this warning can result in an electrical shock.
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Short Circuit Current Rating (SCCR)
Install adequate branch short circuit protection according to applicable codes.
Failure to comply could result in damage to the drive.
The device is suitable for circuits capable of delivering 31,000 RMS symmetrical Amperes, 240 Vac maximum (200V Class), 480 Vac maximum (400V
Class) and 575Vac (600V Class) or the SCCR rating of the drive it is connected to, which ever is greater.
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CAUTION
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Verify that the rated voltage of the braking unit and the braking resistor unit coincides with the AC power supply voltage.
Failure to observe this caution can result in personal injury or a fire.
(Ref. page)
27
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Do not perform a withstand voltage test of the braking unit and braking resistor unit.
It may cause semi−conductor elements to be damaged.
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Connect braking resistors, braking resistor units, and braking units as shown in the I/O wiring examples. Use properly rated wire in accordance with table 2 on page 31.
Otherwise, a fire can occur.
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Tighten terminal screws to the specified tightening torque.
Failure to observe this caution can result in a fire.
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Be sure to connect braking resistors or braking resistor units to the braking units.
If neither braking resistor nor braking resistor unit is connected to a braking unit, the fault contact may instantaneously turn ON when the power is turned ON, resulting in malfunction of the inverter.
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OPERATION
WARNING
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Only turn ON the input power supply after replacing the front cover. Do not remove the cover while current is flowing.
Failure to observe this warning can result in an electrical shock.
(Ref. page)
41
CAUTION
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Never touch the heatsink or discharging resistor since the temperature is very high.
Failure to observe this caution can result in harmful burns to the body.
(Ref. page)
41
41
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Do not check signals during operation.
The machine or the inverter may be damaged.
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Alltheconstantsofthethebrakingunit andthe brakingresistor unit have been preset at the factory. Do not change the settings unnecessarily.
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