Yaskawa A1000 6-Phase/12-Pulse Input - Manual (Page 32)

u Installing Peripheral Devices
This section describes the proper steps and precautions to take when installing or connecting various peripheral devices to the
drive.
NOTICE: Use a class 2 power supply when connecting to the control terminals. Improper application of peripheral devices could result in
drive performance degradation due to improper power supply. Refer to NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control,
Signaling, and Power Limited Circuits for requirements concerning class 2 power supplies.
n Dynamic Braking Options
Dynamic braking (DB) helps bring the motor to a smooth and rapid stop when working with high inertia loads. As the drive
lowers the frequency of a motor moving a high inertia load, regeneration occurs. This can cause an overvoltage situation when
the regenerative energy flows back into the DC bus capacitors. A braking resistor prevents these overvoltage faults.
Refer to CDBR manual TOBP C720600 00 or TOBP C720600 01 when connecting a dynamic braking option to the drive.
NOTICE: Do not allow unqualified personnel to use the product. Failure to comply could result in damage to the drive or braking circuit.
Carefully review CDBR manual TOBP C720600 00 or TOBP C720600 01 when connecting a dynamic braking option to the drive.
Note: 1. Properly size the braking circuit to dissipate the power required to decelerate the load in the desired time. Ensure that the braking circuit
can dissipate the energy for the set deceleration time prior to running the drive.
2. Set L8-55 to 0 to disable the internal braking transistor of the drive protection when using braking resistor options.
WARNING! Fire Hazard. The dynamic braking resistor connection terminals are B1 and B2 on models 4T0058 o and 4T0072o. Do not
connect a dynamic braking resistor directly to any other terminals. Improper wiring connections could result in death or serious injury by fire.
Failure to comply may result in damage to the braking circuit or drive.
WARNING! Fire Hazard. The CDBR dynamic braking unit connection terminals are ⊖ and ⊕3 on models 4T0088o to 4T0675o. Do not
connect a CDBR dynamic braking unit directly to any other terminals. Improper wiring connections could result in death or serious injury by
fire. Failure to comply may result in damage to the braking circuit or drive.
NOTICE: Connect dynamic braking to the drive as shown in the I/O wiring examples. Improperly wiring braking circuits could result in damage
to the drive or equipment.
Installing a Dynamic Braking Resistor
Dynamic braking resistors connect to drive terminals B1 and B2 on models 4T0058o and 4T0072o as shown in Figure 17 .
Utilize the thermal overload contact to switch off the drive in the event of braking resistor overheat.
The internal braking resistor overload protection of the drive cannot protect dynamic braking resistors. Set L8-01 to 0 to disable
this function.
Dynamic Braking Resistor
Thermal Relay
Trip Contact
B1
B2
P 1
B 2
Drive
Figure 17 Connecting a Dynamic Braking Resistor
Installing Other Types of Dynamic Braking Resistors
When installing non-Yaskawa dynamic braking resistors, make sure that the braking transistor in the braking unit will not be
overloaded with the required duty cycle and the selected resistance value. Use a resistor that is equipped with a thermal overload
relay contact, and utilize this contact to disconnect main power to the drive in case of braking resistor overheat.
6 Drive Options and Peripheral Devices
32 YASKAWA TOEP YAIA1U 02A YASKAWA AC Drive – A1000 6-Phase/12-Pulse Input Installation Manual