8.5 Installing Peripheral Devices
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 367
Peripheral Devices &
Options
8
8.5 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 (UL standard) 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.
◆ Dynamic Braking Options
A braking resistor or an external braking transistor combined with a braking resistor must be installed in order to dissipate
the energy fed back to the drive during regenerative operation.
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 the braking resistor instruction manual when connecting a braking resistor option to the drive.
Note: The braking circuit must be sized properly in order 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.
WARNING! Fire Hazard. The braking resistor connection terminals are B1 and B2. Do not connect a 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.
NOTICE: Connect braking circuits 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 Braking Resistors
WARNING! Fire hazard. Always use braking resistors that are equipped with a thermal overload relay contact, and utilize this contact
to switch off the drive in case of braking resistor overheat. When connecting the braking resistors to the drive internal braking transistor,
make sure the braking transistor will not be overloaded with the required duty cycle and the selected resistance value. Failure to
comply could result in death or serious injury by fire from overheating resistors.
Always use braking resistors equipped with a thermal overload relay contact, and utilize this contact to switch off the
drive in case of braking resistor overheat. When connecting the braking resistors to the drive internal braking transistor,
make sure the braking transistor will not be overloaded with the required duty cycle and the selected resistance value.
Figure 8.16
Figure 8.18 Power Supply Interrupt for Overheat Protection (Example)
Drive
MC
Circuit Breaker
R
S
T
R/L1
S/L2
T/L3
SA
SA
400/200V
MCON
MC
OFF
THRX
Braking Resistor Unit
(Close: Overheat)
12
MC
2MCCB
MB THRX
SIEP_C710616_38F_5_0.book 367 ページ ２０１５年１１月９日 月曜日 午後３時３６分
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