YASKAWA A1000 Technical Manual page 428

8.5 Installing Peripheral Devices

Installing a Braking Resistor Unit: LKEB type
LKEB type braking resistors provide dynamic braking capability with up to 10% ED. They can be directly connected to
the drives B1 and B2 terminals as shown in
utilized in order to switch off the drive in case braking resistor overheat occurs.
As the drives internal braking resistor overload protection cannot protect LKEB resistors, disable this function by setting
L8-01 to 0.
Figure 8.17

Installing Other Types of Braking Resistors
When installing braking resistors other than the ERF or LKEB types, make sure that the drive internal braking transistor
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 switch off the drive in case of braking resistor overheat.

Braking Resistor Overload Protection
If using a braking resistor option, a sequence such as the one shown in
power supply in case the braking resistor overheats.
Figure 8.18
WARNING! Fire Hazard. Set up the sequence to shut off the power at the thermal relay trip contact on the braking resistor unit, as
shown in Figure 8.20, to protect the braking resistor unit from overheating.
If the power was shut off, turn the power back on after identifying the cause of the problem. Disconnect the braking resistor unit if the
power needs to be turned on to investigate the cause of the problem.
428
Figure
B1
Drive
B2
Figure 8.19 Connecting a Braking Resistor Unit: LKEB Type
(CIMR-A2A0004 to 2A0138, 4A0002 to 4A0072)
Circuit Breaker
R
S
T
400/200V
THRX OFF
1 2
Braking Resistor Unit
(Close: Overheat)
Figure 8.20 Power Supply Interrupt for Overheat Protection (Example)
8.19. The LKEB unit has a thermal overload contact that should be
Braking Resistor Unit
(LKEB type)
P 1
B 2
Figure 8.20
MC
R/L1
S/L2
T/L3
ON MC
SA
MC
THRX
SA
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Thermal Relay
Trip Contact
should be set up to interrupt the
Drive