8.5 Installing Peripheral Devices
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 343
Peripheral Devices &
Options
8
n 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 Figure 8.6. The LKEB unit has a thermal overload contact that should be
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 8.6
Figure 8.6 Connecting a Braking Resistor Unit: LKEB Type
(CIMR-T2A0004 to 0138, T4A0002 to 0072)
n 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.
n
Braking Resistor Overload Protection
If using a braking resistor option, a sequence such as the one shown in Figure 8.7 should be set up to interrupt the power
supply in case the braking resistor overheats.
Figure 8.7
Figure 8.7 Power Supply Interrupt for Overheat Protection (Example)
n Installing a Braking Unit: CDBR Type
To install a CDBR type braking unit, connect the drive’s B1 terminal (units CIMR-T2A0004 to 0138 and CIMR-
T4A0002 to 0072) or +3 terminal (units CIMR-T2A0169 to 0415 and CIMR-T4A0088 to 4A0362) to the positive
terminal on the braking unit. Next wire the negative terminals on the drive and braking unit together. Terminal +2 is not
used.
Connect the braking resistor to the CDBRs terminals +0 and -0.
Wire the thermal overload relay contact of the CDBR and the braking resistor in series, and connect this signal to a drive
digital input. Use this input to trigger a fault in the drive in case a CDBR or braking resistor overload occurs.
Disable dynamic braking transistor protection by setting L8-55 = 0.
Braking Resistor Unit
(LKEB type)
Thermal Relay
Trip Contact
B1
B2
P1
B2
Drive
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
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