Braking Resistor Unit
(LKEB type)
Thermal Relay
Trip Contact
B1
B2
P
1
B
2
Drive
Figure 8.9 Connecting a Braking Resistor Unit: LKEB Type
(Models 2A0004 to 2A0138, 4A0002 to 4A0072, and 5A0003 to 5A0052)
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
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
If the drive must be energized to investigate the cause of the problem, disconnect the braking resistor unit before energizing
the drive.
If the drive was de-energized, identify the cause of the problem before re-energizing the drive.
Drive
MC
Circuit Breaker
R
S
T
R/L1
S/L2
T/L3
SA
SA
200/400/600 V
MC
ON
MC
OFF
THRX
THRX
Braking Resistor Unit
(Close: Overheat)
1
2
3
4
CDBR
Thermal
Relay Trip
Contact
Figure 8.10 Power Supply Interrupt for Overheat Protection (Example)
n
Installing a Braking Unit: CDBR Type
To install a CDBR type braking unit, connect the
⊕
3 terminal of the drive to the positive terminal on the braking unit.
Next, wire together the negative terminals on the drive and braking unit. Terminal
⊕
2 is not used.
Connect the braking resistor to CDBR terminals
⊕
0 and
⊖
for proper configuration.
Wire the thermal overload relay normally open contacts of the CDBR and the braking resistor in parallel, and connect this
signal to a control circuit as shown in
to interrupt the main input power supply to the drive in the event of a CDBR
or braking resistor overload.
Set L8-55 to 0 to disable dynamic braking transistor protection.
8.5 Installing Peripheral Devices
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
383
8
Peripheral Devices & Options
