5.3 Installing Peripheral Devices
50 YASKAWA ELECTRIC TOEP C710616 50B YASKAWA AC Drive - A1000 6-Phase/12-Pulse Input Installation Guide
Using Braking Units in Parallel
Only A1000 model CIMR-A4T0675 can accept up to two braking units. Smaller 6-Phase/12-Pulse models are not
compatible with parallel (more than one) braking units.
Installing Other Types of Braking Resistors
When installing braking resistors other than the LKEB type, 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.
Braking Resistor Overload Protection
If using a braking resistor option, a sequence such as the one shown in Figure 5.2 is recommended to interrupt the power
supply in case the braking resistor overheats.
Figure 5. 1
Figure 5.2 Power Supply Interrupt for Braking Resistor Overheat Protection (Example)
185 (300)
Normal Duty 0362
4220
1
Heavy Duty 0414 1
220 (350)
Normal Duty 0414
4220
1
Heavy Duty 0515 1
250 (400-450) Normal Duty 0515 4220 1
315 (400-450-500) Heavy Duty 0675 4220 2
355 (500-550) Normal Duty 0675 4220 2
<1> A braking unit cannot be connected to the CIMR-A4T0058 and 0072 drives.
<2> A braking resistor can be connected to the B1 and B2 terminals on the CIMR-A4T0058 and 0072 drives.
Max. Applicable Motor
kW (HP)
Drive Duty
A1000 Drive Braking Unit
Max Allowable Qty
CIMR-A4T CDBR-
Drive
400 V
MC
Y
㰱
㰱
R/L1
S/L2
T/L3
R1/L11
S1/L21
T1/L31
R
S
T
Braking Unit
(CDBR Type)
<1>
Braking Resistor Unit
(LKEB Type)
<2>
12
+3 -
MC
2MCCB
MB ON
OFFTHRX
SA
1
2
TRX
MC
MA
TRX
Fault Relay
Contact
Braking Resistor Unit
Thermal Relay Trip Contact
MC
MC
SA
SA
THRX
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