Installing A Molded Case Circuit Breaker (Mccb) - YASKAWA T1000A Technical Manual

8.5 Installing Peripheral Devices
Figure 8.8
Figure 8.8 Connecting a Braking Unit (CDBR type) and Braking Resistor Unit (LKEB type)
n
Using Braking Units in Parallel
When multiple braking units are used, they must be installed with a master-slave configuration with a single braking unit
acting as the master. Figure 8.9
Wire the thermal overload contacts relays of all CDBRs and all braking resistors in series, then connect this signal to a
drive digital input. This input can be used to trigger a fault in the drive in case of overload in any of the CDBRs or
braking resistors.
Figure 8.9
u Installing a Molded Case Circuit Breaker (MCCB)
Install a MCCB for line protection between the power supply and the main circuit power supply input terminals R/L1, S/
L2, and T/L3. This protects the main circuit and devices wired to the main circuit while also providing overload
protection.
Consider the following when selecting and installing a MCCB:
• The capacity of the MCCB should be 1.5 to 2 times the rated output current of the drive. Use a MCCB with an
operation characteristics so that the MCCB does not trip faster than the drive overload protection works (shuts off the
drive after 1 min. operation at 150% of the drive rated current).
• If several drives are connected to one MCCB, use a sequence that shuts the power OFF when an error occurs in one
drive by using magnetic contactor (MC) as shown in the following figure.
344
Braking Unit
(CDBR type)
3 +
+
Drive
−
−
3
Thermal Relay
Trip Contact
(CIMR-T 2A0169 to 0415, CIMR-T 4A0088 to 0362)
illustrates how to wire braking units in parallel.
(Thermal Relay Trip Contact)
+ −
3
1
P
− + + 0
MASTER
Drive
SLAVE
1
2
Braking Unit 1
3
Cooling Fin Overheat Contact
(Thermoswitch Contact)
Figure 8.9 Connecting Braking Units in Parallel
Braking Resistor Unit
(LKEB type)
+ 0
P
− 0 B
4
Braking Resistor Braking Resistor
Overheat Contact Overheat Contact
(Thermal Relay Trip Contact)
Braking
2 1
Resistor
Unit
B P
− 0
− + + 0 − 0
MASTER
+15 SLAVE
5
1
6
2
Braking Unit 2
4 3 4
Cooling Fin Overheat Contact
(Thermoswitch Contact)
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
1
Thermal Overload
Protector Trip Contact
2
Braking Resistor
Overheat Contact
(Thermal Relay Trip Contact)
Braking Braking
2 1 2
Resistor Resistor
Unit Unit
B P B
− + + 0 − 0
MASTER
SLAVE
5
1 5
6
2 6
Braking Unit 3
3 4
Cooling Fin Overheat Contact
(Thermoswitch Contact)