Wiring Examples; Using A Braking Resistor Unit - YASKAWA Varispeed F7 Instruction Manual

Wiring Examples

This section provides wiring examples to connect a Braking Unit and other peripheral devices to the main
circuits, examples of wiring a transformer to Inverter I/O, and other aspects of Inverter wiring.

Using a Braking Resistor Unit

This example shows wiring for a Braking Resistor Unit.
CIMR-F7A20P4 to -F7A2018 (200 V Class Inverters of 0.4 to 18.5 kW)
CIMR-F7A40P4 to -F7A4018 (400 V Class Inverters of 0.4 to 18.5 kW)
-22
10
A sequence is required to turn
OFF the power supply for the ther-
mal overload relay trip contacts of
the Braking Resistor Unit.
Short-circuit bar
3-phase power
200 to 230 V 50/60 Hz
or 380 to 460 V
50/60 Hz
Overload relay trip contact
of Braking Resistor Unit
Fault contacts
Braking Resistor overheating contacts
(Thermal overload relay trip contacts)
DC Reactor to
improve input
power factor
Braking Resistor Unit
(Optional)
MC
R/L1 U/T1
V/T2
S/L2
T/L3 W/T3
Inverter
* 1. A transformer is not required for 200 V Class
* 2. Remove the short-circuit bar (normally connected) from + 1 and + 2 when connecting
a DC Reactor (Optional).
* 3. Disable stall prevention during deceleration by setting L3-04 and using a Braking
Resistor Unit. The motor may not stop within the deceleration time if this setting is
not changed.
* 4. When connecting an separately-installed type Braking Resistor Unit (model CDBR)
to Inverters with built-in braking transistor (200 V/400 V 18.5 kW or less), connect
the B1 terminal of the Inverter to the + terminal of the Braking Resistor Unit and con-
nect the − terminal of the Inverter to the − terminal of the Braking Resistor Unit. The
B2 terminal is not used in this case.
Fig 10.9
*3
Motor
200 V Class Inverters: Ground to
100 Ω max., 400 V Class Inverters:
Ground to 10 Ω max.)