F-27
b) When using a braking resistor without thermal fuse
(*1) Connection when using an MCCB with a top coil instead of an MC.
(*2) A step-down transformer is required for 400V models but not for 200V models.
[Parameter setting]
Title
Function
Adjustment range
Setting value
Dynamic braking
mode selection
: Disabled
: Enabled with over load detection
PBR resistor
〜
[
Ω
]
Any value
(*3)
PBR resistor capacity
〜
[kW]
Any value
(*3)
(When the standard internal braking resistor option is not used, be sure to set the parameters F308
and F309 properly for overload protection.)
(*3)
is for overload protection of our optional PBR and PBR3 type. Please consider the
protection at external thermal for DGP type.
※
A thermal relay (THR) must be connected as the last resort for fire prevention in case a failure
occurs in the overload and over-current protective functions provided for the inverter to protect the
braking resistor. Select and connect a thermal relay (THR) with a capacity (watt) commensurate
with that of the braking resistor used.
- Caution -
In the above circuit, the MC in the main circuit is turned off if an inverter's protective function is
activated, and consequently no trip message is displayed. The inverter recovers from a trip if it is
turned off. So, check the trip history record after turning off the inverter and then on again. (Refer
to 8.1.)
To prevent a trip condition from being cleared by turning off the power and then on again,
change the setting of the inverter trip retention selection parameter F602. (Refer to 6.25.3)
*
Control power unit option
(
22kW or less
)
In a circuit where a control power supply
is connected to RO and SO, when the
MC in the main circuit is turned off when
a trip is occurred, trip data is saved so
that trip messages can be displayed (FL
output also is retained.) For optional
control power supply units, refer to 9.4.
When using a custom braking resistor, be sure to select a braking resistor with a resistance larger
than the minimum admissible resistance. Refer to 4 on the next page for the minimum admissible
resistance.
IM
Motor
TC
MC
R
S
T
U
V
W
PA
FLB
PB
F
FLC
FLA
G/E
R
CC
External braking resistor
(optional)
Fuse
2:1
(*2)
(*1)
MC
MCCB
Power
supply
Power
supply
THR
Surge killer
Forward/stop
Reverse/stop
*
If no power supply is provided
for the control circuit
Inverter
MC
R
S
T
R0
S0
22kW or less
Option