Cooling-Fan Operation Setting (B092) - Hitachi SJ700B Series Instruction Manual

4.2.37 Dynamic braking (BRD) function
The dynamic braking (BRD) function is provided in the
SJ700-220LFF/HFF and other models that have the built-in BRD circuit.
With this function, the energy regenerated by the motor is consumed by
an external resistor (i.e., the energy is converted to heat). You can
effectively use this function in your system, for example, to operate the
motor as a generator by rapidly decelerating the motor.
To use this function, make the following settings:
Item Function code
Dynamic braking
usage ratio
Dynamic braking
control
Dynamic braking
activation level
*1 The set dynamic braking activation level specifies the DC output voltage of the inverter's internal
converter.
*2 Please refer P2-22 for minimum resistance of connectable resistor and BRD ratio (2.2.5).
4.2.38 Cooling-fan operation setting
The cooling-fan operation setting function allows you to specify the
operation mode of the inverter's internal cooling fan. The cooling fan can
be operated on a constant basis or only while the inverter is driving the
motor.
Item Function code
Cooling fan
control
Note: The cooling fan stops automatically when instantaneous power failure occurs or the inverter power is
shut off and resume the operation after power recovered.
Data or range of data
b090 (*2)
0.1 to 100.0 (%)
b095
330 to 380 (V) (*1)
b096
660 to 760 (V) (*1)
Data or range of data
b092
Chapter 4 Explanation of Functions
0.0 Disabling the BRD operation
Setting of the dynamic braking usage ratio in units
of 0.1%
The inverter will trip when the set rate is exceeded.
BRD
operation
Usage rate (%) =
00 Disabling the BRD operation
Enabling the BRD operation while the motor is
running
01
Disabling the BRD operation while the motor is
stopped
Enabling the BRD operation regardless of whether
02
the motor is running
Level setting for 200 V class models
Level setting for 400 V class models
00 Specifying that the fan operates on a constant basis
Specifying that the fan operates only while the
inverter is driving the motor.
01
Note that the fan operates for 5 minutes after the
inverter power is turned on and after the inverter is
stopped.
4 - 45
Related code
b090: Dynamic braking usage ratio
b095: Dynamic braking control
b096: Dynamic braking activation level
Description
t1 t2
ON ON
100 seconds
(t1+t2+t3)
× 100
100 seconds
Related code
b092: Cooling fan control
Description
t3
ON