YASKAWA Varispeed G7 Series Instruction Manual page 260

Related Constants
Name
Con-
stant
Display
Number
Overvoltage
inhibit selection
Used to enable or disable the
function for inhibiting main cir-
cuit overvoltages by reducing the
regenerative torque limit accord-
L3-11 ing to the main circuit overvoltage
level.
OV Inhibit Sel
If this function is enabled, when
the main circuit voltage rises,
operation will be performed with
the regenerative torque less than
the set value.
Overvoltage Sets the main circuit voltage level
inhibit voltage for which the regenerative torque
level limit is restricted to 0.
Usually, there is no need to
L3-12
change this setting. If main circuit
OV Inhbt
overvoltages occur even with the
VoltLv1
overvoltage inhibit function
enabled, reduce this setting.
* These values are for a 200 V Class Inverter. For a 400 V Class Inverter, double the values.
Setting Precautions
When this function is enabled, if the main circuit voltage rises, the regenerative torque limit will decrease to a
value less than its set value and so the motor will not rotate at the speed specified by the speed reference.
Therefore, in applications where it is necessary to rotate the motor at the speed specified by the speed refer-
ence, disable this function and use a converter, a dynamic braking resistor, or a power regenerative unit to sup-
press rises in the main circuit voltage.
Description
0: Disabled
1: Enabled
Acceleration and Deceleration Characteristics
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0 or 1 0 No No No
350 to
380
No No No
*
V*
390
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A A A 4C7H
A A A 4C8H
27
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