AC70 VC CONTROL FREQUENCY INVERTER MANUAL
FUNCTION PARAMETER DETAILED SPECIFICATION
76
E-16
Frequency reference given
by digital keypad
Rang: lower limit frequency-upper limit
frequency
Default:50.00Hz
It uses to set or modify frequency reference when the frequency given channel is set to operator keypad digital
given.
Shortcut setting is available as well, changing the frequency reference via up/down arrow key of operator keypad
when inverter running or in standby mode.
E-17
V/F curve mode
Range:0-4
Default: 0
E-18 Torque
boost
Range:0.0%-25.0%
Default:
※
V/F curve mode:
Uses to select V/F curve mode to meet various of load characteristic requirement. AC70 vector
control inverter provides 4 kinds of fixed V/F curve and one kind of user defined V/F curve. Constant torque curve is
optional for general load and descend torque curve is optional for square torque load such as water pumps and
fans load.etc.
0: Constant torque curve
1: Descend torque curve(1.5 power curve)
2: Descend torque curve(1.7 Power curve)
3: Descend torque curve(2.0 Square curve)
4: User define curve :Inverter runs base on user defined V/F curve,
[E-18]
function is disable, User can program
appropriate V/F curves according to the load characteristic, for details please refer to
[H-01-H-10]
.
Torque boost:
When
[E-00]
is set to 1(V/F control mode), it is used to enhanced torque output under low
frequency running through output voltage boost compensation, when
[E-00]
is set to 0 ( OLV control without PG ),
the torque boost improvement follows vector control mode,
[E-18]
setting parameters is disable.
Torque boost value selecting should be according to load inertia. If the boost value is too big, will result in motor
overexcited running, and motor over heat easily, even worst, inverter will occurs over current fault protection, or
can’t start inverter properly.