Increasing Starting Torque By Output Voltage Boost - Reliance electric GV3000/SE Instruction Manual

H.003

Increasing Starting Torque by Output Voltage Boost

Parameter Range: 0.0% - 20.0% of nominal motor voltage
Initial Setting: 0.5%
Type: Configurable (at standby only)
Refer to: H.000 Motor Nameplate Volts
Description:
This parameter sets the percentage of output voltage
boost at zero frequency. It is set as a percentage of
Motor Nameplate Volts (H.000).
The Voltage Boost decreases with higher frequency and
is zero at nominal frequency.
Torque boost is required to offset the voltage drop of
the A-C motor at low speeds. For high friction loads and
high inertia loads, high starting torque may be needed.
Increasing Torque Boost Voltage will increase motor
starting torque.
When H.003=0, the drive automatically provides torque
boost voltage that is a function of motor resistance. Via
Identification procedure (H.020) the stator resistance is
evaluated, an IR-compensation is provided.
H.003>0 :If the torque boost voltage setting is too high,
the motor may draw excessive starting current, resulting
in an OL or PUo fault, or the drive may go into current
limit and not accelerate. If the motor does not
accelerate or a fault occurs, decrease parameter value
H.003.
Application:
H.003=0 only if high starting torque on single motor applications is requested!
H.003>0 settings are recommended, on
- Current Limit (P.005) requested below value of Motor Nameplate Amps (H.002).
Consider the application limits described at Current Limit (P.005).
- Multi-motor applications to compensate for higher IR-drop of lower Hp motors.
5 - 4
5 - V/HZ REGULATION MODE
GV3000/SE
Voltage Output
%
100
Torque Boost
H.003 = 2%
constant
V/Hz Ratio
Base Frequency
2
0
Frequency Output, Hz
Fig. 5-2: Torque Boost Voltage
at mode "Constant V/Hz Curve"
(Refer to H.018)
49'1329 e