V&T V5 Series User Manual page 4

Profile of high performance crane special inverter
◆ Professional crane function, it is a perfect combination of PLC and
high-performance vector inverter.
Built-in unique crane special functions for V&T crane special inverter are a perfect
combination of crane special PLC and high-performance vector inverter. Its powerful, easy
programming ,wiring and cost-effective.
◆ Powerful starting torque in low frequency
The product adopts precise torque vector control algorithm, vector control without encoder
0.5Hz up to 180% rated torque, the torque response is less than 20ms; vector control with
encoder 0.00Hz up to 180% rated torque, the torque response is less than 10ms. With
reliable brake control logic, to ensure opening and closing of the brake will not appear slip
phenomenon.
◆ Reliable brake control to eliminate the phenomenon of slip hook
Precise torque vector control algorithm combined with a reliable brake control logic, to
ensure opening and closing of the brake will not appear slip phenomenon.
The first thing to start motor is to ensure that the motor has reached a certain frequency, the
output torque was sufficient to open the mechanical brake and after process mechanical
brake delay can normally accelerate to the setting speed; when stop motor, first of all let the
motor as reasonable deceleration gradually decelerate to the brake close speed, and let
the motor still output torque, then closed mechanical brake.Through the above functions
can be better able to prevent the load slip hook at the moment of opening and closing the
brake.
Start command
Motor running
Frequency given
f1
Frequency output
shut down
Brake command
shut down
Brake status
Brake is the most crucial and most important institutions of crane system. Reliability of brake
relates to safety of whole machine. Except the brake control time sequence to ensure reliable
f2
t1 t2
turn on
turn on
I>Ilift
T>Tlift
f1:Brake opening frequency (forward/reverse)
f2:Brake delay frequency (forward/reverse)
f3:Brake closing frequency (forward/reverse)
f4:Slip delay frequency (forward/reverse)
f4
t1:Delay before the brake is opened
t2:Brake open delay
f3
t3:Slip delay time
t3
I:Output current
T:Output torque
Ilift:Brake open current (forward/reverse)
Tlift:Brake opening torque (forward/reverse)