ABB GFD233A 3BHE022294R0103 Module Interface Card

Description

When the |speed| is faster than set by parameter 09.09, the motor will accelerate to slightly more than the

synchronous speed, and reverse the active energy to the mains taking the magnetising power from the

mains. This regenerative mode is possible only for motions with a load that pulls with a higher speed than

the synchronous, like hoists.

At first Start Up of the system. provoke the worst conditions with largest load and tap the apply transformer

for low voltage. In that situation, at notching back from Super synchronous lowering, check that the gain

parameters 09.02 and 09.03 are large enough to pick up the load from falling through.

For hoists setting parameter 09.08 to 1 activates the regenerative lowering.

From AST10_05 the super-synchronous “motoring” in lowering direction is ended already when the full

speed notch of the master switch disappears. The advantage is that the speed error will not have time to

increase and give a larger current pulse/torque pulse in the motor when the speed reference else must

ramp back to (standard value) 85%, which typically results in a speed error of 105% – 85% = 20% when the

regulator once more becomes active. With the new function the speed error is typically 105% – 100% = 5%,

which gives a lower current impact.

4.9.1.6.2. Additional for rotor frequency controlled hoists

From AST10_03A a function is included that makes the notch back after super synchronous lowering for

hoists with rotor frequency control at least as fast as for those with tachometer or encoder control.

During super synchronous lowering the lowering current is memorised. At notching back the rotor contac

tors are opened, and during the time set with 09.34 a current 09.33 times the memorised current is injected

in braking direction. After this time, it is back to normal speed control

From AST10_04C, it is possible to modify the performance of the function; most modifications are made to

reduce the fast notch back and allow a small load droop!

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