ABB 3ASC25H208 DATX100 PLC board
Notes for use of analogue reference
Using direct driver joystick potentiometer control introduces some disadvantages that must be considered.
A) Analogue reference does not prevent critical speeds resulting in shaking of the structure and resonance in active mechanical parts.
B) With step control an important supervision of tacho/encoder based on smallest speed can be done
C) With step control a more robust hardware can be used, no potentiometer or uncertain quality PLC is needed.
D) For a Travel motion, the torque requirement can be 20 times during speed change than in steady state driving.If the speed is changed for every small movement of the joystick, the wear of the crane will be larger.
E) For a Hoist motion with short ramp times the ratio defined in previous bullet D) with empty hook is the same as for a travel motion, and 2,5 times when the crane is loaded to its nominal capacity. The cranes are sometimes
empty, and most of the time they are loaded with less than the nominal load. Assume that the weighted average is 6 times. If we can reduce the time the speed is changed, the life of the mechanisms and the structure will be much longer.
F) Sitting in a moving crane or using a radio remote control, it is not possible at all to maintain a fixed speed with potentiometer control.
ABB 3ASC25H208 DATX100 PLC board
ABB 3ASC25H208 DATX100 PLC board
Delayed start for brake testing
The start can be delayed for testing of brakes. The testing can be made with approx. 160% of the rated motor torque with all rotor contactors open with value 08.19 = 1, or with 220% of the rated motor torque by K1 closed with 08.19 = 2. The normal value is 08.19 = 0 that does not cause any reference delay for brake testing.Brake testing has higher priority than Slow opening brake compensation. If 08.19 has another value than 0,whichever setting of 08.21 is overridden the Slow opening brake compensation is not effective.The referenced is delayed during the time set by 08.24. During this time the brakes are not lifted. The controller tries to reach a current same as set current limit, parameter 11.01, which in most cases is not possible or needed. The target direction is B, meaning lowering for hoists.If the value of the maximal measured speed is larger than set by parameter 10.12 we have a fault, code 90.If the value of the maximal measured speed is less than set by parameter 10.12 during this time, the brake testing is passed, and the controller turns to a state for normal running.
ABB 3ASC25H208 DATX100 PLC board PDF
3ASC25H208 DATX100
ABB 3ASC25H208 DATX100 PLC board
ABB 3ASC25H208 DATX100 PLC board
Speed dependent gain
For most applications better servo drive properties can be obtained by varying the gain vs. the speed reference. Typically the proportional gain can be increased for the low speed range.Between the fixed breakpoints 10, 25, 50% and full speed there is interpolation of the values.From release 10_054 a new breakpoint 0% speed is available for P- and I-gain.The experience-based default values will serve well in nearly all applications.For most applications better servo drive properties can be obtained by varying the gain vs. the speed reference change state.For motion control with regular requirements, that is nearly all industrial cranes, leave the default values of 09.35 (Integral) and 09.40 (Proportional part) unchanged. The defaults give 50% reduction of the I- and 25% reduction of the P-gain during steady state motion compared to the gains during speed change state.
ABB 3ASC25H208 DATX100 PLC board
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