ABB HIEE405246R0002 UNS 0867A-P V2 Control board PLC module

Description

Acceleration control can be used for travel motions. Acceleration control is selected by setting parameter 07.01 to

14, 24 or 34. Different to speed control (Group 9) the driver only uses one regulator, the inner current control loop,

in acceleration control mode.

Acceleration control is preferably used for driver controlled travel motions, while speed control is used for hoist mo

tions.

Most crane drivers prefer acceleration control for their travel motions.

Speed control = Speed regulator + Current regulator

Acceleration control = Driver + Current regulator.

Steps 1, 2, 3 and 4 or an analogue reference give acceleration depending on the %-value of the parameters. The

%-value is not % of rated current, but a larger %-value gives a higher acceleration. The classic 10-25-50-100%

serve as first start up value. These values go straight through the speed regulator, and are not affected by speed

regulator gain parameters. Acceleration control has fixed ramp times, 250 milliseconds up to 100% and 0 (directly)

down.

When a limit switch is hit the motion will bumplessly transfer into speed control. It follows to selected retardation

ramp (parameter 08.03) to the level of slow down speed (08.16) or stop. Of this reason, the start up of an accelera

tion controlled motion must start with a, at least acceptable, speed control tuning with parameter 07.01 as 10, 20 or

30. Parameter 08.02 has no importance.

When the master switch is returned to its neutral position, i. e. the direction signals A and B disappear, the motion

will coast to roll by itself for a limited time; time set with parameter 10.15. After this time has elapsed, the speed

control will take over and bring the motion controlled to stand still in the same way as for limit switch stop. The time

should be assessed from installation to installation, but must always be so short that the “Hold to run” principle of

the Machinery Directive is not in danger. Using rotor frequency feedback the coast time is limited to practically 500

ms as the speed detection is blocked in coasting mode.

The brake is applied based on measured speed, level as decided by parameter 06.01.

As acceleration control has no defined speed feedback, there is no supervision of encoder/tachometer in this con

trol mode.

One can use a four step master switch, 4-3-2-1-0-1-2-3-4 or 3-2-1-coast-0-coast-1-2-3, or a five step master

switch, 4-3-2-1-coast-0-coast-1-2-3-4. For a five step version DAPM 200 / 201 is needed. The coast-position re

quires that an encoder or tachometer is installed to detect the actual speed also in time without any rotor voltage.

Acceleration control with tachometer or pulse encoder can be realised with no (most common), one or two rotor

contactors. If one contactor is used, it corresponds to K2 in below single line diagram, and if two are used these

correspond to K2 and K3 in the single line diagram. With rotor frequency feedback a contactor K3 is needed. K3

can be installed there most convenient in either end of the resistance unit. See the single line in top of next page.

With acceleration control the current limit can be set lower than with speed control, which gives an indication of its

friendliness to the mechanical drive gear. Parameter 11.01 most common settings are between 100% and 175%

with acceleration control.

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