ABB GKKA2121GO11 GKKAC7689 DCS output module

Description

It is monitored that a Step 1 speed reference gives any response from the speed feedback device in a short

time. If the motion is not able to start within a few 100 ms due to a slow opening brake, the function

for handling slow opening brake should be adjusted before the supervision time for the tachometer

supervision is set longer.

Parameters that are active: 10.12, 10,13 and 10.15

Remark: Rotor frequency feedback is supervised electronically.

ASTAT cannot be reset in the usual way after an overspeed trip. If there is an overspeed trip DO no. 8 of

DATX 110 will open. It cannot be closed or the ASTAT will not be ready for new service until the 230 (115)

V AC control voltage has been off and on again. See also Sections 2.3 Crane power and control volt

age and 4.22, Options for Fault handling. This function is not available for share motion drives.

The speed can be compared for an absolute high value, see parameters 10.01 and 10.02.

With setting 10.01 = 3 the trip level can be temporary changed to only 40% of the synchronous speed by

making DI no. 15 active. This is particularly for testing the safety system at a lower speed than 125% of the

synchronous.

The function is tracking the actual speed from the speed reference. It can only be used for hoists with ta

chometer or pulse encoder.

In case it finds an abnormal state, it sets a fault flag, gives code 91, and can not be reset by OFF like Over

speed faults. It opens DATX110 DO8 (emergency stop) depending of the selection of parameter 10.30

USE_OVSP. The function is developed to make an early stop with the working brakes of the high speed

side in case there is an electrical fault, and avoid to stress the emergency brakes and rest of the drive sys

tem as far as possible.

The function can as well be used for hoists without any emergency brakes, and in that case it can emer

gency trip the whole crane

Parameters that are active: 10.30, 10.31, 10.32, 10.33, 10.34 and 10.35. This system is new from 10_05.

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