Problem In Abb Servo Motor Drive

Dear Friends,

I am extremely worried about frequent malfunctioning of ABB Servo Motor Drives installed in the Splicer units of our recently installed second hand Corrugator machine. There are five splicers in machine and each has two same drives. Drive # 1 (Reel Launch) works only when operator splices the next paper reel at the end of paper on running reel. This drive just only stops a running roll and then re-moves during the splice sequence. Drive #2 (Dancer Roll) always works which controls the tension of web whatever the machine speed. PLC gives two different reference signal (0-10v), Speed reference and Torque reference.
There are three PCBs inside a drive;
1) Mother PCB having power circuit and power supply
2) Control & Memory PCB (having back up battery)
3) Connection PCB having terminal blocks for control wiring and a 7 segment displayer.

During last one year, both drives in different splicers malfunctioned for 7 times. Most of the time, the problem appeared in second (Memory) PCB that the 7 segment displayer displayed an error but all the related things were ok. If we installed another god drive in the place of that malfunctioned drive, it worked correctly. Only two times the problem appeared in first (power) PCB. The repairing of drive is almost impossible as it has very small electronic components. I had four spare drives which I replaced with four malfunctioned drives and then used the good PCB of that malfunctioned drives for repairing other three malfunctioned drives. This time I don’t have any spare good drive

I talked with machine supplier but they did not give me proper answer. ABB has also been stopped the manufacturing of that drive for a long time. Now I am wondering what to do.
Please help me out. I want to know why I have been facing such problem with this drive and what to do now so that no more drive would be malfunctioned.

The type of drive and motor is as following;

Drive ABB
AC Servo Motor Drive, 12.4KVA, 19A, 400V, 3phase
Type Bivector 535 "18" Ser# 00128-04

Servo Motor ABB with Resolver
Type 8C543000V002SN3MB Ser# BS024019

Any help would be highly appriciated.

Anyone Familiar With "vacon" Inverters?

I have Vacon brand inverter (5.5 CXS4A2IA) installed in one part of my Corrugator machine. The inverter controls the speed of motor which rotates a shaft having slitting tools. I want that when I enable the inverter and speed reference = 0V, it provide 5HZ output frequency to motor (like an idle speed) but there is no any parameter found except "Minimum Speed". When I set a value in this field, the inverter adds such value in out put frequency when I provide 0-10VDC signal to drive.

For example, if I set 0-10V = 0-100HZ, means 1volt = 10HZ and then set a value say 5 in "Minimum Speed", now drive provides almost 5HZ if speed reference = 0 but if I give a speed reference 1volt, the out put frequency, which should be 10HZ, increases at almost 15HZ.

Normally there is a parameter in inverters "Minimum Frequency" and if we set a value in this parameter, the drive provides same output frequency when it enables and the speed reference = 0V.

Please help how I can set the idle speed of the motor connected with this inverter.

Literature On Frequency Inverters

Dear All

I want to deeply study about the operation of frequency inverters and there parameters because some time we don’t know about the function of some parameters in inverter. Anyone knows about any website?

Installation Of Shunt

Dear All

We have a DC drive 220KW for a DC motor 218KW 400V in our Corrugator machine. I want o install three digital ampere meters for displaying the armature current of motor at three different places. One meter would be installed at DC drive panel and two would be installed about 40meters away from DC drive panel. Please assist if is it possible with only one SHUNT or I would have to install one shunt for each meter?

Testing Of Servo Motor By Inverter.

Dear All

I have a Parker brand SBC Servo motor 335VAC 0.62kw which is controlled by a servo motor drive. The motor consist of winding, thermister, brake and a Resolver for feed back to drive. When I started the motor with servo drive, it draw unbalance current and motor shaft vibrated. I checked the winding and found ok. Then I concluded that problem was in the Resolver. I tested the drive by connected another servo motor and found ok. I tried to test the motor without Resolver connected but when I disconnected the resolver, drive went in to fault. Is it possible to test the Servo motor by Inverter instead of Servomotor Drive?