zxc ® 09-Dec-2012 16:42

Instruction manual for Twin Crane MHI Nagasaki / TDC control equipment (synchro-unit)


Year: 1983
Language: english
Author: NIPPON ELECTRIC INDUSTRY
Genre: Instruction manua
Publisher: NIPPON ELECTRIC INDUSTRY
Format: PDF
Quality: Scanned pages
Number of pages: 35+72
Description: INSTRUCTION MANUAL FOR TDC CONTROL EQUIPMENT (SYNCHRO-UNIT) JULY 4, 19S3 NIPPON ELECTRIC INDUSTRY CO.,LTD.-CONTENTS
1 . GENERAL.....................................1
5. PRINCIPLE OF OPERATION........................................2
6. IDENTIFICATION OF EACH PART...................................4
7. INSTALLATION AND ADJUSTMENT...................................7
8 . OPERATING PROCEDURES.........................................12
9. TROUBLE SHOOTING ...........................................14
10. SYNCHRO-TRANSMITTER INSPECTION...............................18
11. DC SOURCE INSPECTION.........................................19
12. RELAY REPLACING METHOD......................................2 0
13. CARD REPLACING METHOD........................................21
14. TEST FUNCTIONS................................................. 2 3-1 . GENERAL
This equipment is used for controlling KDIST and LUFFING functions of the Twin-Deck CraneAMAIN and SUB crane.
For HOIST and LUFF functions, the equipment carries out a synchronous control.
5. PRINCIPLE OF OPERATION
5.1 Method of Synchronous Control

When a control of identical speed is given to Main Crane (hereinafter called main) and to Sub-Crane (hereinafter called sub) from the control lever, if the speed characteristics of the main are different from those of sub, a deviation is produced in the position of two cranes When the deviation is smaller than certain value (Speed compensation dead zone), a signal from the control lever will be outout as it is.
When the deviation is larger than certain value, a compensation will be added to the speed control instructi ri in cr : :c aiike the deviation smaller.
In case of Fig. 1, the main lags behind the sub in the direction of travelling, so the value corresponding :o (speed :r.strJ: tion) + (compensation) will be given to main as instruction val:e. On the contrary, since the sub advances more t lan the main, it will receive (speed instruction) - (compensation) instruction.
In twin-operation node, the synchro-trar.. .ir.itter JeiActi a deviation between the main crane and sub-crane.
The deviation is converted into speed compensation signal in synchro unit, then added to or subtracted from the speed instruction signal given by the control lever, and is output as a speed signal.
Also, when the deviation between the mair and sub becomes larger than a set value (stop point), stop signal will be issued as the synchronism is no more available.
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