Site 3

Control & Protection Relays
Industrial Automation
PC Monitoring & Control

Site Visit

Site	Putrajaya Site Office
Date	14-9-1999
Products	HOKKIM HAMF-1 Integrated AMF Control Board
Switchboard Manufacturer	Yuniletrik Sdn Bhd
Description	Control panel for 70 KVA generator.
Comments	At this site, it was found that the gen-set fail to start after being in operation for some time because the 8-pin base of the start relay has melted. The damaged units were replaced with a new base and a new relay. It is important to use good quality start relays and bases because the start circuit carries high current. It was discovered that the Mains Failed Timer Card (MFT-1) transistor C1815 was also damaged (open-circuit). A replacement MFT-1 was installed. With that the problem was resolved and the AMF board was able to function properly. After 3 months, the AMF board failed again. This time the MFT-1 Card was found not functioning properly because there was an induced voltage of 60VAC across terminals 11 & 12 of the HAMF-1. These are supposed to be volt-free contacts used for signaling the auto-start circuit. The 60VAC was induced because the wiring contractor used a four-core armored cable to connect to terminals 11 & 12. The balance 2 core of the cable was used for the battery-charger 240VAC power supply and the cable was run over a long distance. To solve this problem, the contractor was asked to run separate cables for power and signal.

Site Photos

View of the Gen-Set	View of the panel board
Closer view of the panel board and Hokkim Hamf	A = 4-Core Cable B = Starter Relay C = Solenoid Coil Relay

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