Electrical Equipment Numbering System

The electrical equipments are numbered in accordance with "CATALYTIC - KULJIAN's PROJECT PROCEDURE MANUAL" as follows:


The prefix letters identifying the electrical equipments in this plant are as
follows:
SG    - 7.2KV metal-clad switch-ear
US    - secondary unit substation
BD    - bus duct
MCC    - motor control center
TR    - transformer board
DB    - power panel, power distribution panel, DC distribution board
L P        - 11ga-rg panel
R           - battery charger
BA        - battery
N            - power receptacle, air conditioning control panel, relay box, interface 
                 panel, etc.
P(EM)     - motor for pump
A(EM)     - motor for agitator
F(EM)     - motor for filter or screen
C( EM)    - motor for fan or blower `:
M( EM)    - motor for handling equipment

M.V Motors (6.9 Kv) – Vertical-

Trouble	Cause	Remedy
1- Doesn't rotate        (No-sound).	- Connections not complete. - Defected circuit between supply and motor terminals (Disconnection – bad connection). - Stator circuit open. - Single phase connection (burn fuse).	- Check circuit for disconnection or bad connection. -  Check terminals. - Check stator coil and replace it if necessary. - Check fuses and replace it.
2- Over load trips         at starting	- Defected starter. - Short circuited coil. - Mechanical jam.	- Check starter and repair or replace it. - Check stator coil and replace if necessary. - Check if the load locked. - Check coupling, and ensure the alignment. - Check the air-gap clearance and adjust it. - Check bearing and replace if necessary.
Trouble	Cause	Remedy
3- Noise and      vibration	- 1 phase operation (worn fuses – circuit disconnections). - Unbalance voltages. - Mechanical fault. - Vibration from load. - Unsymmetrical coupling.	- Check all phases - Replace worn fuse - Dissemble the motor and check rotor bars. - Check air-gap clearance and adjust it. - Find out any foreign matters - Check shaft. - Check end rings. - Check coupling and adjust it. - Check load fixing screws.
4- Extreme temperature and smoke.	- Up-normal high voltages. - Up-normal low voltage. - Wrong frequency. - Weak cooling. - Over load. - Burn coil. - Mechanical fault	- Check supply voltage and     frequency and adjust it. - Check cooling system and melt    water. - Check if the load is over or there is some other faults in load. - Check stator winding and repair it or replace it. - Check air-gap clearance. - Check bearing temperature and lubrication system. - Check alignment.
5- Defected bearing.	- Oil deterioration. - Excess motor pushing. - Wrong thrust bearing erection.	- Check oil for:-    a. foreign matters.    b. lake of oil. - Check oil cooling system - Check if there is a shaft current. - Replace bearing.