Nidec LSA 52.3 - Page 18

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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18
RUNNING CHECKS
WITH EXCITATION - AT NO LOAD CONDITIONS
• Verification of the temperature of the bearings (refer to chapter 2.5.1 or 2.6.2) °C_____________
• In manual mode: Voltage setting ___________________________________
Excitation current check ___________________________________
• In automatic mode: Voltage Setting (referring to nominal voltage) ________________________
Excitation current check ________________________
• Parallel coupling: Adjustment for parallel operation (3F) ___________________________________
FAULTY SYNCHRONISATION CAN LEAD TO DAMAGE (HIGH MECHANICAL OVER-TORQUE)
• Maximum acceptable values for synchronisation with the mains:
Maximum frequency shift 0.1 Hz _________________________
Maximum Phase offset 10 ° _________________________
Maximum voltage (P.N.) difference 5% of Un _________________________
Control / Adjustment of the site safety parameters
• Over-voltage _____________________________________________________________
• Over-current (by short-circuit on stator in separate excitation mode) _________________________
• Negative sequence relay _____________________________________________________________
• Over-speed _____________________________________________________________
• Differential protection (in static conditions) _____________________________________
• Other protective device _____________________________________________________________
CHECK THAT ALL SAFETY EQUIPMENT OPERATES CORRECTLY.
WITH EXCITATION - LOADED
Take the load gradually from 0 to 100% in steps of 25%.
Record for each step (refer to Section 1):
• Electrical output (KW)
• POWER FACTOR
• Voltage (V)
• Current (A)
• Excitation Current / voltage
• Winding temperature
Time
KW
pf
Volts
I (A)
I (ex)
U1 (°C)
V1 (°C)
W1 (°C)
• Temperature of the bearings (if thrust sensor available, please record its value)
Time
DE Thrust (°C)
DE Radial (°C)
NDE Radial (°C)
• Oil inlet temperature (if applicable;
refer to Section 1)
• Oil flows (if applicable;
refer to Section 1)
• Vibrations of the bearings (mm/s)
(refer to chapter 2.1.3.4)
DE-V
DE-H
DE-A
DE-V
DE-H
DE-A
All maintenance must be carried out by a qualified and authorised person.