Unitor HPC Extreme 520 Specifications Page 186
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2012.03 / e
LEROY-SOMER
Installation and maintenance
R 450
AVRs
4531 en -
3.3 - U/F and LAM function
3.3.1 - Frequency variation compared
with voltage (without LAM)
100 %
50 Hz 60 Hz
Hz
50 Hz
48 Hz
57.5 Hz
60 Hz
Voltage
Bend
U/U
N
Frequency
3.3.2 - LAM (Load Acceptance Module)
characteristics
3.3.2.1 - Voltage drop
The LAM system is integrated in the AVR. As
standard it is active.
Role of the LAM:
On application of a load, the genset rotation
speed decreases. When it falls below the
preset frequency threshold, the LAM causes
the voltage to drop proportionately to the
frequency (LAM1) or to the active power
(LAM2) depending the the rotating switch
position. This reduces the active load scale
applied until the speed returns to its rated
value.
Hence the LAM can be used either to reduce
the speed variation (frequency) and its
duration for a given applied load, or to
increase the applied load possible for one
speed variation (turbo-charged engine).
To avoid voltage oscillations, the trip
threshold for the LAM function should be set
approximately 2 Hz below the rated
frequency.
LAM
U
N
0
48 or 58 Hz
0,85 UN
Voltage
Voltage
U/f
50 or 60 Hz
fC
fN
ST3
3.3.2.2 - Soft voltage recovery function
During load impacts, the function helps the
genset to return to its rated speed faster with
a gradual increase in voltage according to
the principle:
- If the speed drops between 46 and 50 Hz
(in 50Hz operation), the rated voltage is
recovered by following a fast gradient.
- If the speed drops below 46 Hz, since the
engine needs more help, the voltage follows
a slow gradient as it returns to the reference
value.
0
Time
Drop N 46 Hz
U
Drop N > 46 Hz
3.4 - Typical effects of the LAM with
a diesel engine with or without a
LAM (U/F only)
3.4.1 - Voltage
3.4.2 - Frequency
UN
0
0,9
0,8
(U/f)
with
LAM
Time
without LAM
1 s 2 s 3 s
Transient voltage drop
0,9
0,8
f
N
Max. speed drop
0
with
LAM
Time
without
LAM
1 s 2 s 3 s
184/209
- User and maintenance manual 1
- WARNING 2
- 1. Preface 5
- 1.1. General recommendations 5
- 1.3.1 General advice 10
- 1.4. Identifying sets 14
- 2. General description 16
- 2.1. Description 16
- 2.3. Fuel and consumables 21
- 2.3.1 Specifications 21
- 2.3.1.1. Oil grades 21
- 3. Installation 23
- 3.1. Unloading 23
- 3.1.2.1. Slings 23
- 3.1.2.2. Fork lift truck 24
- 3.2. Fluid retention 24
- 3.3. Choice of location 26
- 3.4. Electricity 27
- 3.5. Special arrangements 29
- 4. Trailer 29
- 4.1. Trailer linkage 29
- 4.2. Check before towing 29
- 4.3. Operation 30
- 4.4. Unhitching the trailer 30
- 4.7. Faults and repairs 33
- 5.1. Installation checks 35
- 6. Using the generator set 35
- 6.1. Pre-Start Inspection 35
- 6.2.2 Manual starting 40
- 6.2.3 Switching off 41
- 6.2.4 Alarms and faults 41
- 6.3.2 Starting 57
- Open the circuit breaker 58
- Press the STOP button 58
- Alarms 59
- Faults 59
- 6.3.4.5. Horn reset 63
- 7. Maintenance schedule 64
- 7.1. Reminder of use 64
- 7.2. Engine 64
- 7.3. Alternator 64
- 8. Battery 65
- 8.1. Storage and transport 65
- 8.3. Check 66
- 8.4. Load preconization 67
- 8.5. Faults and remedies 68
- 9. Appendix 69
- 33522077701_0_1 71
- OPERATOR’S MANUALp 73
- Foreword 74
- Table of contents 75
- Safety information 76
- Fire and explosion 78
- Hot surfaces and fluids 78
- Chemicals 78
- Electric welding 79
- Introduction 80
- Certified engines 81
- Warranty 81
- Presentation 82
- Identification numbers 84
- Instruments 86
- Starting the engine 87
- Starting in extreme cold 88
- Never use start spray 89
- Stopping the engine 91
- Maintenance schedule 92
- Maintenance 94
- Engine Oilgrade 96
- Oil level. Inspection 97
- Viscosity 97
- Oil change volume 97
- Oil and oil filters. Change 98
- Coolant. Mixture 100
- Water quality 100
- Coolant. Checking and filling 101
- Coolant. Draining 102
- Drain/vent taps. Location 102
- Cooling system Flushing 103
- External cleaning 103
- Fuel system 104
- Fuel system. Venting 105
- Fuel filter. Change 105
- Electrical system 106
- Battery. Maintenance 107
- Batteries, charging 108
- Component location 109
- Laying up 110
- Fault tracing 111
- Diagnostic function 112
- Operation 113
- Fault codes 114
- Technical data 120
- Including clutch and frame 121
- Lubrication system 123
- Fuel specification 124
- Cooling system 125
- Yes please 129
- Oui merci 129
- Sì, grazie 130
- Sí gracias 130
- Ja tack 130
- Ja graag 131
- Kyllä kiitos 131
- Sim, obrigado(a)! 131
- Îòïðàâüòå ýòîò òàëîí 132
- 7745131 English 06-2007 134
- 01/03/2012 137
- 33522061001_8_1 137
- LSA 46.2 - 4 POLES 139
- 2011.01/ h 140
- 3856 en 140
- 338 567 258 RCS ANGOULÊME 162
- 4067 en - 2009.05 / b 163
- 4067 en - 2009.05 / b 164
- (U/F only) 169
- 3 - INSTALLATION 170
- COMMISSIONING 170
- 3.2 - Settings 170
- Installation and maintenance 175
- 2012.03 / e 176
- 4531 en 176
- 1 - GENERAL INFORMATION 178
- 1.1 - Description 178
- 1.2 - Characteristic 178
- 2 - POWER SUPPLY 179
- 2.1 - AREP excitation system 179
- 2.2 - PMG excitation system 180
- R 450 181
- Diagram 1 183
- I exc(A) 183
- Diagram 2 184
- 1 PHASE SENSING 185
- 3 PHASES SENSING 185
- 3.3 - U/F and LAM function 186
- LAM (U/F only) 186
- 3.5 - AVR options 187
- 4.2 - Setting up 188
- Field forcing 190
- Rental Power 195
- GENCOOL 196
- 196
- ALTERNATOR 196
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