Nidec R221 AVR Leroy Somer Amp Board Instruction Manual

: July 29, 2024
: Nidec

Table of Contents

Nidec R221 AVR Leroy Somer Amp Board
SAFETY MEASURES
POWER SUPPLY
R221 AVR
INSTALLATION
SPARE PARTS
FAQ
Service & Support
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Nidec R221 AVR Leroy Somer Amp Board

Nidec-R221-AVR-Leroy-Somer-Amp-Board-product

This manual concerns the alternator AVR which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual.

SAFETY MEASURES

Before using your machine for the first time, it is important to read the whole of this installation and maintenance manual.
All necessary operations and interventions on this machine must be performed by a qualified technician.

Our technical support service will be pleased to provide any additional information you may require.
The various operations described in this manual are accompanied by recommendations or symbols to alert the user to potential risks of accidents. It is vital that you understand and take notice of the following warning symbols.

WARNING

Warning symbol for an operation capable of damaging or destroying the machine or surrounding equipment.

Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.

All servicing or repair operations performed on the AVR should be undertaken by personnel trained in the commissioning, servicing and maintenance of electrical and mechanical components.
When the generator is driven at a frequency below 28 Hz for more than 30 seconds with an analogue AVR, its AC power supply must be disconnected.

WARNING

This AVR can be incorporated in a ECmarked machine.
This manual is to be given to the end user.

WARNING

The AVR R221 is dedicated for the alternators LSA40 and LSA423 single phase (50Hz/60Hz). It is particularly recommended for applications in which the alternator’s voltage difference between no-load operation and load operation is out of ISO8528-3 class G2.
The R221 is an IP00 product. It must be installed inside a unit so that this unit’s cover can provide IP20 minimum total protection (it must only be installed on our alternators in the appropriate location so that when viewed externally, it has a higher degree of protection than IP20).

POWER SUPPLY

SHUNT excitation system

The alternator with Shunt excitation is selfexcited with an R221 voltage regulator.
The regulator monitors the exciter excitation current as a function of the alternator output voltage. Very simple in design, the alternator with shunt excitation has no sustaining short-circuit capacity.

R221 AVR

Characteristics

Storage: -55°C ; +85°C
Operation: -40°C ; +65°C
Voltage regulation: ± 0.5%
Voltage supply/sensing range 85 to 139 V (50/60 Hz)
Rapid response time (500 ms) for a transient voltage variation amplitude of ± 20%
Voltage setting P1
Stability setting P2
Power supply protected by 8 A fuse, slowblow action (tolerates 10 A for 10 s) The fuse is impregnated in the resin, therefore it can not be replaced.
Frequency: 50 Hz with ST3 jumper – 60 Hz without ST3 jumper.
The size of the screwdriver tip used to adjust the potentiometer is 2.5 mm.

AVR options

Potentiometer for remote voltage adjustment, 1000 Ω / 0.5 W min: adjustment range ± 5%.

Remove the ST4 jumper.

For wiring up the external potentiometer; the “earth” wires must be isolated as well as the potentiometer terminals (wires at the same voltage as the power).

SHUNT SYSTEM

Nidec-R221-AVR-Leroy-Somer-Amp-Board-fig-3

INSTALLATION

COMMISSIONING

Electrical checks on the AVR

Check that all connections have been made properly as shown in the attached wiring diagram.
Check that the ST3 frequency selection jumper is on the correct frequency setting.
Check whether the ST4 jumper or the remote adjustment potentiometer have been connected.

Settings

The machine is tested and set at the factory. When first used with no load, make sure that the drive speed is correct and stable (see the nameplate). After operational testing, replace all access panels or covers.
The only possible adjustments to the machine should be made on the AVR.

R 221 setting (SHUNT system)

Initial potentiometer settings

P1 potentiometer (AVR voltage adjustment): fully anti‑clockwise.
Remote voltage adjustment potentiometer: centre position.
Run the alternator at its rated speed. If the voltage does not increase, the magnetic circuit should be remagnetized (see section 3.3).
Turn the AVR voltage adjustment potentiometer P1 slowly until the output voltage rated value is obtained.
Adjust the stability setting using P2.
- Clockwise: increase the rapidity.
- Anti-clockwise: decrease the rapidity.

Special type of use

WARNING

Excitation circuit E+, E- must not be left open when the machine is running : AVR damage will occur.

R221 field weakening (SHUNT)

The exciter is switched off by disconnecting the AVR power supply.
Contact rating: 16A – 250V AC.
The power supply contactor must only be closed when the alternator is not being driven.

R221 field forcing

Warning

Battery must be isolated from the earth.
Exciter field may be at line potential.

Electrical faults

Fault	Action	Effect	Check/Cause
No voltage at no load on start-up	Connect a new battery of 4 to 12 volts to
terminals E- and E+, respecting the polarity, for 2 to 3 secon	The alternator
builds up and its voltage is still correct when the battery is removed	– Lack

of residual magnetism
The alternator builds up but its voltage does not reach the rated value when the battery is removed| – Check the connection of the voltage

reference to the AVR

– Faulty diodes

– Armature short-circuit

The alternator builds up but its voltage disappears when the battery is removed| – Faulty AVR

– Field windings open circuit (check winding)

– Revolving field coil open circuit (check the resistance)

Voltage too low| Check the drive speed| **** Correct speed| Check the AVR connections (AVR may be faulty)

– Field windings short-circuited

– Rotating diodes burnt out

– Revolving field coil short-circuited (check the resistance)

Speed too low| Increase the drive speed (do not touch the AVR voltage setting before running at the correct speed)
Voltage too high| Adjust AVR voltage potentiometer| Adjustment ineffective| – Faulty AVR

– 1 faulty diode

Voltage oscillations| Adjust AVR stability potentiometer| | – Check the speed : possibility of cyclic irregularity

– Loose connections

– Faulty AVR

– Speed too low when on load (or U/F bend set too high)

Voltage correct at no load and too low when on load (*)| Run at no load and check the voltage between E+ and E- on the AVR| | – Check the speed (or U/F bend set too high)
– Faulty rotating diodes

– Short-circuit in the revolving field coil (check the resistance)

– Faulty exciter armature (check the resistance)

*() Caution:** For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to

the operating terminals.

Voltage disappears during operation| Check the AVR, the surge suppressor, the rotating diodes and replace any defective components| ****

The voltage does not return to the rated value

| – Exciter winding open circuit

– Faulty exciter armature

– Faulty AVR

– Revolving field coil open circuit or

short-circuited

SPARE PARTS

Designation

Description	Type	Code
AVR	R221	AEM 110 RE 042

Technical support service

Our technical support service will be pleased to provide any additional information you may require.
For all spare parts orders or technical support requests, send your request to service.epg@leroy-somer.com or your nearest contact, whom you will find at www.lrsm.co/support indicating the type and the code number of the AVR.
To ensure that our products operate correctly and safely, we recommend the use of original manufacturer spare parts.
In the event of failure to comply with this advice, the manufacturer cannot be held responsible for any damage.

Disposal and recycling instructions

We are committed to limiting the environmental impact of our activity. We continuously monitor our production processes, material sourcing and product design to improve recyclability and minimise our environmental footprint.
These instructions are for information purposes only. It is the user’s responsibility to comply with local legislation regarding product disposal and recycling.

Waste & hazardous materials

The following components and materials require special treatment and must be separated from the alternator before the recycling process:

electronic materials found in the terminal box, including the automatic voltage regulator (198), current transformers (176), interference suppression module and other semi-conductors.
diode bridge (343) and surge suppressor (347), found on the alternator rotor.
major plastic components, such as the terminal box structure on some products.

These components are usually marked with information concerning the type of plastic.
All materials listed above need special treatment to separate waste from reclaimable materials and should be entrusted to specialist recycling companies.

FAQ

Frequently Asked Questions

Q: What should I do if the generator is driven at a frequency below 28 Hz?
- A: When the generator is driven at a frequency below 28 Hz for more than 30 seconds with an analogue AVR, its AC power supply must be disconnected to prevent damage.
Q: Can the AVR be incorporated in an EC-marked machine?
- A: Yes, this AVR can be incorporated in an EC-marked machine. Ensure that the manual is provided to the end user for reference.

Service & Support

Our worldwide service network of over 80 facilities is at your service.
This local presence is our guarantee for fast and efficient repair, support and maintenance services.
Trust your alternator maintenance and support to electric power generation experts.
Our field personnel are 100% qualified and fully trained to operate in all environments and on all machine types.
We have a deep understanding of alternator operation, providing the best value service to optimise your cost of ownership.

Where we can help:

Nidec-R221-AVR-Leroy-Somer-Amp-Board-fig-6