R449 Leroy Somer Nidec Automatic Voltage Regulator Instructions

: August 24, 2024
: Nidec

Table of Contents

R449 Leroy Somer Nidec Automatic Voltage Regulator
1 – SAFETY INSTRUCTIONS
2 – CONTENTS OF THE KIT
3 – UPGRADING ANALOG REGULATOR
4 – WIRING PRECAUTIONS
Service & Support
Product Specifications:
FAQ:
- Q: What should I do if the generator stops due to voltage fluctuations?
Q: Is it necessary to use a Listed Class CC Fuse for power

R449 Leroy Somer Nidec Automatic Voltage Regulator

INSTRUCTION MANUAL

MODEL: SWITCH2D550

Instructions for upgrading an analog regulator by the D550 digital regulator

To watch our installation tutorial, scan the QR code
or or go to: www.lrsm.co/switch2d550

1 – SAFETY INSTRUCTIONS

For the user’s own safety, the D550 must be connected to an approved earth using the earth terminal shown above.
M4 female terminal. Useful depth 4 mm, tightening torque 1.2 Nm ± 0.2 Nm.

Tightening torque for user terminal is:

Connectors 3.5 mm pitch: 0.22 Nm min. to 0.25 Nm max.

Crimping power connectors (provided into the kit) must be done with a specific tool:

Tyco Electronics ref. 91500, 91510, 91508, 91506 or equivalent

For UL certified generators:

– Copper conductors, with adapted gauge and temperature rating at least 75°C must be used.
– Instrument transformers shall comply with basic insulation requirements defined in the Instrument Transformers standards (IEEE C57.13 series) or the equivalent.
– Protection for the power supply circuit by Listed Class CC Fuse (15A max.) or Listed inverse time circuit breaker (10A max.).
– Protection for the auxiliary DC supply by 1A fast acting fuse (Mersen 250FA 1A- E76491 or equivalent).

It is essential to comply with the power connection diagrams recommended in this manual.

The D550 includes devices which, in the event of problems, can de-energize or over excite the generator. The generator itself can also become jammed for mechanical reasons. Finally, voltage fluctuations or power cuts may also cause the unit to stop.

In an installation, the D550 is a device designed to be integrated into an electric cabinet or enclosed into the electrical machine, and can under no circumstances be considered to be a safety device. It is therefore the responsibility of the machine manufacturer, the designer of the installation or the user to take all necessary precautions to ensure that the system complies with current standards, and to provide any devices required to ensure the safety of equipment and personnel (especially direct contact with connectors when the AVR is running).

Nidec Leroy-Somer declines all responsibility in the event of the above recommendations not being observed.

Please refer to D550 instruction manual, available in Nidec Leroy-Somer website, to ensure installation and wiring. You must imperatively understand and comply with the safety instructions described in it.

2 – CONTENTS OF THE KIT

The SWITCH2D550 is a universal kit used for AREP, SHUNT or PMG excitation alternators.
It allows to replace the R449 regulator or other analog regulator, associated with an optional R726, R729, R731 or R734 module, by the D550 digital AVR whatever the type of alternator.

It contains:

1 D550 digital AVR
1 MATE-N-LOK set of cables (length 1 m)
1 USB cable

Optional: If your machine is not equipped with a terminal block, an optional terminal block kit can be supplied. This allows easy connection of the cables coming from your machine.

3 – UPGRADING ANALOG REGULATOR

3.1 – Mechanical arrangement

– Remove the panels from the terminal box to access to the analog regulator.
– Disconnect the FASTON connectors from the analog regulator, taking care to identify each wire.
– Unscrew and remove the analog regulator.
– Insert and screw the D550 AVR (M5 2.5 Nm ±1).
– Connect the five MATE-N-LOK connectors with foolproofs to the D550.

Terminal block on alternator side

– Cut the cables coming from your alternator as closed as the FASTON lugs then connect each of the wires coming from the alternator to the corresponding terminal on the terminal block.
– The use of an auxiliary 12/24 Vdc power supply (not included) is mandatory for the AVR to operate. This DC supply must be connected to the terminals + and – of the terminal block on the alternator side.

– Replace and tighten the lid of the terminal box.

3.2 – Electrical arrangement

Regulator wiring diagrams

Connection of the cables harness

D550 loom / faisceau D550 Existing wiring / câblage existant
Option / optionnal
Bornier / terminal

FUSIBLES/FUSES :
F1,F2 : temporisé / slow 500V or 250V / 10A F3 : temporisé / slow 500V or 250V / 1A

Inputs/ouputs connection

4 – WIRING PRECAUTIONS

– Particular care should be taken in maintaining the cables in the terminal box in order to avoid any damage due to frictions or vibrations.
– To adjust the length according to the alternator frame and the layout of the terminal box, it is recommended to form a curve with the cable set.
– Avoid direct contact between the cable set and any exposed electrical part (terminal block studs, stator cable lugs) or any part that could physically damage the sleeve or wires.
– The cable sets must be properly maintained to avoid damage due to vibrations.

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:

Contact us:
Americas: +1 (507) 625 4011
EMEA: +33 238 609 908
Asia Pacific: +65 6250 8488
China: +86 591 8837 3010
India: +91 806 726 4867

service.epg@leroy-somer.com

Scan the code or go to:

Service & Support
www.lrsm.co/support

Product Specifications:

Product Name: SWITCH2D550
Compatibility: Universal kit for AREP, SHUNT, or PMG excitation alternators
Regulator Type: D550 digital AVR
Power Supply: Requires an auxiliary 12/24 Vdc power supply (not included)

FAQ:

Q: What should I do if the generator stops due to voltage fluctuations?

A: In case of generator stoppage due to voltage fluctuations, refer to the D550 instruction manual available on the Nidec Leroy-Somer website for troubleshooting steps.