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British-Army-FV342587-Control-Panel-Alternator-No-1-Mk-1-MOD-Refurbished
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Details about  British Army FV342587 Control Panel, Alternator, No.1, Mk 1 - MOD Refurbished

British Army FV342587 Control Panel, Alternator, No.1, Mk 1 - MOD Refurbished

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woods-group-devon
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Item information

Condition:
Used
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£165.00
 
 
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Item location:
crediton, Devon, United Kingdom
 
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Collection in person only
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Payments:
International postage and import charges paid to Pitney Bowes Inc. Learn More- opens in a new window or tab
Returns:
14 days refund, seller pays return postage See details
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eBay item number:
390451623315
Seller assumes all responsibility for this listing.
Last updated on  24 Nov, 2014 04:58:09 GMT  View all revisions
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Item specifics

Condition:
Used: An item that has been previously used. See the seller’s listing for full details and description of ... Read moreabout the condition
Era: 1945-Present
Country/ Organization: Great Britain Service: Army
Issued/ Not-Issued: Issued

woods-group-devon

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British Army FV342587 Control Panel, Alternator, No.1, Mk 1

Genuine British Army
FV342587 Unit.

Rotax gave the code number for the associated voltage regulator as U6107. The FVRDE number is
FV342587 and in Army service it became Control Panel Alternator No.1 Mk 1.
..read more after photo`s...

We have a number of these units; we will pick the best of the bunch, as each are sold.

Dimensions :: 11" x 7" x 4"

Pick up only or courier can be arranged at extra cost.

As photo -

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Rotax gave the code number for the associated voltage regulator as U6107. The FVRDE number is
FV342587 and in Army service it became Control Panel Alternator No.1 Mk 1. The regulator was a major step forward in that it was entirely solid state and was not hampered by the limitations of carbon pile or electromechanical systems. This meant not only improved efficiency and reliability but it could handle higher currents over a wider temperature range, be easier to waterproof, require less maintenance, generate less heat and radio interference. There are a total of fifteen transistors but the heart of the system is the inclusion of two silicon-controlled rectifiers (SCRs).

The SCR is a rectifier that can be switched on and off by a pulse, the width of the pulse is
controlled by the output voltage from the alternator. The SCR is used to control the current in the alternator field winding and regulates the alternator output to 28.5 volts within 2%. Although two alternators share a common rectifier unit, they must each have their own control panel. The panel
provides a range of functions:


Field supply -
The alternator is self-excited, this means that the supply for the field winding is derived from the generator output. The control panel provides the field supply and adjusts it via the SCRs to regulate alternator output. Self-excitation relies on there being some residual magnetism within the alternator, however vibration and shock can destroy this residual magnetism. To ensure the alternator can start to function under all conditions a small “tickle” current from the batteries is passed to the field supply. On reaching normal output the three small diodes in the alternator energise a relay to remove this energising current.

Field over-heat protection -
Although the alternator is oil cooled, the temperature of the oil can get very high. This is particularly likely when the alternator is delivering high current at low speeds. There is a risk that the PTFE insulation may breakdown at high temperatures, to avoid this, field temperature sensing is provided. There is no direct temperature sensing it is done in the control panel by measuring the voltage to and current through the field winding. This is because voltage and current are a function of resistance and resistance is a function of temperature. So when the field temperature exceeds 250 degrees centigrade then the field voltage is reduced, thereby producing a fall in alternator output until it has cooled down.

Field current limiting -
A vehicle left standing for long enough will assume the temperature of the environment. Under freezing
conditions the resistance of the field winding will be lowered resulting in a current of about 70 amps. So current limiting circuitry is incorporated into the control panel to prevent the field current exceeding 30 amps.

Control panel environmental stability -
Although the control panel will not be subject to the high temperatures of the alternator or rectifier unit, it still will be subject to a wide range of ambient temperatures. To compensate for this, feedback circuits ensure that the regulator will function normally from –40 to +55 degrees centigrade. By modern standards the upper temperature limit seems rather low, but the control panel is just cooled by natural convection. Feedback circuits also prevent unfavourable oscillations building up over a wide range of speed, loads and temperature. Direct vibration is reduced by the three main component boards being mounted on metal panels supported by antivibration posts; the control box is mounted on four shockproof mountings. The complete unit is sealed to make it completely waterproof.

Battery overheating -
Particularly in tropical conditions, there is a danger of the batteries overheating. The system has provision for a thermal switch to be fitted to the batteries. An undue rise in temperature is detected by the control panel and causes the normal alternator output of 28.5 volts to fall to 27.5 volts.

Dual sensing -
Normally the regulator reference voltage is obtained from the main DC output line. If for any reason this reference should fail, then the regulator makes use of the stand-by sensing output provided by the rectifier unit.

Radio frequency interference suppression -
Although there is less RF interference than with mechanical regulators, the control panel incorporates 12 feed through capacitors to minimise any interference.

Load sharing -
The full charging system incorporates two alternators and it is important that each alternator provides its fair share of output. Each control panel receives voltages in proportion to its alternator’s output and corrections are made. The normal practice is for generators that are dynamos to be covered in EMER POWER section ‘P’ together with their generator panels and generator panels for alternators. But in this generating system the panel distinguishes itself by being allowed to be included with its parent alternator in section ‘W’.




Condition unknown - sold as seen, no returns.


Business seller information

Woods-Group
The Old Cider Works Crediton Devon EX17 1HJ United Kingdom Tel :: 01363 776604 Tel :: 01363 772503
VAT number: GB 142129988
Print version

Returns policy

After receiving the item, cancel the purchase within
Return postage
14 days
Seller pays return postage
The seller is responsible for return postage costs.
Return policy details
Returns Policy: 1. We are happy to replace any goods that buyers are unhappy with on condition they are returned to us within 14 days of receipt in the same condition they were received, if a replacement is not available we will refund the purchase price via the same method payment was made. 2. We will do my utmost to provide customer satisfaction - refunds & returns on items are accepted. If there is any problem whatsoever with your order please contact us and help us solve the problem before leaving feedback. We will always do our utmost to satisfy fully. 3. We do not accept partial returns on multiple best offer buy`s, all items need to be returned to satisfy this return request. 4. Other returns policies may apply to vintage items - these will be displayed on each vintage item listing.
Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab.

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Seller assumes all responsibility for this listing.

Postage and packaging

Item location: crediton, Devon, United Kingdom
Postage to: Will arrange for collection only (no delivery).

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........no returns accepted on used untested vintage items sorry -
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