S.M.Services (UK) Ltd
SM32 Fail Safe
Specifications
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Size.
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46mm x 28mm x 20mm
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Construction.
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Boxed.
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Connections.
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Via Fly Leads with plugs and sockets. Wired for Futaba/JR.
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Supply Voltage.
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2.5v to 10.0v DC.
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Supply Current.
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9mA Approx., plus servo current. @ 4.8v.
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Output.
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Follows input except during fail safe operation when signal width is adjustable between 1 and 2mS in 6.25% steps.
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Description
This module is a micro computer controlled signal monitoring system.
Two main failure modes are checked for, corrupt signals and total signal loss.
As each servo pulse is received it is measured and only passed to the servo if it is within a pre-set width band. Any pulses that fail this test cause the computer to repeat the last valid pulse received, this will be repeated 66 times (approximately 2 seconds) before entering fail-safe mode. A valid pulse during the period prior to entering fail safe mode will reset the failure counter. Once fail-safe mode has been entered the computer will only exit upon receipt of 20 valid pulses (approximately 0.5 seconds).
If no pulses are received within 30mS (nominal frame rate plus 5mS) the computer will repeat the last valid pulse received, this will be repeated 66 times before entering fail-safe mode. A valid pulse during the period prior to entering fail-safe mode will reset the failure counter. Once fail-safe mode has been entered the computer will only exit upon receipt of 20 valid pulses.
Once the computer enters fail-safe mode it will generate a pulse whose width is determined by the user set switch, any pulse size between 1 and 2mS in 6.25% steps can be set.
To set up the fail-safe servo position first connect the fail-safe between the receiver and the servo, switch on the TX and RX and check servo operation, then switch off the TX and the servo will move to a set position, adjustment of the fail-safe position can now be carried out.
Standard Receiver Wiring Connections
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Lead Function
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Futaba
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JR/Sanwa(new)
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Hitec
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Sanwa Old Style(Moulding Numbers)
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+= Positive
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Red
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Red
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Red
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3
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- = Negative
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Black
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Brown
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Black
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2
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IP = Signal
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White
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Orange
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Yellow
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1
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WARNING
1. Do not reverse positive and negative leads. (Red and Black).
2. Always remove power from the module before connecting or disconnecting any input or output connection, failure to observe these instructions can destroy the module.
3. Always range check when adding or changing the control system of a model.
4. This module has been tested for use on UK 35 MHz aircraft frequency, use on other frequencies is at the users risk.
YOUR GUARANTEE
S.M. Services (UK) Ltd guarantee all products for 1 year from date of purchase. During this time S.M. Services (UK) Ltd will repair or replace all defective products free of charge, except for units subject to fair wear and tear, or units that are subject to crash damage. To qualify for benefits under the guarantee you must have installed and used the product in accordance with S.M. Services (UK) Ltd instructions. Consequential losses and accidental damage to the product are not covered by the guarantee. S.M. Services (UK) Ltd cannot be responsible for results of using our products for any purposes other than those described in the relevant instructions.
RETURNS
Any returned products ordered in error or are not required will if returned unopened in original product packaging within 28 days from date of purchase be subject to a full refund less shipping charges and a 5% handling charge. All other returns will be subject to a full refund less shipping charges and a 20% handling charge.
S.M.Services (UK) Ltd
18 Orchard Way, Cranfield, Beds. MK43 0HU.
Tel.01234 751095