Warner Fail-Safe Spi�dl�. �.rak,�
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. .
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This Unit is a permanent 'Ceramic-Magnet' type which is release·d (by reversing the direction of
magnetic flux) when its electromagnet coil is energised.
THE BRAKE IS SELF-COMPENSATING FOR WEAR AND SHOULD REOUlRE NO
ADJUSTMENT DURING THE NORMAL USE AND LIFE OF THE MACHINE.
The associated power supply unit, which is mounted in the electrical cabinet and marked 2w1 is
designed to give a constant D .C. output, irrespective of mains supply fluctuations.
Each Unit is carefully 'trimmed' to suit the customers specified supply voltage before the machine
is despatched from our Works - should an adjustment be necessary the following procedure
should be complied with and only undertaken by a competent Electrician.
NOTE: Spacers (402.152) on the main spindle should allow for 1mm movement of armature at
initial setting (Fig. 1}._
(1 l Switch off mains supply at th� isolator, remove moulded end guard, depress and 'hold'
end guard interlock switch, op_en electrical cabinet door.
(2} Release potentiometer lock nut on brake power supply unit
(2wl)
and turn adjusting screw
anti-clockwise as far as it will go.
(3) Switch on mains supply at the isolator interlock part and press the brake release push button
at the control station.
Then, using a D. C. voltmeter ( 1 OOV scale) across terminals 25 and 26 (on 2w1) or at the
brake unit terminals, slowly turn the adjusting screw clockwise until the brake disengages and
note the D. C. voltage at this point.
(4) Further tum the adjusting screw until 6 volts have been added to the 'release' figure.
ON NEW INSTALLATIONS - AT THIS POINT SET 'AUTO GAP' ASS EMBLY AS IN Oil
(5) Switch off mains supply at the isolator interlock part, retighten the potentiometer lock nut,
close electrical cabinet, release end guard interlock switch and refit moulded end guard.
(6) Check for correct operation.
!Ill TO SET'AUTOGAP' ASSEMBLY (Fig.1)
With armature (D) in the disengage position and pulled fully away from the magnet (to give 1mm
air gap (E) all round the.periphery) - slide the detent spring retainer (A) on each drive pin (B)
until it bottoms against the carrier {C). Switch off mains supply - or cancel brake release when
setting will be complete (nominal working air gap is .79mm (lzin).
30
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Содержание M400
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