BENDIX BW1664 Bedienungsanleitung

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1
®
SD-13-4793
DESCRIPTION
There are two Bendix antilock modulators available from
Bendix Commercial Vehicle Systems LLC, the older M-21
modulator and the newer M-22
modulator. Both are
functionally the same.
The M-21
and M-22
antilock system modulators (Figure
1) are essentially high capacity, on/off air valves that
incorporate a pair of electrical solenoids for control. The
solenoids provide the electro-pneumatic interface or link
between the antilock controller electronics and the air brake
system. The modulator can be used to control the braking
function on an individual wheel or two service actuators. When
used to control both service chambers on an axle or two
chambers on the same side of a tandem axle, the modulator
is sometimes mounted ahead of a quick release valve, which
provides quick exhaust of service applications during normal
braking. (Figure 2) In the case of individual wheel control
applications, the modulator is always the last control valve
through which air passes on its way to the service brake
actuator and a solenoid assembly which contains one
normally open solenoid (NOS), one normally closed solenoid
(NCS), and two inlet and exhaust diaphragm valves. A
Packard, three pin, 280 series weather resistant electrical
connector is an integral part of the modulator solenoid
assembly and serves to carry control commands from the
antilock controller to the modulator. Two, .35 inch diameter,
mounting holes are provided for frame or cross member
mounting. The single supply, delivery and exhaust port on
both modulators is identified with a cast, embossed numeral
for positive identification.
Bendix
®
M-21
and M-22
AntiLock Modulator Assembly
FIGURE 1 - M-21
AND M-22
MODULATOR
M-21
MODULATOR M-22
MODULATOR
SUPPLY
(CAST-IN ID #1)
SUPPLY
(CAST-IN ID #1)
DELIVERY
SUPPLY
MOUNTING
HOLES
DELIVERY
(CAST-IN ID #2)
SOLENOID
CONNECTOR
SUPPLY
DELIVERY
EXHAUST
(CAST-IN ID #3)
SOLENOID
CONNECTOR
MOUNTING
HOLES
DELIVERY
(CAST-IN ID #2)
EXHAUST
(CAST-IN ID #3)
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Inhaltsverzeichnis

Seite 1 - AntiLock Modulator Assembly

1®SD-13-4793DESCRIPTIONThere are two Bendix antilock modulators available fromBendix Commercial Vehicle Systems LLC, the older M-21™modulator and the

Seite 4 - ANTILOCK OPERATION

12BW1664 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 6/2004 Printed in U.S.A.

Seite 5 - ANTILOCK HOLD

2FIGURE 2 - WHEEL AND AXLE CONTROL SYSTEMSbwNON-ANTILOCK HOLD (FIGURE 4)When the desired air pressure is attained in the servicebrake chambers, the br

Seite 6 - OPERATION & LEAKAGE TESTS

3FIGURE 3 - M-21™, M-22™ MODULATOR NON-ANTILOCK APPLICATION OF SERVICE BRAKESBRAKE VALVESPRINGSUPPLYDIAPHRAGMSUPPLYSOLENOIDSPRINGEXHAUSTDIAPHRAGMEXHAU

Seite 7 - VALVE INSTALLATION

4NON-ANTILOCK EXHAUSTThe manner in which air exhausts through the modulatordiffers, depending upon how rapidly the brake application isreleased by the

Seite 8 - MODULATOR

5ANTILOCK EXHAUST (FIGURE 7)When wheel lock is detected, or imminent, the antilockcontroller simultaneously energizes both the supply andexhaust solen

Seite 9 - PERSONAL INJURY OR DEATH:

6ANTILOCK RE-APPLYIf the antilock controller senses that wheel speed hasincreased sufficiently to require reapplication of brakingpressure, it de-ener

Seite 10

7C. Apply a soap solution around each diaphragm cover.Leakage should not exceed a 1" bubble in less than 3seconds. If leakage exceeds the specifi

Seite 11

8FIGURE 8 - M-21™, M-22™ MODULATOR ANTILOCK APPLICATION HELD POSITIONBRAKE VALVESPRINGSUPPLYDIAPHRAGMFIGURE 9 - M-21™, M-22™ MODULATOR CONNECTOR VIEWM

Seite 12

9WARNING! PLEASE READ AND FOLLOWTHESE INSTRUCTIONS TO AVOIDPERSONAL INJURY OR DEATH:When working on or around a vehicle, the followinggeneral precaut

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