Dynojet Spring Applied Air Release (SAAR) Brake Assembly - Manual (Page 24)

Spring Applied Air Release (SAAR) Brake Assembly Installation
S P R I N G A P P L I E D A I R R E L E A S E ( S A A R ) B R A K E A S S E M B L Y I N S T A L L A T I O N
Four Wheel Drive Dynos
20
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FOUR WHEEL DRIVE DYNOS
The instructions in the following sections describe the differences for installing the
SAAR Brake Assembly on four-wheel drive dynos. The SAAR Brake Assembly may be
used to upgrade the braking on 224-248 model and 224-224 four-wheel drive dynos.
The 224-248 dyno has a stationary 248 dyno and a moveable 224 dyno. When
upgrading this model, you will leave the existing air applied brake on the stationary
248 dyno and only upgrade the moveable 224 dyno.
The model 224-224 dyno uses a stationary 224 dyno along with a moveable 224 dyno
that can be positioned to accommodate for the wheelbase of the vehicle being
tested.When upgrading a model 224-224, both 224 dynos must have the SAAR Brake
Assembly upgrade. To upgrade the stationary dyno, follow the directions in the
previous sections of the manual.
U PGRADING THE M OVEABLE 224 D YNO
Moveable 224 dynos use a control box containing the dyno movement board and
other movement components. The wiring to the brake solenoid is connected to the
movement board in the control box and not the breakout board, as in the standard
installation instructions.
In general, when installing a SAAR brake on a moveable 224 dyno, follow the
instructions in the manual, except when disconnecting and connecting the brake
control wiring and air. Use the steps that follow to connect the brake wiring to the
movement board and to connect the air supply to the SAAR brake.
C ONNECTING THE M OVEMENT B OARD AND S HOP A IR
The movement board is located inside the control box as shown in Figure 22.
1
Disconnect one black wire and one white wire from the movement board
terminals labelled BRK2 that connect the existing brake solenoid.
2 Route the wires for the new brake solenoid through the opening in the control
box and connect the two black wires to the terminals labelled BRK 2 on the
movement board. (Connect one to each terminal, the order does not matter as
the solenoid will operate correctly with either polarity.)
3 Connect the air hose to the solenoid, replacing the hose if necessary.
4 Continue the installation with step #2, “Connecting to the Shop Air” on page 18.