SPACE s.r.l.
Soc.a socio unico
PFB035 SERIES – PFB040 SERIES
PFB045 SERIES – PFB060 SERIES
SPRT102/4 SERIES – SPRT102/5 SERIES
SPRT102/6 SERIES – SPRT102/7 SERIES
Code M0247 - Ver.1.4
(09/2016)
SPACE s.r.l. – 10090 TRANA (TO) Via Sangano, 48
Tel. (+39) 011/ 934 40 300 – Fax (+39) 011/ 933 88 64
e-mail: info@spacetest.it - www.spacetest.com
3.1. Roller assembly
The roller assemblies of the SPACE brake tester consist of a folded metal (plate) frame with
reinforcements and “C” sections for supporting and housing the operation and measurement
devices.
The roller drive system consists of a gear motor (one for each pair of rollers) constrained to a load
cell secured to the frame.
During braking, a tangential force is applied on the rollers which creates a torque resistant to the
action of the gear motor. In these conditions, the gear motor would tend to turn around the roller
rotation axis if it were not secured to the load cell.
In actual fact, the resistant torque generated by braking is unloaded on the cell.
The load cell sends a signal to the console which is used to manage result calculation and display.
Each pair of rollers features a proximity switch (called CAR-ON sensor) which indicates the
presence of a vehicle. If the support on which this is mounted is lowered, the sensor no longer
detects the support, the contact closes and an electric signal is sent to the console; this is the
signal for the motors to start.
In the event of even only one of the proximity switches not closing the contact, the console fails to
receive the signal and consequently the test is interrupted. It follows that testing is only possible
with both “rollers” lowered by the axle of the vehicle being tested.
Each pair of rollers also features a proximity switch (called TACHO sensor) that detects roller
speed and consequently vehicle wheel speed. This quantity, which is continuously measured,
when compared with the initial wheel speed, determines the slip condition that causes test stop.
Roller stoppage at the end of the test is therefore determined by the set slide threshold having
been reached. This normally coincides with detection of maximum braking force of the axle being
measured.
In the case of emergencies or special needs, the test can also be stopped by the operator, by the
remote control or keyboard.
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