Air Cooling; Figure 3-9 Air Flow Sensor Schematic - Magtrol HD-106 User Manual

Magtrol Hysteresis Dynamometers
3.3.3 a C
ir ooling
Magtrol's HD-510/515/710/715, ED-715 and any 800 Series Dynamometer are all internally ported
for compressed air or blower cooling and may be integrated with a manual or PC-based test setup
in order to provide air cooling of the dynamometer brake. An air flow sensor has been added to
these dynamometers to protect against operator error. With the air flow sensor, the dynamometer
comes equipped with a pressure sensor ported into the cooling airway. The sensor, when used in
combination with Magtrol's DSP7000 Dynamometer Controller, prevents the dynamometer brake
from being energized until the blower or air supply has been turned on.
When the air supply to the dynamometer is turned on, the pressure sensor closes an electrical contact.
Two wires from the sensor run internally to the dynamometer and attach to the torque amplification
board. One of the wires from the sensor is then passed directly to the back panel connector (14-pin
connector, pin 1). The other wire is tied on the board to +5 VDC COM (14-pin connector, pin 8).
When used with the DSP7000, pin 1 is internally pulled high with a resistance to 5 volts. If not using
a Magtrol controller, it is assumed the user will pull pin 1 to the 5 volts supplied to the amplifier
board (pin 7) with a 1 K to 10 K resistor.
PRESSURE
SWITCH
J4
1
2
+5 VDC
COM
TORQUE AMPLIFICATION BOARD
Figure 3–9 Air Flow Sensor Schematic
33
Chapter 3 – Installation/Configuration
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
BACK
PANEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14