User`s manual

66
Magtrol WB/PB DynamometersChapter 4 – Connections / Configuration
4.2 TANDEM DYNAMOMETER CONFIGURATION
The tandem configuration combines the advantages of both the WB Eddy-current and PB magnetic
powder dynamometers by coupling them in series.
DYNAMOMETER / TSC1
AUX / TSC2
SUPPLY 2
SUPPLY 1
RS-232C
GPIB/IEEE–488
BRAKE
ACCESSORY
TORQUE–SPEED
OUTPUT
CTRL OUT
BRAKE FUSE
CAUTION: DOUBLE POLE FUSING
75VA 50/60Hz
EARTH
GROUND
FUSE (5×20mm):
120V UL/CSA 800mA 250V SB
240V IEC 315mA 250V T
(5×20mm):
UL/CSA 1.25A 250V SB
IEC 1A 250V T
MAGTROL, INC. BUFFALO, NY
GPIB
or
RS-232
PC
M-TEST
Clutch
(EK)
DSP6001
Dynamometer
Controller
Transformer
Powder Brake
Dynamometer (PB)
Excitation
Torque
DES Power Supply
TSC 401
Torque/Speed
Conditioner
Eddy-Current Brake
Dynamometer (WB)
Excitation
Torque
TSC 401
Torque-Speed
Conditioner
DES Power Supply
Speed
Figure 4–3 Tandem Configuration
In tandem, the unique features of each type of dynamometer brake are utilized, allowing nominal
braking torque to be applied to the unit under test from zero speed to maximum rotation. Each
dynamometer (WB and PB) can also autonomously operate according to its own characteristics.
Tandem Dynamometers are available on a number of PB/WB combinations. Refer to the corresponding
data sheets in Section 1.2 for speed and torque ratings of each tandem configuration.
Note: The parametrization of the tandem dynamometers is quite
complicated. In order to get the maximum torque and to be able to
use the system at its fullest capacity, a complete Magtrol measuring
chain (as illustrated in Figure 4–3) is required.
4.2.1 e
lectromAgnetic clutch
To couple both dynamometers together in a tandem configuration, a toothed electromagnetic clutch
is required. This clutch is delivered as standard with all Magtrol tandem dynamometers.
When the speed of the PB Dynamometer is at zero, the electromagnetic clutch is engaged. Conversely,
the clutch disengages when the PB Dynamometer has reached its maximum speed. This function
is automatic when a Magtrol DSP Controller is used. (See Note in Section 4.2.)