Dynamometer Power Supplies

5241 POWER AMPLIFIER
(REQUIRED for HD-825 Dynamometers)

The Model 5241 is a voltage-controlled power amplifier designed exclusively for Magtrol’s Model HD-825 Hysteresis Dynamometer. Because of its double braking system, the HD-825 requires more than 4 amps of power in order to reach full torque. The 5241 (which can provide up to 5 amps of output current) is necessary in order to amplify the power between a 6200 or DSP7000 Controller (which both have a maximum current output of 1 amp) and the HD-825 Dynamometer.

 

Specifications.

ELECTRICAL CHARACTERISTICS
Current Output 0 to 5 A DC
Control Input 0 to +3 V DC    or    0 to -10 V DC
Fuses (5×20 mm)
Brake:

Power (120 V):
Power (240 V):

UL/CSA
IEC
UL/CSA
IEC
6.3 A
5 A
3 A
1.25 A
125 V
250 V
250 V
250 V
SB
T
SB
T
Power Requirements 330 VA
Voltage Requirements 120/240 V  60/50 Hz

 

 

 

 

DES 410/411

DES 410/411 POWER SUPPLY
(For Eddy-Current and Powder Brake Dynamometers)
DES 410 and DES 411 Power Supplies are specially designed
for the full range of Magtrol’s Eddy-current and Powder brake dynamometers with the design goal providing the best response time. The DES 410 / DES 411 supplies are packaged in an industrial housing made of cast aluminum. This offers superior protection against radiated emissions in order to avoid any disruption of the surrounding electronics modules. This housing must be installed directly on the test bench, next to the brake, as close as possible.
The DES 410 / DES 411 supplies can be controlled by digital signals and analog set point coming from peripheral electronics. The DSP7000 Dynamometer Controller has been designed to work with the DES 41x.
Control
The Power supply can be switched ON by remote control. The Stand-by signal enables the output current to be delivered. This excitation current is controlled by a set-point in the 0-10VDC range. The nominal value of the excitation current is set by internal resistors. There are two discrete outputs for alarms (open collector). The first is the “Temperature Alarm”. It will indicate if the cooling water of the Dynamometer or the inner temperature of the DES 41x are out of limits. The second is the « Electrical Alarm”. It occurs when an over current or a short circuit is detected. The output current is immediately turned OFF and latched while the General Alarm Relay is set under its Alarm position. A low state for 200 ms of the Stand-by signal resets the latch.

For applications with tandem dynanometers, the DES 410/DES 411 units also control the power supply of the electromagnetic clutch.

Supply Voltage
The main supply voltage of the DES 410/DES 411 is in the 115/230VAC/50/60Hz range. No selection is required. The DES 410 power supply features a galvanic insulation between the main circuit and the dynamometer power.

The DES 411 does not have galvanic separation. For safety reasons, the DES 41x case has to be grounded and the use of a ground fault current circuit breaker is recommended.

Features

  • For use with Magtrol WB Eddy-Current and PB Powder Brake Dynamometers
  • Controlled current supply, with over voltage factor > 5
  • Analog input for current set-point
  • Selection of nominal current
  • Control by digital inputs/outputs
  • General alarm provided by relay
  • 2 alarm outputs (temperature, electrical circuit)
  • Available in either 115 or 230 VAC

 

Technical Specifications

 

DES 410 DES 411
NETWORK SUPPLY
Voltage 115 VAC / 230 VAC ±10 %
Frequency 50 Hz / 60 Hz
Fuse T1A or T2A
depending on the brake(s)
115–230 VAC
T2A to T12A
depending on the brake(s)
230 VAC    115 VAC
Maximum current 1 A + clutch 3 A + clutch / 230 VAC
6 A + clutch / 115 VAC
ELECTROMAGNETIC CLUTCH SUPPLY
Voltage 115 VAC / 230 VAC
Current 1 A
SUPPLY FOR EXTERNAL USE
Voltage +24 VDC ±5 %
Maximum Current 300 mA
SELECTION OF NOMINAL CURRENT
(Selected by resistors) 0.5 A; 1.0 A; 1.5 A; 2.0 A; 2.5 A; 3.0 A 2.5 A; 4.0 A; 5.0 A; 7.5 A; 10.0 A; 12.0 A
EXCITATION SET-POINT
Voltage 0 to 10 VDC
Impedance > 50 kOhm
DIGITAL INPUTS (Galvanically Insulated )
Remote Control of the Network Input (PSC) Relay coil by +24 VDC / 30 mA
Control of the Electromagnetic Clutch Optocoupler activated by +24 VDC / 2.5 mA
Stand-by (enable) Optocoupler activated by either +24 VDC or +12VDC / 2.5 mA max
DIGITAL OUTPUTS (Galvanically Insulated )
Temperature Alarms 2 open collector outputs
Umax = 40 V, Imax = 3 mA
Electrical Alarm
GENERAL ALARM
Relay Contact 2 A / 30 VDC
ENVIRONMENTAL CHARACTERISTICS
Operating Temperature 0°C to +50°C
Storage Temperature -20°C to +70°C
Humidity 0 to 90% as per DIN 40040
Protection Class IP 66
Assembly cautionThe housing must be electrically and thermally coupled to the metal frame of the test bench to allow heat dissipation.
MECHANICAL CHARACTERISTICS
Housing Extruded cast aluminium
Weight (without cable) 5.2 kg; 11.5 lb
Weight (with integrated cable) 6.2 kg; 13.7 lb