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Magtrol Hysteresis Dynamometers
Chapter 8 – Troubleshooting
MAINTENANCE
If the reading is within ±10% of the value specified in the table, proceed to
Section 8.1.3.2 – Current
Check
. If the reading is not within the values specified, contact Magtrol Technical Assistance.
Note:
The resistance check in the table is accurate for Magtrol HD-
106, -100, -400, -500 and -700 Series, ED-715 and HD-825
Dynamometers. The HD-800, 805, 810 and 815 Dynamometers
have circuitry between the connector and the brake coil. The brake
coil must be isolated from this circuitry for the resistance in the
table to be accurate.
8.1.3.2
Current Check
1. Insert an ammeter between the power supply and dynamometer brake.
2. Adjust the power supply voltage until the ammeter reading is equal to the value in the
following table.
Dynamometer
Model
F.S. Current
A
HD-106
0.145
HD-100
0.135
HD-400
0.300
HD-500
0.298
HD-510
0.298
HD-505
0.596
HD-515
0.596
HD-700
0.339
HD-710
0.339
HD-705
0.678
HD-715
0.678
HD-800
1.200
HD-810
1.200
HD-805
2.400
HD-815
2.400
HD-825
4.800
ED-715
0.678
ED-815
2.400
3. Attach the appropriate weight for full-scale torque and verify whether the brake holds the
load. If it does not hold the load with proper current flowing in the brake, the power supply
is not the problem. The dynamometer is probably at fault and you will need to contact
Magtrol Technical Assistance for further help.
Note:
The current check is accurate for all Magtrol Dynamometers.