Computer-Assisted 0.2-kW Electromechanical Training System (8006)
This video demonstrates a procedure to be used only when the Prime Mover's speed display does not match the speed display of the LVDAC- or LVDAM-EMS software. Calibration is not recommended as a regular maintenance service.
Download 8960-10_calibration.wmv
8960-1x - Prime Mover / Dynamometer
Release date: 2008-08-27
Affected models: 8960-1x - Prime Mover / Dynamometer
Brief description of the problem:
Speed output signal inaccuracy at low speeds.
Full description of the problem:
When the 8960-1x is running counterclockwise at speeds between 0 and 600 rpm, the speed output signal does not vary accordingly to the nominal rate of 500 rpm / V.
How to fix:
To fix this problem, two resistors (R59 and R77) have to be replaced on the printed circuit board (30350 rev. 2) which is located beneath the motor. To know the new value of these resistors and where they are located on the printed circuit board, consult the table and figure below.
|
Identification |
current resistor value |
New resistor value |
|
R59 |
1.0MΩ 1/4W 5% |
22.0MΩ 1/4W 5% |
|
R77 |
10.0kΩ 1/4W 5% |
2.4kΩ 1/4W 5% |
Note:
This product fix is valid only for 8960-1x units that have the revision #2 of printed circuit board 30350. Before you undertake this modification, look at the upper left corner of the printed circuit board (beside Transformer T1) to make sure that your 8960 1x has the a revision. In the event that your 8960-1x has an older revision of printed circuit board 30350, contact us by Email at: services@labvolt.com.
Download PF1062.JPG
This video demonstrates the RPM modification procedure to the LVDAC-EMS software/9063 Data Acquisition when used with an 8960-10 Prime Mover.
Download lvdac_sw_mod.wmv
Synchronizing Module 8621-0x pilot lamps problem
Release Date: 2010-07-02
Affected Models: 8621-0x, Synchronizing Module
Problem encountered:
The pilot lamps of the Synchronizing Module do not light when the unit is used to synchronize an alternator to the power network.
Cause :
This problem is caused by diodes which are in series with the pilot lamps in the new versions of the Synchronizing Module, and also because the neutral connection of the alternator is missing in some exercises.
Solution :
The neutral point of the alternator must be connected to the neutral terminal of the Power Supply as shown in the following figure.
Note: All figures and exercices in the manuals have been updated to reflect the changes stated in this product fix