Tri Tool 765RVC Hyrdaulic Power Supply - Manual (Page 19)

19
Model 765 RVC Hydraulic Power Supply
92-0306 : Rev. 140715
Set the ‘Start/Stop’ switch in the ‘Stop’ position.
The meter should show an ‘Open’ circuit.
Connect the meter to pins ‘C’ and ‘D’.
The meter should show a ‘Closed’ circuit.
VERIFY THE VOLUME CONTROL FUNCTIONS
These checks must be made using an Ohm meter.
Resistance reading given below are nominal, all resistances are + 10%.
Connect the meter to pins E and F.
The resistance reading should be 100 Ohms.
Connect the meter to pins ‘G’ and ‘H’.
Set the ‘Fwd/Off/Rev’ to ‘Off’.
The resistance reading should show an ‘Open’ circuit (infinite resistance).
Set the ‘Fwd/Off/Rev’ switch to ‘Fwd’.
The resistance reading will vary from 220 to 320 Ohms as the ‘Volume
Control’ dial is rotated from ‘Zero’ to ‘Full Flow’.
Hold the ‘Fwd/Off/Rev’ switch in ‘Rev’.
The resistance reading will vary from 265 to 365 Ohms as the Volume Control
dial is rotated from ‘Zero’ to ‘Full Flow’.
The preceding will show if there is a fault in the Pendant and isolate the fault to a
specific circuit.
To correct a fault it will require disassembly of the pendant to access the
wiring, switches and/or controls.
Use a additional meter checks and the Pendant Schematic to further isolate
the fault between the appropriate wiring, switch and/or control in the faulty
circuit.