GENERAL. Following repair of the test stand, perform the test and inspection procedures of this chapter to verify
that all malfunctions have been corrected. The test stand must satisfy all test and inspection requirements before it is
returned to service.
Drive Control Circuit, Varidrive, and Blower Motor.
Set the test stand controls to the preliminary settings listed in table 2-2.
Set circuit breaker switch (CB1, fig 2-8) to the ON position. Check to see that AC POWER ON indicator
(DS2) lights (fig 2-7).
Set work light switch (S5, fig 2-4) to the ON position and check to see that work light (DS3) lights.
Press START switch (S3, fig 2-7) and hold it in the depressed position momentarily. Release the START
switch. Check to see that DRIVE ON indicator (DS1) is lighted, the blower motor is operating, and the varidrive is
Adjust the SPEED CONTROL and verify that the varidrive speed can be adjusted smoothly. Check to see
that TACHOMETER RPM meter (M1, fig 2-4) indicates the correct varidrive speed (as checked with the handheld
tachometer) with TACHOMETER RPM SELECT switch (S36) set to the DIRECT DRIVE position. Set TACHOMETER
RPM SELECT switch (S36) to the CAL PULLEY position and verify that indication on TACHOMETER RPM meter M1
varies as TACHOMETER RPM PULLEY CALIBRATION control (R35) is varied.
Press STOP switch (S2, fig 2-7). Set circuit breaker switch (CB1) to the OFF position. Set drive reversing
switch (S1) to its opposite setting. Set circuit breaker switch (CB1) to the ON position.
Repeat step (4). The varidrive should rotate in the opposite direction.
Press STOP switch (S2). Set circuit breaker switch (CB1) to the OFF position.
Regulator Fixed Resistance Check Circuits (fig 2-5).