t e s t stand. When this fuse is blown-out the
g e n e r a l reaction is that the load dc ammeter
The interlock switch (fig. 12), located behind
(1) will not register amperes or the indicator
the access door of the high voltage compartment
lamps of the battery circuit selector (41) will
not light-up (blown-out lamp (bulb) could also
pere, 250-volt ac, push button switch. The
c a u s e this trouble, also, be sure to have the
s w i t c h is used to disconnect the input circuit
battery on-off switch (41-B) in the "ON" posi-
t o the varidrive assembly. When the access
t i o n and the safety clip (33-B) off the stop
door is opened the switch will cut-off the elec-
button (33-C) and turn the knob of the voltage
trical power preventing the varidrive assembly
selector switch (41-A) to the different voltage
from operating. (Drive running indicator lamp
indicated on the dial when checking the battery
(34) will go out indicating this.)
circuit selector (41) ). Another condition which
Warning: Before reaching into the high volt-
w i l l exist if the fuse is blown-out is that the
age compartment, turn the on-off input power
t e s t indicator lamp (30-A) will not light-up
toggle switch (fig. 11) to "OFF" position as
when used to test the units of a generator regu-
high voltage exists in the surrounding area
lator or generator control box.
o f this compartment.
72. Drive Reversing Switch
The 15-ampere buss fuse (fig. 12), located
The drive reversing switch (fig. 12), located
behind the access door of the high voltage com-
behind the access door of the high voltage com-
p a r t m e n t (fig. 6), provides protection when
partment (fig. 6), is a two-pole, double-throw,
short circuit or overload conditions exist in the
100-ampere, 500-volt ac, non-fusible knife
c i r c u i t r y within the test stand for the various
switch, used to change the rotation of the gen-
i n s t r u m e n t s and controls on the main control
erator or alternator undergoing test (by chang-
p a n e l (fig. 16). When this fuse is blown-out
ing the varidrive assembly rotation). The
the general reaction is that the current to the
s w i t c h is placed in either the upper or lower
entire instrument panel of the test stand is cut-
position to change the rotation of the unit being
o f f including the current to the drive control
tested. The upward position turns the varidrive
(33) preventing the test stand from operating
shaft to the left when facing the varidrive as-
completely.
s e m b l y and the downward position turns the
s h a f t to the right when facing the varidrive
assembly.
The rectifier compartment (fig. 16), located
in the center of the front panel is used to con-
tain a rectifier mounted on a mounting bracket
The three 100-ampere, 600-volt fuses (fig.
a n d base (fig. 69). The compartment is air
12), located behind the access door of the high
cooled by an electric blower to prevent the rec-
v o l t a g e compartment (fig. 6), are cartridge
tifier from overheating and damaging the plates
type fuses which provide protection when short
of the rectifier. It is important that the mount-
c i r c u i t or overload conditions exist in the ac
ing bracket and base holding the rectifier is po-
input circuit to the drive motor of the varidrive
sitioned in the compartment so that it receives
assembly or to the circuitry of the testing con-
t h e full flow of air.
trol units of the test stand.
through 89 refer to figure 15 except where otherwise
indicated.
The 8-ampere buss fuse (fig. 12), located
behind the access door of the high voltage com-
ceptacles (Designated as 53 GEN CON-
partment (fig. 6), is rated at 125-volt ac, and
TROL BOX 6 1)
provides protection when short circuit or over-
load conditions exist in the circuitry to the load
The 150-ampere generator control box re-
d c ammeter (1), the battery circuit selector
ceptacles (1), located on the upper section of
(41), and the test indicator circuit (30) of the
t h e receptacle panel (fig. 15) are numbered