Paragraphs 4-1 to 4-10
TM 11-6625-680-15
OPERATING INSTRUCTIONS
cuits, down end OFF for inverters not requiring `heat
in control circuits. (Refer to paragraphs 1-16 and
4-2. Verify mechanical zero setting of each meter
(excluding frequency meter) and adjust if necessary.
3. A.C. PHASE switch (18) at 10 for single-
Verify frequency meter at center-set, of 400 cycles
phase inverter, 30 for 3-phase inverter.
"per second, and adjust if required to the center-set
4. A.C. PHASE selector (19) at 1.
position. (Refer to paragraph 7-6.)
5. A.C. AMP RANGE selector (21) at 50.
6. D.C. AMP RANGE rotary shunt switch se-
lector (12) at START.
7. LOAD CONTROL autotransformer selector
(17) at 0%.
c. Plug the large connector of the cable assembly
into the tester connector (22).
Ensure correct cable assembly selection
as three-phase inverters can be tested on
delta output only. Cable assemblies are
identified by numbered strips encircling
Note
the cables near the large connector.
All tests are conducted at tester settings
Failure to use correct cable assembly
and indications as instructed in the handbook
can result in damage to equipment.
pertaining to the specific inverter-under-
4-4. Determine number and rated output of inverter-
test.
under-test (whether single-phase or three-phase) and
select cable assembly designated in figure 4-1.
4-8. Place the D.C. PWR switch (figure 1-3, 12A) at
Verify selection of proper cable assembly by match-
ON, energizing the tester and the inverter-under-test.
ing the number and type of terminals of the cable as-
The green 28V. ON indicator light (1) should illumi-
sembly to those on the inverter. If the inverter to be
nate and the inverter immediately start.
tested is not listed in figure 4-1, determine rated
output of inverter, then select the cable assembly
from list that meets single-phase or three-phase
delta output requirement and matches connection
points of the inverter. (Refer to inverter handbook
Do not touch rear of cabinet during test
of instruction.)
operation. Do not place any equipment on
or near rear of cabinet during test opera-
tion. Failure to observe this warning can
result in severe burn to personnel or fire
TO prevent cable damage by heat gener-
hazard to equipment.
ated during test, remove all unused cable
assemblies from recessed storage space
4-9. Observe the A.C. VOLTS meter (4) and the
in cabinet top.
FREQUENCY meter (6) for correct no-load indica-
tions.
UNDER-TEST.
4-10. Rotate the D,C. AMP RANGE rotary shunt
switch selector (12) and the A. C. AMP RANGE selec-
tor (21) to placarded settings one higher than current
forming the following procedure:
flow requirements of the inverter. Place LOAD
a. Secure the selected cable assembly to the in-
switch (13) to ON.
verter as detailed in the inverter handbook. Verify
inverter requirements for maintaining current to
Note
provide heat in control circuits.
With LOAD CONTROL autotransformer
b. Ensure switches and controls are positioned as
selector at 0% and A.C. AMP RANGE
follows:
1. D.C. PWR switch (figure 1-3. 12A) at OFF.
selector at 1 the A.C. AMPS meter will
indicate approximately 0.2 AMP (auto-
2. LIVE CIRCUIT switch (16) positioned up and
energized for inverters requiring heat in control cir-
transformer excitation current).
