Operating Procedures

TM 11-6130-377-14

3-2. Operating Procedures

circuit is removed, at which time operation returns to

normal.

This section contains the procedures required for starting

b. Parallel Operation. If a load greater than 50

and stopping the inverter in its various modes of operation

amperes (5 KVA) is anticipated, two inverters are to be

(paga 1-9).

connected in parallel to provide the necessary power. A

3-3. Equipment Starting Procedures

Master/Slave cable assembly is provided to connect the

two units in parallel as shown in detail "B" of figure 2-2. In

Prior to performing the following turn-on procedure,

this mode of operation the inverter to which the MASTER

ensure that both DC and AC circuit breakers are set to

plug of the cable assembly is connected becomes the

OFF. Refer to paragraph 3-6 for the sequence of

controlling or master inverter and the unit which receives

operation to be followed in the event a circuit breaker trips

the SLAVE plug becomes the slave inverter. The 100

at turn-on.

amp circuit breaker (user furnished) should be placed in

a. Single Inverter Starting Procedure.

Refer to

the AC OUT lead as shown in B, figure 2-2, for best

paragraph 2-4 for electrical installation of a single inverter

operation.

in the system, and figure 3-1 for location of controls and

c. Operating Time. When there are two inverters, it

indicators.

is recommended that they be used alternately to

NOTE

accumulate equal operating times (as counted on the

Perform the Following in sequence

ELAPSED TIME meter); e.g., operate each inverter on

given.

alternate days.

(1) Position DC circuit breaker to ON. Amber

3-5. Stopping Procedure

DC ON indicator lamp lights. Within 5 seconds the

Perform the following stopping procedures in the

cooling fans should be operating.

sequence given.

(2) Position AC circuit breaker to ON. Green

a. Non-Parallel Operation

AC ON indicator lamp lights.

(1) Position AC circuit breaker to OFF

b. Parallel Inverter Starting Procedure. Refer to

(2) Position DC circuit breaker to OFF; the

paragraph 2-4 for electrical installation of two inverters in

cooling fans stop operating.

parallel in a system, and figure 3-1 for location of controls

b. Parallel Operation

and indicators.

(1) Position the external 100 amp circuit

NOTE

breaker to OFF.

Perform the following in sequence given.

(2) Position both AC circuit breakers to OFF.

(1) Position the DC circuit breaker of the

NOTE

master inverter to ON. Amber DC ON indicator lamp

When the DC circuit breaker on the

lights. Within 5 seconds the cooling fans should be

master inverter is placed in the OFF

operating.

position, the DC circuit breaker of the

(2) Position the DC circuit breaker of the slave

slave inverter automatically trips off.

inverter to ON. Amber DC ON indicator lamp lights.

(3) Position the DC circuit breaker on the

Within 5 seconds the cooling fans should be operating.

master inverter to OFF and observe that the DC circuit

(3) Position the AC circuit breaker of the

breaker on the slave inverter trips off automatically and

master inverter to ON. Green AC ON indicator lamp

the cooling fans stop operating.

lights.

(4) Position the AC circuit breaker of the slave

3-6. Operation Under Abnormal Conditions

inverter to ON. Green AC ON indicator lamp lights.

Abnormal conditions which could affect the system

(5) Position the user-furnished external 100

include progressive and prolonged output overload,

ampere circuit breaker to ON.

overvoltage of the input voltage source above the

3-4. Equipment Operating Conditions

maximum specified, and undervoltage of the input

voltage source below the minimum specified.

a. Non-parallel Operation. During normal operation,

a. Progressive and prolonged output overloads

the DC VOLTAGE meter should indicate 104 to 141 vdc

cause the AC circuit breaker to trip. After the overload is

and the DC CURRENT meter should indicate up to 60

removed and the AC circuit breaker is reset by positioning

amp maximum. The AC VOLTAGE meter should indicate

to OFF and then to ON, normal operation can continue.

120 vac and the AC CURRENT meter should indicate 42

b. Overvoltage or undervoltage at the input causes

amp maximum (5000 VA). Because of the current-

the DC circuit breaker to trip. After the input voltage

limiting feature, a temporary short-circuit across the

condition is corrected, the inverter is reactivated by

output only causes the voltage to collapse until the short-

following the turn-on sequence given in paragraph 3-3.

3-3