OPERATING INSTRUCTIONS - TM-9-6625-2803-14-P0011

TM 9-6625-2803-14&P

6.0

OPERATING INSTRUCTIONS

6.1

TEST SET - This instrument measures complete line and

load conditions of a single and polyphase system.

Indications

will be correct for any current unbalance, provided the poly-

phase voltages are balanced.

6.2

ROTATION - Phase rotation A-B-C is assumed and must be

correct for proper indication.

If phase rotation is reversed,

the Var Meter will indicate up scale when the switch is set to

lead and the load has a lagging power factor such as an unloaded

induction motor. To correct the phase rotation, it is necessary

to interchange any two leads of a polyphase system.

6.3

PRECAUTIONS

6.3.1 NEVER connect this Test Set to a direct

current source.

6.3.2

Always set switches to Off (see below),

before applying power.

6.3.3 Always connect load leads to the same current

range on all three phases of the Test Set and to

a high enough range such that the full scale

value of the Ammeter will not be exceeded.

6.4

SWITCHES

6.4.1

VOLTMETER - The Voltmeter is supplied with two

switches, one for connecting the meter across the

various lines, and the second for range selection.

6.4.2

WATT/VAR METER - The Watt/Var Meter is supplied

with two switches,one for selecting single phase

watts, three phase watts or Vars, and the second

for voltage range. This switch must be set to

the same line to line voltage as the Voltmeter.

6.4.3

FREQUENCY METER - The Frequency Meter is provided

with a switch for selecting a frequency range of

45-55, 55-65 and 375-425Hz. The correct voltage

to operate the Frequency Meter is provided by

the Voltmeter circuit, when the Voltmeter reads

above mid scale.