Hobart 5359D Operation And Maintenance Manual page 40

OM 2012
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Generator
control ira)
Pr ate c t ive
rclaF
tra)
Control Box
Figure 8
(b) Generator output monitors (meters)
The generator output is monitored by three instruments; a frequency meter
(lO),a voltmeter (9), and an ammeter (7). The frequency meter is a
resonant-reed type,, and indicates the frequency of th- generator output
alternating current in the rcnge of 380 to 420 Hz (cycles per second). The
voitmeter indicates the' geflerator output voltage in. each phase-to-neutral
(A-N, B-N and C-N) or phase-to-phase (A-B, B-C and C-A) as selected
by the meter se!ector switch
(6) and the line selector switch (5). (These
switches will be described below.) The voltmeter has a 3-l/!-inch face '
and the scale is graduated 0 to 300 V. The ammeter is also 3-l/2-inch
size ond is graduated 0 to 500 A. The amperage value in each of the
three phases may be read on the ammeter by sefecting the desired phase
with switch (6). Three ammeter current transformers (Ref. 4, Fig. 13)
lower the output load current to a lesser value, of definite ratio, which
will operate the ammeter movement without damage. The ammeter dial
scale is graduated and numbered so that the pointer will indicate the true
load current value rather than the meter movement current.
(c) Meter and line switches
l-1
Page 16
These ,witches provide a means of selecting and determining which phase
of voltage and current is indicated on the voltmeter and ammeter and
whether the voltage is line-to-neutral or line-to-line. The meter switch
(6) is a four-position, rotary type. A namep!ate (4), located under the
switch knob,, is marked and lettered to indicate the three functional
positions of the meter switch. (When the knob is pointing straight down,
the switch is OFF.) The line switch (5) is a two-position, toggle switch
used to select either line-to-neutral or line-to-line voltage to the volt-
meter. The nameplate is also marked to indicate the position of this
switch.
Aug 25,&5