I .
I
SECTION II
1.
DESCRIPTION
of
CONTROLS and INSTRUMENTATION
A.
GENERAL DESCRIPTION
AVO International
Circuit Breaker Test Sets are portable high current units designed
for testing and adjusting low voltage circuit breakers and other current actuated
devices. The units incorporate a variable high current
ac
output, and uses the latest
in
Digital Signal Processing (DSP) technology
to
control the circuit breaker test sets
as
well as measure the reactions
of
the breaker under test. The units are self
protected against overloads and short circuits.
B.
CONTROLS AND INSTRUMENTATION
1) OUTPUT CONTROLS:
a) OUTPUT SELECTOR
Switch:
Adjustment
of
the output is accomplished by
the combination
of
the OUTPUT SELECTOR
Switch
and VERNIER CONTROL.
This is a multi-position switch which provides
coarse adjustment
of
the output. Position 1
provides minimum output. The last position
provides maximum output. The
OUTPUT
SELECTOR Switch
is interlocked with the
output initiating circuit. Depressing the switch
to change positions operates the interlock and
de-energizes the output.
b)
VERNIER
CONTROL Provides fine adjustment
of
the output
(Power
Stat): between steps
of
the OUTPUT SELECTOR
Switch.
2. Circuit Breaker:
3.
FUSE:
4. AUX.
OUTLET
Functions
as
the input
POWER
ON/OFF
Switch
and also provides short-circuit and
overload protection.
Protects control and isolation transformers
A ground fault protected
120-volt outlet is
provided
for
convenient connection
of
accessory equipment.
4
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