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Compressor Starting Procedures; Compressor Normal Operation Mode - Viking VCSB483D Service Notebook

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TERMINAL BOARD
The electrical diagram in figure 1 represents
the most typical connections with the use of
a terminal board
.
FIG. 1
STARTING PROCEDURES
Once all due electrical connections are made
and the compressor is properly assembled to
the refrigeration system, the compressor will
start if AC voltage is supplied to the
inverter. The following steps take part
during the start procedure:
a) After the connection to the supply
AC line (or switch on of thermostat)
the inverter will spend 6 seconds of
waiting time for the first try. The
inverter will also stand by for 6
seconds after each failed attempt (if
any).
b) After the 6 seconds delay, the
inverter will position the rotor.
c) Immediately after positioning the
rotor, the compressor will start and
accelerate to the pre-selected speed
entering the normal operation mode.
d) In the occurance of a failed start, a
limit of 12 consecutive tries will be
made until the inverter will assume a
waiting condition depending on the
software
situation may be encountered if there
is no equalized pressure between
suction and discharge sides in the
refrigerating system). The inverter
will also assume a waiting condition
if hardware defects are detected
before the first try.
e) If power is switched off during the
starting procedure, the inverter will
self reset when the power is
recovered.
f) A "watch dog" routine running at all
times will reset the inverter in case
strong
disturbance occurs.
NORMAL OPERATION MODE
After a normal starting, the compressor will
run under the desired speed dictated by the
speed control signal input.
During this phase, the compressor speed will
be monitored for each shaft turn and
compared with the speed control signal
information. If the compression load is too
high for the selected speed, the compressor
motor will be adjusted to work under a
lower speed until the compressor is able to
maintain a constant speed. If the load is too
high
so
the
maintained at the lowest possible speed,
then the compressor will be stopped.
At all times, a "watch dog" routine will reset
the inverter in case it stops working
properly. If power is switched off during
the operation, the inverter will self reset
when the power is recovered and begin a
new starting procedure.
35
version
installed
line
or
control
compressor
cannot
(this
signal
be

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