SSC-SVN001F-EN
13
Fig. 08 - Belt Tension Adjustment
Fig. 07 - Belt Tension Meter
Unbalanced Voltage
An excessive unbalance between phases in
a 3-phase system will lead to motor
overheating and eventual failures.
The maximum allowable unbalance is 2%.
Voltage unbalance can be defined as 100 ti-
mes the maximum offset of the three
voltages (i.e. three phases) minus the mean
(regardless the sign), divided by the mean.
Example:
If the three voltages measured in a line are
221 V, 230 V and 227 V, the average will be:
(
221 + 230 + 227)/3 = 226 volts
The unbalance percentage is:
100 x (226 - 221)/226 = 2.2%
This
result
indicates
the
presence
of an unbalance above the maximum
allowable
value
of
0.2%.
The
phase
unbalance can result in a current unbalance
of 20%, leading to an increase in motor
winding temperature and reducing motor
life.
Belt Tension Measurement
A tension meter such as the one showed in
Fig. 3 will be required to measure the belt
Maintenance
Procedures
tension.
The
proper
deflection
is
determined by the result of the division of
the distance between sheaves by 64 (in-
ches). If a tension meter is not available,
press the belt with the thumb. The belt
should
present
an
arrow
of
approx.
10 mm. If replacement for a new one is
required, stretch the belts and allow them to
work for several hours until they adapt to the
sheave channels, then stretch them again.
Liquid Sight Glass
When the sight glass displays bubbles, one
or more of the following problems may be
present:
a.
Lack of refrigerant.
b.
Clogged drier filter.
c.
Expansion valve is too open.
d.
Low subcooling.
e.
Presence of non-condensables.
The yellow color indicates the presence of
residual humidity in the refrigerant circuit.
During normal operation the sight glass
display should be green with no bubbles,
indicating that the refrigerant load in the
refrigeration circuit is correct and that the
refrigerant is dehydrated.
Condenser Coil
The condenser coil should be cleaned with
a soft brush and compressed air jets or low
pressure water jets in the opposite direction
of normal air flow. Move the hose vertically
and adjust the hose pressure so that it
cannot damage the fins.
CAUTION:
!
Do not crush the fins during the
cleaning process. This will impair
the heat exchange.
Содержание CXPA
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