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SSC-SVN001H-EN
Fig. 08 - Belt Tension Adjustment
Fig. 07 - Belt Tension Meter
Unbalanced Voltage
An excessive unbalance between pha-
ses in a 3-phase system will lead to mo-
tor overheating and failures.
The maximum allowable unbalance is
2%. Voltage unbalance can be defined
as 100 times the maximum offset of the
three voltages (i.e. three phases) minus
the average (regardless of the sign), di-
vided by the average.
Example:
If the three voltages measured in a line
are 221 V, 230 V and 227 V, the avera-
ge 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 unba-
lance of 20%, leading to an increase in
motor winding temperature and reducing
motor life.
Maintenance
Procedures
Belt Tension Measurement
A tension meter such as the one
showed in Fig. 3 will be required to
measure the belt tension. The pro-
per deflection is determined by the
result of the division of the distan-
ce between sheaves by 64 (inches).
If a tension meter is not available,
press the belt with the thumb. The belt
should present a deflection of approx.
10 mm. If replacement for a new one
is required, set tension to the belts and
allow them to work for several hours un-
til they adapt to the sheave channels,
then set tension 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.
A 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 doesn’t damage
the fins.
CAUTION:
!
Do not crush the fins during
the cleaning process. This will
reduce the heat exchange.
Содержание CXPA 050
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