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F
ocus 3 Trouble Shooting Guide
IM
PORTANT SAFEGUARDS
A
ll work on the drive should be performed by personnel familiar with it and its
a
pplication. Before performing any maintenance or troubleshooting, read the
in
structions and consult the system diagrams. Only minor adjustments should be
n
ecessary on initial start-up, depending on the application. In addition, some common
s
ense maintenance needs to be followed.
MAKE SURE THAT ALL POWER SOURCES HAVE BEEN DISCONNECTED BEFORE MAKING CONNECTIONS OR TOUCHING INTERNAL PARTS.
LETHAL VOLTAGES EXIST INSIDE THE CONTROL ANYTIME INPUT POWER IS APPLIED, EVEN IF THE DRIVE IS IN A STOP MODE. A TURNING
MOTOR GENERATES VOLTAGE IN THE DRIVE EVEN IF THE AC LINE IS DISCONNECTED. EXERCISE CAUTION WHEN MAKING ADJUSTMENTS
WITH THE CONTROL DRIVING A MOTOR. NEVER INSTALL OR REMOVE ANY PC BOARD WITH POWER APPLIED TO THE CONTROL
KEEP IT CLEAN:
KEEP IT COOL:
KEEP CONNECTIONS
TIGHT:
THE DC MOTOR MAY BE AT LINE VOLTAGE EVEN WHEN IT IS NOT INOPERATION. THEREFORE,
NEVER ATTEMPT TO INSPECT, TOUCH OR REMOVE ANY INTERNAL PART OF THE DC MOTOR
(SUCH AS THE BRUSHES) WITHOUT FIRST MAKING SURE THAT ALL AC POWER TO THE
CONTROL AS WELL AS THE DC POWER TO THE MOTOR HAS BEEN DISCONNECTED.
The motor should be inspected at regular intervals and the following checks must be
made:
A. See that both the inside and outside of the motor are not excessively dirty. This can
cause added motor heating, and therefore, can shorten motor life.
B. If a motor blower is used, make sure that the air passages are clean and the impeller
is free to rotate. If air filters are used, they should be cleaned at regular intervals or
replaced if they are disposable. Any reduction in cooling air will increase motor
heating.
C. Inspect the commutator and brushes. Replace the brushes if needed. Make sure that
the proper brush grade is used.
D. The motor bearing should be greased per the manufacturer's instructions as to type
of grease and maintenance frequency. Over greasing can cause excessive bearing
heating and failure. Consult the instructions supplied with the motor for more details.
Page 56
The control should be kept free of dust, dirt, oil, caustic
atmosphere and excessive moisture.
The control should be located away from machines having a
high ambient temperature. On panel mount controls, air flow
across heatsinks must not be restricted by other equipment
within the enclosure.
The equipment should be kept away from high vibration
areas that could loosen connections or cause chafing of
wires. All interconnections should be re-tightened at time of
initial start-up and at least every six months.
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