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Instructions for
VSR-Series Type 5HK
Vacuum Motor Starter
IB01301027E
IB01301027E
Page 20
Page 20
Page 20
Page 20
Page 20
Effective: May 2008
Effective: May 2008
Effective: May 2008
Effective: May 2008
Effective: May 2008
SECTION 6: INSPECTION AND MAINTENANCE
ALL WORK PERFORMED ON THIS STARTER SHOULD BE DONE
WITH THE MAIN DISCONNECT DEVICE OPEN AND LOCKED OUT.
AS WITH ANY STARTER OF THIS VOLTAGE, THERE IS DANGER
OF ELECTROCUTION AND/OR SEVERE BURNS. MAKE CERTAIN
THAT POWER IS OFF. CHECK FOR VOLTAGE WITH VOLTAGE
SENSOR OR A METER OF THE APPROPRIATE RANGE. MAKE
CERTAIN THAT ALL TRANSFORMERS ARE ISOLATED TO
PREVENT FEEDBACK AND THE RESULTANT GENERATION OF
HIGH VOLTAGE.
The starter should be serviced on a regular basis. The time interval
between maintenance checks is variable and dependant on factors
such as environment, duty cycle, etc. Unless the experience of the
maintenance personnel suggests a different service interval, the
contactor should go through a checkout after each 50,000
operations or annually, which ever occurs first.
6.1 GENERAL
The starter should be kept clean and free from dust and other
accumulated deposits. Dust can be removed from the starter by
wiping with a lint free cloth.
Inspect for loose joints that produce excess heat and discolor
conductors. Verify that insulation has not been damaged by high
temperatures. Do not over-torque bolts while verifying tightness.
Hardware is both Metric and US standard sizes. Refer to Table
6.1
for recommended torque values.
6.2 VACUUM INTEGRITY CHECK
THIS PROCEDURE REQUIRES THE USE OF A HIGH POTENTIAL
TEST UNIT WHICH PRODUCES HAZARDOUS VOLTAGES.
APPLYING HIGH VOLTAGES ACROSS THE OPEN CONTACTS
OF A VACUUM INTERRUPTER MAY PRODUCE X-RAYS. THE
RADIATION MAY INCREASE WITH AN INCREASE IN THE VOLT-
AGE OR A DECREASE IN THE DISTANCE BETWEEN THE OPEN
CONTACTS. THE LEVELS OF RADIATION GENERATED AT THE
RECOMMENDED TEST VOLTAGES AND NORMAL CONTACTOR
OPEN GAP SPACING ARE EXTREMELY LOW. HOWEVER, AS A
PRECAUTIONARY MEASURE IT IS RECOMMENDED THAT ALL
OPERATING PERSONNEL STAND AT LEAST THREE FEET AWAY
FROM THE CONTACTOR WHILE PERFORMING THIS TEST.
Vacuum starters depend on the vacuum in each interrupter to
successfully stop current flow to the connected load when the
starter opens.
WARNING
WARNING
WARNING
Starters are thoroughly tested at the factory prior to shipment. They
can, however, be damaged by improper handling during shipment
and storage. The integrity of the vacuum interrupters should
therefore be verified before the contactor is energized for the first
time. The check should also be made each time the contactor is
serviced or repaired, otherwise the test should be performed each
50,000 operations or annually, whichever occurs first.
To verify the integrity of the vacuum interrupters a voltage of
19kV-ac should be applied across the open contacts of the
interrupters. The voltage should be applied for 60 seconds without
breakdown. Breakdown is defined as a current of 5mA or more
flowing across the open contacts. Note that approximately 1mA of
current will flow through each interrupter during the AC test due to
the capacitance of the vacuum interrupter.
If a DC high potential test unit is used, make certain that the peak
voltage does not exceed 28kV, the peak of the corresponding AC
RMS test voltage. A megger cannot be used to verify vacuum
integrity due to its limited output voltage.
6.3 INTERRUPTING WEAR CHECK
The interrupters used in the starter are designed for long electrical
life. Replacement should be at 300,000 operations except in cases
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Table 6.1 - Recommended Torque Values*
Figure 6-1 Interrupter Wear Check
