ABB CIRCUIT SHIELD 49/50 Manuale di istruzioni - Pagina 11
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Motor Overcurrent Relay
TESTING
1. MAINTENANCE AND RENEWAL PARTS
m
7.2.1.7-4
Page 11
No routine maintenance is required on the Type 49/50/51 relays. Follow test instructions to verify that the relay is in proper
working order. We recommend that an inoperative relay be returned to the factory for repair; however, a schematic
diagram will be provided on request. Renewal parts will be quoted by the factory on request.
214 Series Units
Drawout circuit boards of the same catalog number are interchangeable. Also units with catalog numbers of the form
214xxxx2 may replace units with catalog numbers the same except of the form 214xxxxl (hand-reset units), where all digits
except the last are identical. Similarly, units of the form 214xxxx3 may replace units of the form 214xxxx0 (self-reset units).
A unit is identified by the catalog number stamped on the front panel and the serial number stamped on the bottom side of the
drawout circuit board.
The board is removed by using the metal pull knobs on the front panel. Removing the board in service does not open circuit
the
CT'
s; however, in applications using the normally closed contact, a trip
will
result.
An 18 point extender board (cat 200X0018) is available for use in troubleshooting.
414 Series Units
Metal handles provide leverage to withdraw the relay assembly from the case. Removing the unit in an application that
uses the normally closed contact will cause a trip. The assembly is identified by a catalog number stamped on the
front of the unit and a serial number stamped on the bottom of the board.
Test connections are readily made to the Drawout relay unit by means of standard banana plugs. Current connections are
made to the vertical posts at the blade assemblies.
Control power and output connections are made at the rear
vertical circuit board. This rear board is marked for easier identification of the connection points.
Should separation of the upper and lower circuit boards be needed, remove (2) screws that attach the left and right handle
assemblies to the upper printed circuit board. The lower board may then be withdrawn forward from the printed circuit
connector.
An 18 point extender board (cat. 200X0018) is available from the factory if access to the lower circuit board is
required for troubleshooting.
A test plug
assembly,
catalog 400X0001 is available for use with the 414 series units. This device plugs into the relay
case on the switchboard and allows
access
to all external circuits wired to the case. See Instruction Book
m
7.7.1.7-8 for
details on the use of this device.
2. HIGH POTENTIAL TESTS
High potential tests are not recommended. A hi-pot test was performed at the factory before
shipping.
If
a
control wiring
insulation test is required, partially withdraw the relay unit from the case sufficient to break the rear connections before
applying the test
voltage.
3. BUILT-IN TEST FEATURE
Tests should be made with the main circuit de-energized.
A built-in trip test feature is provided as
a
convenient means of testing the operation of the relay
and
the
associated
trip
circuit.
Be sure
to record or
mark
the
relay
settings
before
proceeding,
so you can easily
return
to the proper settings at
the end of the procedure.
To check the FAULT (50) function, set the Fault dial
at
4
multiples.
Press the TRIP test
button.
The relay should trip
instantaneously and display the (50) target.