I.B. 17555C
Effective November 1999
Page 38
SECTION 6: MAINTENANCE AND STORAGE
6-1 GENERAL
The Digitrip 3000 Protective Relay is designed to be a
self contained and maintenance free unit. The printed cir-
cuit boards are calibrated and conformally coated at the
factory. They are intended for service by factory trained
personnel only. The Troubleshooting Guide (Table 6.1) is
intended for service personnel to identify whether a prob-
lem being observed is external or internal to the unit. If a
problem is identified to be internal, the unit should be
returned to the factory for repair or replacement as
described in Paragraph 6-3.
6-1.1 STORAGE
The Digitrip 3000 Protective Relay should be stored in an
environment that does not exceed the specified storage
temperature range of -40°C to +70°C. The environment
should also be free of excess humidity. There are no alu-
minum electrolytic capacitors used in the relay, therefore
it is not a requirement to power the unit occasionally. If
possible, the relay should be stored in its original packing
material and container.
6-2 TROUBLESHOOTING GUIDE (TABLE 6.1)
WARNING
ALL MAINTENANCE PROCEDURES MUST BE PER-
FORMED ONLY BY QUALIFIED PERSONNEL WHO
ARE FAMILIAR WITH THE DIGITRIP 3000 PROTEC-
TIVE RELAY, THE ASSOCIATED BREAKER AND
CURRENT LINES BEING MONITORED. FAILURE TO
OBSERVE THIS WARNING COULD RESULT IN SERI-
OUS INJURY, DEATH AND/OR EQUIPMENT DAMAGE.
TROUBLESHOOTING PROCEDURES MAY INVOLVE
WORKING IN EQUIPMENT AREAS WITH EXPOSED
LIVE PARTS WHERE THE HAZARD OF A FATAL
ELECTRIC SHOCK IS PRESENT. PERSONNEL MUST
EXERCISE EXTREME CAUTION TO AVOID INJURY
OR EVEN DEATH.
ALWAYS DISCONNECT AND LOCK OUT THE CUR-
RENT SOURCE AND CONTROL POWER SUPPLY
BEFORE TOUCHING THE COMPONENTS ON THE
REAR OF THE DIGITRIP 3000 PROTECTIVE RELAY.
6-3 REPLACEMENT
Follow these procedural steps to replace the Digitrip
3000 Protective Relay.
Step 1: Turn off control power at the main disconnect
or isolation switch of the control power sup-
ply. If the switch is not located in view from
the relay, lock it out to guard against other
personnel accidentally turning it on.
Step 2: Verify that all “foreign” power sources wired
to the relay are deenergized. These may also
be present on the alarm terminal block. Cur-
rent transformer inputs must be temporarily
shorted at a point prior to the relay’s termi-
nals before attempting to open these termi-
nals on the Digitrip 3000.
Step 3: Before disconnecting any wires from the unit,
make sure they are individually identified to
assure that reconnection can be correctly
performed. Make a sketch to help with the
task of terminal and wire identification.
Step 4: Remove wires by loosening or removing the
screw terminal where there is a wire connec-
tion.
Step 5: Remove the 6 mounting screws holding the
unit against the door or panel. These are
accessed from the rear of the relay.
CAUTION
SUPPORT THE PROTECTIVE RELAY FROM THE
FRONT SIDE WHEN THE SCREWS ARE LOOSENED
OR REMOVED. WITHOUT SUCH SUPPORT, THE PRO-
TECTIVE RELAY COULD FALL OR THE PANEL
COULD BE DAMAGED.
Step 6: Carefully lay the screws aside for later use.
Step 7: Mount the replacement unit. Read Paragraph
5-2.2 before attempting this.
Step 8: Reverse the procedure outlined in Steps 4
and 5.
Step 9: Using the sketch mentioned in Step 3,
replace each wire at the correct terminal. Be
sure that each is firmly tightened. Remove
temporary shorts on incoming current trans-
formers.
Step 10: Restore control power. Refer to Paragraph 5-
5.2 entitled “Initial Power Application.”
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