EntelliGuard®TU Trip Unit
09/25/08 Section 3 – Operation
© 2008 General Electric All Rights Reserved 19
SECTION 3 – OPERATION
WARNING
IMPROPER INSTALLATION, OPERATION AND
MAINTENANCE
Ensure only qualified personnel install, operate,
service and maintain all electrical equipment.
Failure to comply with these instructions could
result in death or serious injury.
WARNING
PERSONAL INJURY
• Avoid risk of injury from moving parts while
handling the circuit breaker.
• If advisable, use a cable/busbar lockable
grounding device (optional accessory) to provide
additional safety during system maintenance.
Failure to comply with these instructions could
result in death or serious injury.
CAUTION
PRODUCT DAMAGE
• Ensure circuit breaker and its accessories are
always used within their designated ratings.
• Use the specially designed circuit breaker
handling truck (optional accessory) when
removing the circuit breaker from its cassette.
Failure to comply with these instructions may
result in product damage.
NOTICE
• Each charging action provides sufficient charge
for an Open-Close-Open Operation without
requiring additional charging.
• The mechanism works properly only when the
circuit breaker is mounted on a horizontal plane
with bottom mounting or on vertical plane with
front mounting.
CIRCUIT BREAKER OPENING
NOTICE
Tripping under fault conditions will be automatic
depending on the protective device installed and its
settings.
WAVEFORM CAPTURE
A total of eight cycles are captured:
• Four pre-trigger.
• Four post-trigger.
24 V external power is required for this feature.
When waveform capture is executed, the following
channels will be captured simultaneously: Phase A
current, Phase B Current, Phase C Current, Phase L1
voltage, Phase L2 voltage, Phase L3 voltage. See Table 17.
Table 17: Trigger Waveform Capture Events
Event Waveform Capture
Setpoint
Manual trigger over
communications
ON, OFF
Over current (GF, ST, LT, Inst) ON, OFF
Protective relays ON, OFF
Current alarm 1 ON, OFF
Current alarm 2 ON, OFF
EVENT LOGGING
The trip unit keeps a log of the last 10 events:
• Over current trips
• Protective relay trips
• Shunt trip (PBII and Global EntelliGuard G Trip Units
Only)
• Under voltage Release trip (PBII and Global
EntelliGuard G Trip Units Only)
• BIM Trip Unit Mismatch - Breaker Interface Module
The following information is stored with each event:
• RMS currents
•
Phase
• Type of trip
• Trip counter
• Time and date stamps
Trips are logged under self power without time stamp.
Events with time stamps are only logged when 24 V
control power is available.
All setup, status and metering information is accessed
through five keys whose functions are:
• Up: Scroll up or increment value
• Down: Scroll down or decrement value
• Right: Next function or next page
• Left: Previous function or previous page
• Enter: Save or setting in to memory
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