GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 13)

DEH-4567B EntelliGuard TU Trip Units: UL/ANSI Models
General Information
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ELECTRICAL REQUIREMENTS
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.
PowerBreak I, PowerBreak II, WavePro, AKR and
EntelliGuard G Trip Units are powered from three different
sources:
• Primary Current flow: Breaker current sensors provide
sufficient power to energize the LCD when at least 20%
of the sensor's ampere rating is flowing.
• +24 VDC control power. This is supplied externally, via
the circuit breaker’s secondary disconnect, or from the
GTUTK20 test kit, or from the portable battery pack,
(TVPBP and TVPBPACC). Each GTU draws 90mA
maximum.
• Internal battery power: Powers the unit temporarily
when any keypad key is pressed. Battery power
automatically turns off 20 sec after the last keypad
press. The battery power supply is disabled when any
current over 20% of the sensor rating is sensed through
the current sensors. Breaker status (open/closed) is not
reported under battery power.
Functions that require external 24 VDC:
• Communication (Modbus and Profibus)
• Zone Selective Interlocking—(Instantaneous only)
• WaveForm Capture
• Event log with time stamp
• Backlight
• Advanced Metering
• Relaying
• Input/output Contacts
• RELT – Reduced Energy Let Through
NOTICE
If 24 VDC supply drops below 22V, expect the
backlight of the trip unit to dim or shut off. In order to
ensure this does not happen, have a reliable,
consistent source of 24VDC.
EQUIPMENT INTERFACES
PowerBreak I, PowerBreak II, WavePro, AK, AKR, Conversion
Kits (for GE and other manufacturer breakers) and
EntelliGuard G Circuit Breakers.
Trip units do not require direct connections to the
equipment. All trip unit connections external to the breaker
are made through the circuit breaker secondary
disconnect.
The following trip unit interfaces are available at the
secondary disconnect:
• Serial Communications (RS-485)
• Zone Selective Interlocking digital input and output
• Digital Inputs (2)
• Relay Outputs (2)
• Fan control digital output (5000A WavePro and AKR)
• Remote Close digital output (EntelliGuard G with
Command Close Coils)
• Potential Transformer analog voltage Input
• Zero Sequence Current Transformer analog input
• 4th Pole Iron Core/Rogowski (neutral sensor) analog
input
The front panel test kit port provides an interface to the
GTUTK20 digital test kit. See DEH-4568A for additional
detail.
In addition, the MVT portable battery pack (TVPBP) can also
be used on the GTU using the TVPBPACC adaptor cable.
DEFINITIONS
BIM: Breaker Interface Module (only on EntelliGuard G). This
is a non-volatile memory device on the circuit breaker that
defines the breaker’s configuration to the trip unit. The BIM
stores configuration information on the breaker sensor
rating, it’s interrupting capacity, and the agency
requirements (UL, IEC, ANSI) the breaker meets.
RELT: Reduced Energy Let Through. A second
instantaneous trip function that can be temporarily
engaged during maintenance procedures to ensure the
breaker trips as quickly as possible to limit arc flash
damage.
ZSI: Zone Selective Interlocking: A wired signaling scheme
between cascaded breakers that enhances coordination
and can improve protection without impacting selectivity.
Available on Short Time, Ground Fault and Instantaneous.
WFR: Wave Form Recognition is the algorithm used in the
EntelliGuard G adjustable selective instantaneous trip
element to discern between unfettered fault current and