GE Power Management MDP Digital Time Overcurrent Relay 3-
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GEK-100682D 3 CONSTRUCTION
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3.2 DISPLAYS
The MDP relay has eight light-emitting diodes (LEDs) at the top of the front of the relay in order to indicate the
following situations:
• Ready. A green LED indicates that the relay is in operation.
• Pickup. An amber LED indicates that one of the protection units has picked up.
• Phase A trip. A red LED indicates that the A phase unit has produced a trip.
• Phase B trip. A red LED indicates that the B phase unit has produced a trip.
• Phase C trip. A red LED indicates that the C phase unit has produced a trip.
• Ground Trip. A red LED indicates that the ground unit has produced a trip.
LED combinations are defined as follows:
• Single Phase and Ground red LED indicates phase to ground fault.
• Two Phase red LEDs indicate Phase to Phase fault.
• Three Phase red LEDs indicate Three Phase fault.
• Three Phase and Ground red LEDs indicate three phase to ground fault.
• TOC Trip. A red LED indicates that the TOC element has produced a trip.
• IOC Trip. A red LED indicates that the IOC element has produced a trip.
3.3 RECEIVING, HANDLING, AND STORAGE
This relay contains electronic components that could be damaged by electrostatic discharge currents if those
currents flow through certain terminals of the components. The main source of electrostatic discharge currents
is the human body, and the conditions of low humidity, carpeted floors and isolating shoes are conducive to the
generation of electrostatic discharge currents.
Where these conditions exist, care should be exercised when removing and handling the modules. The per-
sons handling the module should make sure that their body charge has been discharged, by touching some
surface at ground potential, before touching any of the components on the modules.
These relays, when not included as part of a control panel, will be shipped in cartons designed to protect them
against damage. Immediately upon receipt of a relay, examine it for any damage sustained in transit. If dam-
age resulting from handling is evident, file a damage claim at once with the transportation company and
promptly notify the nearest General Electric Sales Office.
The relays should be stored in their original cartons. If the relays are not to be installed immediately, they
should be stored indoors in a place that is free from moisture, dust and metallic chips.
Courtesy of NationalSwitchgear.com
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