Vertiv™ NetSure™ External Distribution Box (EDB) Description and Installation Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
31
Alarm Circuit Cards P/N 541183 Description (For Reference Only)
Two (2) alarm cards (one per distribution panel) are provided to connect circuit breaker alarms into the alarm circuits of the
companion enclosure. External circuit breaker alarm (CBA) alarm wiring is factory connected from terminal block J3 located on alarm
circuit cards P/N 541183 to the enclosure’s alarm blocks. Refer to Figure 11.9 for alarm circuit cards P/N 541183 locations. Terminal
block J3 accepts a wire size in the range of 26 AWG to 14 AWG. Recommended torque is 0.5 Nm to 0.6 Nm.
•
If a circuit breaker on the respective distribution panel opens, relay contacts open between terminals 2 and 3 of J3 and relay
contacts close between terminals 3 and 4 of J3. Normal operation provides closed relay contacts between terminals 2 and 3
of J3 and open relay contacts between terminals 3 and 4 of J3.
•
If a circuit breaker on the respective distribution panel opens, -48 VDC / -58 VDC is provided at terminal 1 of J3.
Figure 11.9 Alarm Circuit Cards P/N 541183 Locations
11.7
Connecting Fiber Cables to the Enclosure
11.7.1
Optical Fiber Cables Precautions
When you work with optical fibers, you must take the following precautions:
•
Wear safety glasses when you install optical fibers.
•
Do not look into the opening of an optical fiber, or the opening of an optical fiber connector, if the optical fiber is active or the
unit has the power turned on.
•
Avoid direct exposure to optical fiber ends or optical connector ends where you can access the laser signal directly.
•
Clean your hands after you handle optical fibers. Small pieces of glass are not always visible and can damage your eyes.
•
Protect all optical fiber connectors with clean dust caps at all times.
•
Follow the bend radius rule when you route the fibers or store excess slack. Do not exceed the minimum bend radius for the
type of fibers being installed. Refer to manufacturer recommendations.
•
Do not stretch fibers when wrapping them around the fiber storage spools.
Front
Circuit Breaker Alarm
(CBA) Circuit Cards
FA
NC
COM
NO
J3
1
2
3
4
Circuit Breaker Alarm
(CBA) Circuit Card
Relay shown in the deenergized state.
Relay is normally deenergized and
energizes during an alarm condition.
