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3.7 Adding a Circuit Breaker to a List 21HA Distribution Panel
DANGER! Hazardous DC voltage (400V DC) is present. The distribution panel MUST be completely isolated from all power
sources.
Refer to Figure 5.1 as this procedure is being performed.
Procedure
1.
Power down and isolate the distribution panel from all power sources.
Refer to Figure 5.1 and attach the leads provided with the circuit breaker to the appropriate circuit breaker terminals. The
2.
leads are to be oriented so they exit the rear of the circuit breaker. Note that the DC load distribution leads are terminated in
a 2-hole lug and the DC input bus leads are terminated in a single-hole lug. Note also that the positive leads are red and the
negative leads are black. Torque these connections to 62 in-lbs (7 Nm).
3.
Remove the respective distribution position's blank cover from the distribution panel's top or bottom front cover.
4.
Remove the distribution panel's top or bottom front cover to access the circuit breaker wiring by removing the screws
securing the cover to the distribution panel.
5.
Place the circuit breaker into its mounting position, feeding the attached leads to the rear of the distribution panel. Orient the
ON/OFF positions as shown in Figure 5.1.
6.
Secure the circuit breaker leads as shown in Figure 5.1. Torque the DC input bus leads to 66 in-lbs (7 Nm). Torque the DC
load distribution leads to 66 in-lbs (7 Nm).
7.
Replace the distribution panel's top or bottom front cover. Secure the cover to the distribution panel.
8.
Place each circuit breaker to the OFF position.
9.
Connect all power sources to the distribution panel.
10.
Place each circuit breaker to the ON position.
11.
Ensure that there are no local or remote alarms active on the system.
4 Maintenance
Contact Vertiv for all of your maintenance needs.
4.1 Important Safety Instructions
DANGER! Adhere to the "Important Safety Instructions" presented at the front of this document.
4.2 System Maintenance Procedures
DANGER! The system MUST be completely powered down and isolated from all power sources (AC and battery) before any
maintenance procedure is performed, or use full PPE protection for arc flash.
It is recommended to perform the maintenance procedures listed in Table 4.1 every 12 months to ensure continual system operation.
Proprietary and Confidential © 2022 Vertiv Group Corp.
Vertiv™ NetSure™ 400V DC Power System User Manual
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