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This document describes how to install and connect power to the DC power cooling modules (PCMs) in your ME Series 2U storage systems.
The standard documentation that is supplied with your ME Series 2U system describes AC PCMs that are connected to an AC power source. Except for the information described in this document, all features of the AC PCM described in the standard documentation also apply to DC PCMs.
This document is applicable to the following systems:
In general, follow the instructions in the Hardware Owner's Manual or Deployment Guide for your ME Series system for installing and setting up your system.
For instructions related to installation and connecting power to the DC PCMs, follow the instructions that are provided in this supplement.
Observe the following warnings and cautions when working with the DC power cooling module.
For equipment using -(48-60) V DC power supplies, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Your warranty does not cover damage due to servicing that is not authorized by the vendor. Read and follow all safety instructions that came with the product.
An energy hazard exists if the safety ground cable is omitted or disconnected.
The system chassis must be positively grounded to the rack cabinet frame. Do not attempt to connect power to the system until grounding cables are connected.
This equipment is designed to permit the connection of the earthed conductor of the DC supply circuit to the earthing conductor on the equipment. See the installation instructions. If this connection is made, all of the following conditions must be met:
This product is intended for restricted access locations (dedicated equipment rooms, equipment closet, or the like) in accordance with the National Electrical Code, American National Standards Institute (ANSI)/National Fire Protection Association (NFPA) 70.
Connect the equipment to a –48 V DC supply source that is electrically isolated from the AC source (reliably grounded 48 V DC SELV source). Ensure that the –48 V DC source is secured to earth (ground).
A readily accessible disconnect device that is suitably approved and rated must be incorporated in the field wiring.
Wire the unit with copper only. Unless otherwise specified, use only 10 American Wire Gauge (AWG) wire rated minimum 90ºC (194ºF) for source and return. Protect the –(48–60) V DC (one wire) with a branch circuit overcurrent protection rated 30 A for DC with a high interrupt current rating.
When stranded wiring is required, use approved wiring termination, such as closed-loop or spade-type with upturned lugs. These terminations are the appropriate size for the wires and must be double crimped, one on the conductor and one on the insulation.
When you install the unit, always make the ground connection first, and disconnect it last to prevent an energy hazard.
Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available.
An ME5 Series storage system receives its power from two power cooling modules (PCMs). Each PCM contains two cooling fans.
NOTE: The fans that keep the storage enclosure cool are integrated into the PCM and cannot be replaced separately. If a fan fails, you must replace the entire PCM.
The following figure shows the back view of a DC power cooling module.
Figure 1. DC PCM back view
Index | Feature | Description |
1 | LED panel | Contains LEDs that indicate the PCM status. (See DC power cooling module indicators.) |
2 | Power switch | Controls the PCM power output to the storage array. |
3 | Power safety cover | Protects the PCM power terminal block. |
4 | DC ground terminal | Provides grounding for the PCM. This terminal must be connected to the building's protective safety earth ground. |
5 | Power supply release lever | Unlocks the PCM for removal from the storage enclosure. |
LEDs on the PCM indicate the module status. Under normal conditions, the Power status and Battery good LEDs are both on steady.
Figure 2. DC PCM LEDs
LED | Description | Color | Status |
![]() | DC Input | Amber |
|
![]() | Power status | Green |
|
![]() | Fan | Amber |
|
![]() | PCM status | Amber |
|
![]() | Battery good | Green |
|
![]() | Battery fault | Amber |
|
About this task
For equipment using –(48–60) V DC power supplies, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Your warranty does not cover damage due to servicing that is not authorized by the vendor. Read and follow all safety instructions that came with the product.
The system requires one power cooling module for normal operation. When the system is turned on, remove and replace only one PCM at a time.
Steps
The PCM is heavy; use both hands to guide it out of the chassis.
About this task
For equipment using –(48–60) V DC power supplies, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Your warranty does not cover damage due to servicing that is not authorized by the vendor. Read and follow all safety instructions that came with the product.
Steps
A DC power cable is connected to the PCM when it ships from the factory. You can connect the DC power cable directly to your facility power source. If required to conform to your rack cabling, you can remove the power cable and connect the facility power directly to the PCM.
NOTE: The power connection to the DC PCM is hard-wired directly to terminals on the unit.
The DC PCM ships from the factory with a power cable attached. If the cable connector does not match your environment, remove the cable and connect the PCM directly to your power source.
About this task
Ensure that power is not supplied to the PCM.
Steps
Connecting the power cables
Connect power directly to the PCM from your power source or by using the cable that is provided by the vendor. These instructions apply to connections made directly to your power source.
About this task
Steps
For equipment using –(48–60) V DC power supplies, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Your warranty does not cover damage due to servicing that is not authorized by the vendor. Read and follow all safety instructions that came with the product.
The system requires one PCM for normal operation. When the system is turned on, remove and replace only one PCM at a time.
A single PCM can be removed from a switched-on storage system for a maximum of five minutes. Beyond that time, the storage enclosure may automatically shut down to prevent damage.
NOTE: If a PCM fails, leave the failed PCM in the enclosure until the replacement PCM is available.
Specification | Measurement |
Maximum output power | 764W |
Voltage | –(48 - 72) VDC |
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download Dell ME Series, ME5012, ME5024, ME412, ME424 Manual
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