Dell ME Series, ME5012, ME5024, ME412, ME424 Manual

Introduction

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:

• ME5012
• ME5024
• ME412
• ME424

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.

Wiring requirements for a DC power cooling module

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 equipment must be connected directly to the DC supply system earthing electrode conductor or to a bonding jumper from an earthing terminal bar or bus to which the DC supply system earthing electrode conductor is connected.
• This equipment must be located in the same immediate area (such as adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same DC supply circuit and the earthing conductor, and also the point of earthing of the DC system. The DC system must not be earthed elsewhere.
• The DC supply source must be located within the same premises as this equipment.
• The earthed circuit conductor between the DC power source and the earthing electrode conductor must not be connected to switching or disconnecting devices.

Precaution statements

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.

DC power cooling module overview

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.

DC power cooling module back panel features

The following figure shows the back view of a DC power cooling module.

Figure 1. DC PCM back view

DC power cooling module indicators

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	Off: Normal operation. On steady: Fault is detected or service is required.
	Power status	Green	On steady: Power is on, and input voltage is normal. Off: Power is off or input voltage is below the minimum threshold.
	Fan	Amber	Off: Normal operation. On steady: Fault is detected or service is required.
	PCM status	Amber	Off: Normal operation. On steady: Fault is detected or service is required.
	Battery good	Green	On steady: Normal operation. Flashing: Battery is charging or it is discharging for maintenance. Off: Battery not present (if Battery Fault is also off). Off: Non-recoverable battery fault (if Battery Fault is also on).
	Battery fault	Amber	Off: Normal operation Flashing: Recoverable battery fault. On steady: Non-recoverable battery fault.

DC power cooling module removal and installation

Removing a DC power cooling module

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

1. Turn off the PCM power switch.
2. If the vendor-supplied power cable is used, disconnect the cable from the facility power, and go to step 4.
3. If the PCM is connected directly to facility power:
   1. Disconnect the facility power from the PCM.
   2. Remove the safety cover from the power terminal block.
   3. Use a No. 2 phillips-head screwdriver to remove or loosen the three screws that attach the cables to the PCM.
   4. Disconnect the two power cables from the terminal.
   5. Disconnect the ground cable from the terminal.
   6. Secure the screws and washers back onto the terminals.
   7. Install the safety cover onto the power supply power terminal block.
4. Press the release latch and slide the PCM out of the chassis.

The PCM is heavy; use both hands to guide it out of the chassis.

Installing the DC power cooling module

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

1. Verify that both PCMs are the same type and have the same maximum output power.
   NOTE: The maximum output power (shown in Watts) is listed on the PCM label.
2. Slide the new PCM into the chassis until the PCM is fully seated and the release latch snaps into place.
   NOTE: Before the power cable is connected, the fans start spinning, powered by the other PCM.
3. Ensure that the power switch is set to Off.
4. Connect power to the PCM as described in Connecting power.
   NOTE: When installing a new PCM, allow several seconds for the system to recognize the PCM and determine its status. The Power status indicator turns green to indicate that the PCM is functioning properly.

Connecting power

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.

Removing the vendor-supplied cable

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

1. Remove the safety cover from the power terminal block on the PCM.
2. Use a No. 2 phillips-head screwdriver to loosen each screw that secures a wire to the PCM:
   • Black wire from the -48 V terminal
   • Blue wire from the RTN terminal
   • Ground wire from the ground terminal on the PCM outside the power connector cover.
3. Reinstall screws and washers on the PCM power terminals.
4. Attach the safety cover over the power terminal block if you are not planning to connect power.
5. Connect power cables as described in Connecting the power cables.

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

• Use a No. 2 phillips-head screwdriver to secure the screws to the terminals.
• Torque screws to between 1.7 N-m and 2.3 N-m (15 in-lb and 20 in-lb).

Steps

1. Ensure that the power switch on the PCM is turned off.
2. Remove the safety cover from the PCM terminal block.
3. Attach the ground lug (1) to the ground terminal located outside the power safety cover.
4. Connect the DC power (2) to the -48 V terminal on the PCM and secure the wire with a screw and square washer.
5. Connect DC return (3) to the RTN terminal on the PCM and secure the wire with a screw and square washer.
   
   Figure 3. Power terminal connections
6. Attach the safety cover over the PCM power terminals.
7. Turn on power to the PCM.

Troubleshooting a 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.

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.

1. Verify that the power switch is in the ON position.
2. Locate the faulty PCM and determine the status of the LEDs. If the line input LED is not lit, follow these steps to check the power cable and power source to which the PCM is connected.
   1. Ensure that the power cable is securely attached to the power source and the PCM.
   2. Connect another device to the power source to verify if it is working.
   3. Connect the cable to a different power source.
   4. Replace the power cable.
3. Reset the PCM by removing and reinstalling it. For more information, see DC power cooling module installation and removal.

Technical specifications and regulatory information

DC power cooling module specifications

Documents / Resources

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