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Vertiv Liebert XDU070 Operation And Maintenance Manual
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Vertiv Liebert XDU070 Operation And Maintenance Manual

Vertiv Liebert XDU070 Operation And Maintenance Manual

Liquid to air coolant distribution unit
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XDU070 Coolant Distribution Unit
(Liquid to Air)
Operation and Maintenance Guide

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Summary of Contents for Vertiv Liebert XDU070

  • Page 1 XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide...
  • Page 2 The information contained in this document is subject to change without notice and may not be suitable for all applications. While every precaution has been taken to ensure the accuracy and completeness of this document, Vertiv assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions.

  • Page 3: Table Of Contents

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide TABLE OF CONTENTS 1 Important Safety Instructions 1.1 General 1.2 Installation and Handling 1.3 Application 1.4 Warranty 1.5 Electrical Connection 1.6 Replacement Parts 1.7 Waste Disposal 1.8 Documentation 2 Agency 2.1 Product Standards and Approvals...
  • Page 4 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.3.4 PI Control 4.3.5 PID Control 4.4 Alarm Management 4.5 Troubleshooting Alarms 4.6 Temperature Sensor Graph 4.7 Group Control 4.7.1 Group Control—Network Cabling 4.7.2 Group Control—Network Termination Resistors 4.7.3 Group Control—Network Addresses...

  • Page 5: Important Safety Instructions

    1 Important Safety Instructions Save These Instructions This manual contains important instructions that should be followed during operation and maintenance of the Vertiv™ XDU070 Coolant Distribution Unit. WARNING! Arc flash and electric shock hazard. Can cause serious injury or death. Building and equipment damage may also result.
  • Page 6 Shipping weights and unit weights are specified in the Vertiv™ XDU070 Application and Planning Guide SL- 71111. Use the center of gravity indicators on the unit to determine the position of the slings.
  • Page 7 Vertiv recommends installing a monitored fluid detection system that is wired to activate the automatic closure of field installed coolant fluid supply and return shut off valves to reduce the amount of coolant fluid leakage and consequential equipment and building damage.

  • Page 8: General

    Water leakage can result in severe property damage and loss of critical data center equipment. Do not locate unit directly above any equipment that could sustain water damage. Vertiv recommends installing monitored leak detection equipment for the unit and supply and return lines. NOTICE Risk of a catastrophic water circuit rupture.

  • Page 9: Installation And Handling

    Any parts replaced during maintenance or servicing must be the same specification as those being replaced and should only be obtained from Vertiv. The use of incorrect replacement parts may affect the operation or reliability of the unit and invalidate any warranty.

  • Page 10: Documentation

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 1.8 Documentation Operation and maintenance, maintenance, and installation and commissioning documentation as well as maintenance and service records must always remain with the unit. Proprietary and Confidential ©2024 Vertiv Group Corp.

  • Page 11: Agency

    Low Voltage directive 2014/35/EU, the EMC directive 2014/30/EU and the Pressure Equipment directive 2014/68/EU. As manufactured, Vertiv products are designed to comply with an IP21 rating. This product is cULus listed for the appropriate voltage models and certificates will be made available on request (cULus certificate pending).
  • Page 12 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp. 2 Agency...

  • Page 13: Product Description

    3 Product Description 3.1 General This document describes the physical and electrical characteristics of the Vertiv™ XDU070 for operation and maintenance purposes. The XDU070 contains a secondary closed loop circuit that provides a supply of cooling fluid to IT equipment for direct cooling (cold plates at chip level).

  • Page 14: Vertiv™ Xdu070 Model Number Nomenclature

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 3.3 Vertiv™ XDU070 Model Number Nomenclature The Vertiv™ XDU070 can be configured for voltage options to suit: • Any global location • Secondary filtration • Secondary top/bottom connections Table 3.1 below describes each digit of the model number.

  • Page 15: Product Views

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 3.4 Product Views Figure 3.1 Front View of Vertiv™ XDU070 (Doors and Side Panels Removed) 3 Product Description Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 16 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Item Description Redundant 48 VDC power supply (A and B) Touchscreen display Reservoir tank (2.16 gal/10 liter) Fill pump P4 (reservoir tank) Automatic air vents on filter Pressure sensors (quantity is 7)
  • Page 17 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 3.2 Rear View of Vertiv™ XDU070 (Doors and Side Panels Removed) 3 Product Description Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 18 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Item Description Automatic air vents (on coil headers) Access panel to 48 VDC distribution busbar and fuses Axial fans 48 VDC (quantity is 7) Fan fuse and connector...

  • Page 19: Operation

    4.1 Controller Overview The Vertiv™ XDU070 controller is designed to monitor and control the supply of cooling fluid to IT equipment in unattended data center environments. Circuit cooling fluid is closely controlled to a defined temperature and at a controlled differential pressure (or flow rate), for optimum heat management.

  • Page 20: Main Menu

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Item Description Menu icon CANbus group control status (visible when CANbus communication is configured) IP address information (tap text to open ethernet and IP communication status screen) Start/stop icon - Changes to green when unit is running Pressing the Menu icon in the bottom left corner displays the Main menu screen.

  • Page 21: Status Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.2.3 Status Screen The Status screen displays comprehensive information on the operating condition of the Vertiv™ XDU070 unit. Figure 4.3 Control System Status Screen There are four information pages within the Status screen. Details for each page are shown in the tables below.
  • Page 22 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.2 Status Screen Page 2 Item Value Pump 1 Speed ___% Flow Rate ___gpm (___ l/m) Fluid Return PS1 ___psi (___ bar) PS1a ___psi (___ bar) PS1b...

  • Page 23: Data Curves

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.4 Status Screen Page 4 (continued) Item Value Pump 1 Voltage ___ V Pump 2 Voltage ___ V Pump 1 Current ___ A Pump 2 Current ___ A Pump 1 Temperature ___ °F (___°C)

  • Page 24: Login Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 4.5 Alarms Screen 4.2.6 Login Screen There are 4 levels of access, listed below: • No access code (User Level 1) provides access to Login, Status, Data Curves and Alarm pages.

  • Page 25: Setup Screen

    Table 4.5 below to Table 4.14 on page 23 . NOTE: Information under Factory Configuration can be viewed with the service and engineer access codes. However, another code is required to make changes that is available on request from Vertiv. Figure 4.7 Setup Screen Table 4.5 Setup Screen - Factory Configuration...
  • Page 26 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.6 Setup Screen - Date and Time (continued) Title Description Default Range Unit P024 NTP Server IP Address IP address of the NTP Server 0.0.0.0 Configurable —...
  • Page 27 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.10 Setup Screen - IPv6 Connectivity (Interface A) Submenu Title Description Default Range Unit P1201 IPv6 Disabled P1202 SLAAC Select as required Disabled Enabled — Disabled P1203...

  • Page 28: Configuration Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.14 Setup Screen - Group Control (continued) Title Description Default Range Unit P085 Rotation Frequency Unit rotation frequency Weekly Weekly — Monthly Never P086 Rotation Day of Week Rotation day Mon.
  • Page 29 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.15 Configuration Screen - Filling Title Description Default Range Unit P101 Fill Pressure Start threshold for fill pump (0.8) 4.4 to 145 (0.3 to 1.0) P102 Fill Hysteresis Stop hysteresis for fill pump (0.2)
  • Page 30 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.17 Configuration Screen - Temperature Control Title Description Default Range Unit P301 Temperature Setpoint Set required fluid temperature 86 (30.0) 50 to 131 (10.0 to 55.0) °F (°C)
  • Page 31 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.19 Configuration Screen - Filters Title Description Default Range Unit P504 Fluid Filter Dirty Setpoint Differential pressure alarm (0.5) 3 to 145 (0.2 to 1.0) threshold for filter dirty...

  • Page 32: Service Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.22 Configuration Screen - Rotation (continued) Title Description Default Range Unit P804 Time of Day - Minutes Time of changeover (min) 00 to 59 mins 4.2.9 Service Screen The Service screen is visible only after login using the service or engineer login codes.
  • Page 33 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.23 Service Screen - Fill Pump Request Screen Prompt Explanation The Pump Fill function is used during commissioning only. This allows the fill pumps to run without a time limit. Fill pumps turns Off automatically when unit reaches required static pressure or when the reservoir tank is full.
  • Page 34 Overrides allows for manual control of some functions of the unit for a limited time period (default is 15 minutes) while the unit is running in automatic mode. This function is provided for troubleshooting purpose. If an override is issued while the Vertiv™...

  • Page 35: Diagnostic Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.30 Service Screen - Full Manual Control (continued) Title Description Default Range Unit S305* Reservoir Tank Fill Pump P4 Switch reservoir fill pump on 0 to 100...
  • Page 36 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.32 Diagnostics Screen - Universal Inputs 9 to 14 Description ADC Value Electrical Processed UI09 Reservoir Tank High Level 0.00 ohms UI10 Reservoir Tank Low Level 0.00 ohms...

  • Page 37: Group Control Status Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.2.11 Group Control Status Screen The CANbus status screen provides information on other Vertiv™ XDU070 connected to the CANbus network and configured to operate in group control. Figure 4.11 Group Control Status Screen 4.2.12 Ethernet and IP Communication Status Screen...

  • Page 38: Calibration Screen

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.2.13 Calibration Screen The touchscreen will enter calibration mode if the screen is pressed 20 times within a 4 second interval. To complete calibration follow the on screen instructions.
  • Page 39 This is a latched alarm and it will not be possible to restart the unit until after the even is manually cleared. The system pressure at the Vertiv™ XDU070 inlet (PS1) is continuously monitored to ensure that the system is always pressurized.
  • Page 40 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide During normal healthy running for run/standby pump operation the pumps operate on a duty sharing cycle. For example, every 7 days (default) the operational pump will ramp down to a stop and the standby pump will then start and continue operating for the next 7 days.
  • Page 41 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 4.15 Vertiv™ XDU070 Pressure and Level Flow Chart (Initial Startup) 4 Operation Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 42 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 4.16 Vertiv™ XDU070 Fill Pressure and Level Flow Charge (When Running) Proprietary and Confidential ©2024 Vertiv Group Corp. 4 Operation...
  • Page 43 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 4.17 Vertiv™ XDU070 Water Level Management (When Running) Temperature sensor (T4) monitors the fluid circuit return temperature and is used in conjunction with the flow rate to calculate the heat transfer duty.

  • Page 44: Air Path Circuit Operation

    4.3.2 Air Path Circuit Operation The ambient air temperature T2 is monitored at the inlet to the Vertiv™ XDU070 cabinet. The nominal 45 kW cooling performance of the XDU070 has been designed on an ambient temperature between 77 °F and 95 °F (25 °C and 35 °C) with a 18 °F (10 °C) approach temperature difference to the fluid outlet temperature.

  • Page 45: Pi Control

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.3.4 PI Control For systems that have reasonably steady or slowly changing heat loads, PI control only should be sufficient. Set the Proportional Band to 2.2 x the Proportional Band setting at which the system became unstable.
  • Page 46 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 4.19 Control Screen Active Alarms Access the alarm descriptions by selecting the columns where the alarms appear. Some alarms self-clear if the condition is transient. For example, a temperature goes over an alarm threshold then comes back to a healthy condition or when a fault has been rectified such as when a faulty sensor has been replaced.

  • Page 47: Troubleshooting Alarms

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 4.5 Troubleshooting Alarms Alarms are events which may cause the unit to shut down and must be investigated immediately. Severity classifications are: Unit shutdown. Shutdown IT immediately. 2. Urgent alarm. Immediate investigation required, prepare to shutdown IT, if required.
  • Page 48 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.36 Code Severity Classifications (continued) Code Description Severity Self-Clear Latching Shutdown Delay Action Check sensor connections to the control board, check inline connections, replace sensor. PS1b Pressure Sensor Fault ü...
  • Page 49 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.36 Code Severity Classifications (continued) Code Description Severity Self-Clear Latching Shutdown Delay has gone into fault condition, Pump 1 will then run. Action Replace Pump 2. Fluid Pump Shutdown ü...
  • Page 50 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.36 Code Severity Classifications (continued) Code Description Severity Self-Clear Latching Shutdown Delay Unit Level Sensor – No Fluid Detected ü Detail While Unit is Running only – If unit level sensor is open circuit for more than 1 second. then this alarm will be raised, providing flow or DP depending on control function set is >50% of flow/DP setpoint.
  • Page 51 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.36 Code Severity Classifications (continued) Code Description Severity Self-Clear Latching Shutdown Delay Fan 1 Fault ü Detail Fan 2 feedback signal is significantly adrift of demand for a period of 30 seconds (default) or more.
  • Page 52 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Table 4.36 Code Severity Classifications (continued) Code Description Severity Self-Clear Latching Shutdown Delay or Alarm + Unit Shutdown. Action Identify and repair leak. Pump 1 Filter Dirty ü...

  • Page 53: Temperature Sensor Graph

    Figure 4.21 Temperature Sensor Resistance Graph 4.7 Group Control This section is applicable if more than one Vertiv™ XDU070 is installed per system. Groups of up to eight XDU070s can be connected using a high speed, robust twisted pair CANbus network in order to provide coordinated control in larger installation and N+X redundancy.

  • Page 54: Group Control-Network Cabling

    Figure 4.22 Group Control 4.7.1 Group Control—Network Cabling CANbus is used for communication between Vertiv™ XDU070 units for group control. CANbus always requires at least 3 conductors: 2 signal wires (CAN Hand CAN L) and a 1 signal return path.

  • Page 55: Group Control-Network Termination Resistors

    4.7.2 Group Control—Network Termination Resistors The Vertiv™ XDU070 controller includes an onboard 120 ohm resistor which can be activated by fitting a hardware jumper. If only one XDU070 unit is installed, the resistor does not require activation. For a two unit installation, both units should have the termination resistors enabled.

  • Page 56: Group Control-Network Addresses

    Jumper not fitted = Termination resistor not activated 4.7.3 Group Control—Network Addresses Each Vertiv™ XDU070 must be given a unique address. A XDU070 network addresses should be allocated to each unit in ascending order, starting from 1. The XDU070 network address is configured via Setup screen > Unit Address (P081). Configure each XDU070 so that it is aware of the other XDU070 devices on the network: Enter the total number of XDU070 units in the networked system via Setup screen >...

  • Page 57: Group Control-Controls

    4.7.5 Group Control—Controls When in group control, the lead Vertiv™ XDU070 modulates its pump speed to maintain a differential pressure setpoint. The differential pressure setpoint default is an average over all the individual running XDU070 differential pressure readings. This can be changed to the differential pressure over all XDU135O in the group in Seh1p/Group Control/P094 regardless if they are running.
  • Page 58 Figure 4.28 Lead Communication Failure In the event of a sensor failure, all sensors related to control (PS1, PS2 and T2) are redundant at the Vertiv™ XDU070 level, so a single sensor failure will not impact the operation or the status of the XDU070. So, if the lead XDU070 does have a sensor failure it will not result in a change of lead.

  • Page 59: Maintenance

    5.1 General The Vertiv™ XDU070 should be cleaned on a regular basis and checked for leaks and malfunctions. Maintenance should only be carried out by personnel qualified to work on this type of equipment. For information on maintenance or service support, contact Vertiv representative.

  • Page 60: General Settings

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 5.3.3 General Settings • Record unit serial number on maintenance check list. • Record values from controller display home page. 5.3.4 Controller Checks Setpoints and alarm actions, group control, download logs.

  • Page 61: Functional Checks

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide 5.3.8 Functional Checks May require unit shutdown. Check with customer before continuing. • Check controller, display and security gateway (if fitted) firmware status and upgrade, if necessary. •...
  • Page 62 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 5.2 Servicing Fluid Filters Demonstrated on Pump B Filter, Steps 3 and 4 Item Description After draining filter, undo and remove clamp ring Withdraw filter screen from housing The secondary filters may be removed and cleaned using this procedure: Close isolation valves located on pump inlet and filter of the filter to be serviced.

  • Page 63: Unit Draining

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Check the condition of the O-ring seal at the base of the filter screen and the face seal at the top before re- assembling and replace if there are any signs of damage. When opening the valves, open the pump inlet valve initially until all the contained air is purged out of the filter housing through the automatic air-vent, before then opening the filter outlet valve.

  • Page 64: Drip Tray Hand Pump

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 5.4 Drain Valve Locations Item Description Coil header drain valves Drain valve on each pump outlet Return pipe Y-branch drain valve Expansion vessel drain valve Drain valve on each pump inlet 5.5.2 Drip Tray Hand Pump...
  • Page 65 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Figure 5.5 Drip Tray Hand Pump 5 Maintenance Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 66 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp. 5 Maintenance...

  • Page 67: Appendices

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Appendices Appendix A: Technical Support and Contacts A.1 Technical Support/Service in the United States Vertiv Group Corporation 24x7 dispatch of technicians for all products. 1-800-543-2378 Liebert® Thermal Management Products 1-800-543-2378 Liebert®...
  • Page 68 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp. Appendices...

  • Page 69: Appendix B: Piping Schematic

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Appendix B: Piping Schematic Figure B.1 Piping Schematic Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 70 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp.

  • Page 71: Appendix C: Notes

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Appendix C: Notes Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 72 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp.

  • Page 73: Appendix D: Disposal Procedure

    Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide Appendix D: Disposal Procedure Waste materials must be disposed of in a responsible manner in line with environmental regulations. Decommissioning and disposal of this product should be undertaken by qualified personnel in adherence to local and national safety regulations, particularly for protection of lungs, eyes, and skin from chemicals, dust etc.
  • Page 74 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide This page intentionally left blank Proprietary and Confidential ©2024 Vertiv Group Corp.
  • Page 75 Vertiv™ XDU070 Coolant Distribution Unit (Liquid to Air) Operation and Maintenance Guide...
  • Page 76 Vertiv.com | Vertiv Headquarters, 505 N Cleveland Ave, Westerville, OH 43082 USA ©2024 Vertiv Group Corp. All rights reserved. Vertiv™ and the Vertiv logo are trademarks or registered trademarks of Vertiv Group Corp. All other names and logos referred to are trade names, trademarks or registered trademarks of their respective owners. While every precaution has been taken to ensure accuracy and completeness here, Vertiv Group Corp.