Lenovo Neptune DWC RM100 Operating manual

Lenovo Neptune DWC RM100
in-rack Coolant Distribution Unit
(CDU)
OPERATION & MAINTENANCE GUIDE

CDU Operating & Maintenance Guide Page 2
Neptune DWC RM100 in-rack Coolant Distribution Unit
INFORMATION ABOUT THIS GUIDE
Using the document
This document has been produced for double-sided printing and viewing as a PDF file (subject
to copyright). Further, or up to date copies of this guide can be obtained from the address on
the front page of this document. This document is not controlled, distributed copies will not be
updated automatically. Specifications could be subject to change without prior notice as
design improvements are implemented.
Copyright Notice
The information in this document is provided only for use by Cooltera customers and system
owners and is not to be reproduced or released to anyone else. Nor is it to be used for
reproduction of this unit or any of its systems or components parts.
Disclaimer
Cooltera Limited shall not be liable for any damages resulting from misapplication or misuse
of its products. Errors & Omissions Excepted.
GENERAL STATEMENT
Product Standards and Approvals
Cooltera products installed and operated in compliance with this document, the operation &
maintenance guide and installation & commissioning guide, conform to the Low Voltage
directive 2014/35/EU, the EMC directive 2014/30/EU and the Pressure Equipment directive
2014/68/EU. As manufactured, Cooltera products are designed to comply with an IP21 rating.
This product is cUL listed for the appropriate voltage models and certificates will be made
available on request (cUL certificate pending).
ROHS 2 Compliance
Cooltera Limited certifies that all products manufactured and supplied by Cooltera are fully
RoHS compliant in accordance with EU RoHS Directives 2002/95/EC –2011/65/EU and the
Council of 8 June 2011 directives, unless specified otherwise.
ISO 9001
Cooltera Ltd is an ISO 9001: 2015 registered company for Quality Management, certificate no.
14135144.

CDU Operating & Maintenance Guide Page 3
Neptune DWC RM100 in-rack Coolant Distribution Unit
Contents
Safety Information......................................................................................................................... 5
Safety Notices ........................................................................................................................... 5
Safety Instructions ..................................................................................................................... 5
1. Product Description ................................................................................................................... 7
1.1 General ............................................................................................................................... 7
1.2 Product Views...................................................................................................................... 8
2. Operation................................................................................................................................ 10
2.1 Controller Overview............................................................................................................ 10
2.2 User Interface .................................................................................................................... 10
2.2.1 HOME Screen................................................................................................................. 10
2.2.2 Main MENU Screen......................................................................................................... 10
2.2.3 STATUS Screen.............................................................................................................. 11
2.2.4 DATA CURVES Screen (real time update) ........................................................................ 12
2.2.5 ALARM Screen................................................................................................................ 12
2.2.6 LOG-IN Screen................................................................................................................ 13
2.2.7 SETUP Screen................................................................................................................ 14
2.2.8 CONFIGURATION Screen............................................................................................... 16
2.2.9 SERVICE Screen ............................................................................................................ 18
2.2.10 DIAGNOSTICS Screen .................................................................................................. 20
2.2.11 CALIBRATION Screen................................................................................................... 21
2.3 Automatic Operation........................................................................................................... 21
2.3.1 Secondary Circuit Operation............................................................................................. 21
2.3.2 Primary Circuit Operation................................................................................................. 27
2.4 Temperature Control Loop Adjustment................................................................................. 28
2.4.1 PI Control........................................................................................................................ 28
2.4.2 PID Control ..................................................................................................................... 28
2.5 Alarm Management ............................................................................................................ 28
2.6 Trouble Shooting (Alarms) .................................................................................................. 30
2.7 Temperature Sensor Graph................................................................................................. 35
3. Maintenance ........................................................................................................................... 36
3.1 General ............................................................................................................................. 36
3.2 Fluid Specifications............................................................................................................. 36
3.3 Planned Maintenance......................................................................................................... 36
3.3.1 Special tools/equipment................................................................................................... 36
3.3.2 Visual checks for damage & leakage................................................................................. 36
3.3.3 General settings .............................................................................................................. 36
3.3.4 Controller checks............................................................................................................. 37
3.3.5 Communication checks.................................................................................................... 37
3.3.6 Sensor checks................................................................................................................. 37

CDU Operating & Maintenance Guide Page 4
Neptune DWC RM100 in-rack Coolant Distribution Unit
3.3.7 Fluid checks ....................................................................................................................37
3.3.8 Functional checks ............................................................................................................37
3.4 Secondary Filter Service .....................................................................................................38
3.5 Spare Parts ........................................................................................................................38
4. Additional Information...............................................................................................................40
4.1 Wiring Diagram (WD00003-01)............................................................................................40
4.2 Pipe Schematic (SC00002-01).............................................................................................47
4.3 Warranty & Contact Details..................................................................................................49
Figures
Fig.1 –Front View of RM100 .......................................................................................................... 8
Fig.2 –Rear View of RM100 (with hose connection detail) ...................................................... 9
Fig.3 –Control System Home Screen ............................................................................................ 10
Fig.4 –Control System main Menu Screen ............................................................................... 11
Fig.5 –Control System Status Screen ............................................................................................ 11
Fig.6 –Control System Data Curves Screen ............................................................................... 13
Fig.7 –Control System Alarms Screen ............................................................................................ 13
Fig.8 –Control System Log-in Screen ............................................................................................ 14
Fig.9 –Control System Setup Screen ............................................................................................ 14
Fig.10 –Control System Configuration Screen ............................................................................... 16
Fig.11 –Control System Service Screen ............................................................................................ 18
Fig.12 –Control System Diagnostics Screen ............................................................................... 20
Fig.13 –Control System Calibration Screen ............................................................................... 21
Fig.14 –Control System On/Off Button ............................................................................................ 21
Fig.15 –Fill Required Warning ......................................................................................................... 21
Fig.16 –Fill Pump Manual Activation ............................................................................................ 22
Fig.17 –Fill Pressure & Level Flow Chart (at initial start) .................................................................. 22
Fig.18 –Fill Pressure & Level Flow Chart (when running) .................................................................. 23
Fig.19 –Water Level Management Flow Chart (when running) ..................................................... 24
Fig.20 –Control System Alarm Indication ............................................................................... 27
Fig.21 –Control System Active Alarms ............................................................................................ 28
Fig.22 –Control System Alarm Identification ............................................................................... 28
Fig.23 –Temperature Resistance Chart ............................................................................................ 34
Fig.24 –Servicing Secondary Filter ............................................................................................ 36

CDU Operating & Maintenance Guide Page 5
Neptune DWC RM100 in-rack Coolant Distribution Unit
Safety Information
Safety Notices
This manual contains Warnings, Cautions and Notices concerning the safe use of this product. See
documentation below.
WARNING! Indicates a potential hazardous situation which, if not avoided, could result
in death, serious injury or serious equipment damage. It is important not to proceed
until all stated conditions are met and clearly understood.
CAUTION! Indicates a potential hazardous situation which, if not avoided, could result
in minor to moderate injury or equipment damage. It is important not to proceed until
all stated conditions are met and clearly understood.
NOTICE! Indicates instructions that must be followed to avoid damage to the FS400 or
other equipment.
Safety Instructions
General
Mechanical and electrical equipment such as coolant distribution units (CDU’s) present potential
mechanical and electrical hazards. All safety, installation, operation and maintenance instructions
must be adhered to. Any work on or use of the equipment must only be carried out by technically
competent personnel who are fully trained. This product is designed to minimize all potential hazards
by restricting access through unit casings, doors and covers while equipment is operational.
Before any maintenance work being carried out, ensure:
1. Equipment is switched OFF
2. Equipment and controls are disconnected from the electrical supply.
3. All rotating parts such as pumps and 3-way valve have come to rest.
If in any doubt over anything regarding safety, installation, operation or maintenance instructions,
it is essential that the manufacturer, their agent or appointed representative is consulted for
clarification and advice.
Installation / Handling
Installation and operation must be conducted in accordance with local and national regulations and
normal codes of good practice. When moving or lifting the product, caution must be observed to
ensure the safety of personnel. Only the appropriate lifting equipment must be used.
Application
This product is to be used indoors only and must be only used for the application it was designed for.
This product must not be used in a hazardous environment.
Warranty
Failure to comply with the Lenovo Limited’s installation, maintenance and operation instructions may
affect the reliability and performance of the unit and invalidate any warranty.

CDU Operating & Maintenance Guide Page 6
Neptune DWC RM100 in-rack Coolant Distribution Unit
Electrical Connection
WARNING! This unit is powered by HIGH VOLTAGE. Serious injury or death can
occur. Power supplied to this product must be provided with an external means of
isolation.
Electrical connections should be carried out in accordance with local and national regulations by a
qualified electrician. Never make any electrical connections inside, or to the unit unless the electricity
supply has been switched OFF at the disconnect (isolator).
Replacement Parts
Any parts replaced during maintenance or servicing must be the same specification as those being
replaced and should only be obtained from Lenovo service.
The use of incorrect replacement parts may affect the operation or reliability of the unit and
invalidate any warranty.
Waste disposal
Any waste orsingle use materials must be disposed ofin a responsible manner and in strict adherence
to local and national environmental regulations. For details, consult local environmental agencies.
Documentation
Operation and maintenance documentation together with commissioning, maintenance or service
records must remain with the unit always.

CDU Operating & Maintenance Guide Page 7
Neptune DWC RM100 in-rack Coolant Distribution Unit
1. Product Description
1.1 General
This document describes the basic characteristics & operation of the RM100 Coolant Distribution Unit
(CDU) and the required ongoing maintenance considerations.
The CDU contains a Secondary closed loop circuit that provides a supply of cooling water to IT equipment,
either through indirect cooling (e.g. rack mounted rear door heat exchangers), or direct cooling (e.g. cold
plates at chip level).
The Secondary circuit loop is a low pressure sealed system with the heat removed from the high heat
density areas of IT equipment rejected to an external cooled water source (Primary circuit) via a low
pressure drop plate heat exchanger.
The Secondary circuit ensures that the cooling fluid in a data centre environment can be kept to a
minimum volume, is closely controlled for flow, pressure & temperature (with condensation control) and
can be accurately maintained for fluid quality (with filtration & additives).
The Primary cooling source can be a chilled water system (either dedicated or from building system), fluid
cooler, cooling toweror dryair cooler, depending on the desired Secondary temperature and heat transfer
duty (refer to Sections 2.6 & 2.7 of Application & Planning Guide for more information).

CDU Operating & Maintenance Guide Page 8
Neptune DWC RM100 in-rack Coolant Distribution Unit
1.2 Product Views
Fig.1 - Front View of RM100 (top cover panel removed)
Secondary Circuit
Pumps
Controller 7”
Touchscreen Display
Fluid make-up
connection
Plate Heat Exchanger
Removable Fascia
Panel
Pump 48v DC Power Supply
Primary Circuit
Control Valve
24v DC Power Supply
Dual Ethernet (RJ45)
Connections
Control Board
Temperature Sensors
Fill Pump
USB Connection

CDU Operating & Maintenance Guide Page 9
Neptune DWC RM100 in-rack Coolant Distribution Unit
Fig.2 - Rear View of RM100 (with hose
connection detail)
Level Sensor
Pressure Relief Valve
set at 3.5 Bar/50 psi (not shown)
Secondary Flow Meter
Cooling Fans
Pressure Sensors
Reservoir Tank with
50µ Secondary Filter
Reservoir/Secondary
Circuit Drain
Expansion Vessel
Reservoir/Secondary
Circuit Vent
Pressure Relief
Valve Outlet
A & B 1ph Power
Connections with Fuses
Secondary Circuit Return
Connectors for:-
External Temp/Hum Sensor
External Leak Detection Tape
RS485 & CanBus Comms
Primary Circuit Supply
Primary Circuit Return
Secondary Circuit Supply

CDU Operating & Maintenance Guide Page 10
Neptune DWC RM100 in-rack Coolant Distribution Unit
2. Operation
2.1 Controller Overview
The RM100 controller is designed to monitor and control the supply of cooling water to IT equipment
in unattended data centre environments. Secondary circuit cooling water is closely controlled to a
defined temperature and at a controlled differential pressure (or flow rate), for optimum management
of heat rejection.
When power is first applied to the unit, the touchscreen will illuminate, and the pump drive will
energize. After a short initialisation period, the display will default to the Home screen, as shown below.
2.2 User Interface
2.2.1 HOME Screen
The Home screen displays a schematic representation of the CDU, showing essential temperatures,
pressures, flows etc. for both Primary & Secondary circuits, plus the product code identification, installed
software version and date/time.
Pressing the Menu icon in the bottom right hand corner will display the following Main Menu screen…
2.2.2 Main MENU Screen
The Menu screen displays further accessible sub-menus for an increased level of information and
alteration of certain parameters.
NOTICE! Some Control System menus may not be visible if the user has not Logged-in
and visibility will also depend on the Log-in access level used.
The touchscreen display has been designed to be intuitive and any user should be able to easily negotiate
through the various menus without the need for this guide. However, the following explanation is
available for additional information, or as a reference for when the user is not in front of the unit.
Menu icon
Start/Stop icon –
changes to red when
unit is stopped
12/10/2022 11:34
RM100-Version 1.6
Fig.3 –Control System Home screen

CDU Operating & Maintenance Guide Page 11
Neptune DWC RM100 in-rack Coolant Distribution Unit
2.2.3 STATUS Screen
The Status screen displays comprehensive viewable only information on the operating condition of the
RM100 unit.
NOTICE! If the unit has not been configured for certain options, then corresponding
values will not be shown. e.g. Room temp/hum etc. will show ‘-101’
There are 4 information pages within the ‘Status’screen and the details for each page are shown in
the tables below.
Status –Page 1 (as shown)
Unit Mode
(Standby / On-line (running) / Fault / Shutdown)
Primary Cooling Duty
_ _ kW
Secondary Cooling Duty
_ _ kW
Cooling Mode
(Off / Fixed Setpoint / DW Override)
Fixed Setpoint
_ _ °C
Dew Point Setpoint
_ _ °C
Cooling Demand
_ _ %
Cooling Feedback
_ _ %
Secondary Return Temperature T2
_ _ °C
T2a
_ _ °C
T2b
_ _ °C
T2c
_ _ °C
Secondary Return Temperature T4
_ _ °C
Only visible when
logged-in
Only visible when
logged-in at
Service or
Engineer level
Return to
Home screen
Fig.4 –Control System main Menu screen
Fig.5 –Control System Status screen

CDU Operating & Maintenance Guide Page 12
Neptune DWC RM100 in-rack Coolant Distribution Unit
Status –Page 2
Primary Supply Temperature T1
_ _ °C
Primary Return Temperature T5
_ _ °C
Primary Flow Rate
_ _ l/m
Ambient Temperature
_ _ °C
Ambient RH
_ _ %
Dew Point
_ _ °C
Status –Page 3
Secondary Flow Rate
_ _ l/m
Secondary Return Pressure PS1
_ _ Bar
Pump Inlet Pressure PS2
_ _ Bar
Secondary Supply Pressure PS3
_ _ Bar
Unit Differential Pressure PS3-PS1
_ _ Bar
Filter Differential Pressure PS1-PS2
_ _ Bar
Pump 1 Speed
_ _ %
Pump 2 Speed
_ _ %
Status –Page 4
Pump 1 Hours Run
_ _ Hrs
Pump 2 Hours Run
_ _ Hrs
Valve Runtime 0 to 25%
_ _ Hrs
Valve Runtime 26 to 50%
_ _ Hrs
Valve Runtime 51 to 75%
_ _ Hrs
Valve Runtime 76 to 100%
_ _ Hrs
Elapsed Minutes
_ _ mins
Controller Software Version
_ _
MicroSD Used Space
_ _ %
Status –Page 5
Pump 1 Comms Status
_ _
Pump 2 Comms Status
_ _
Pump 1 Mode
_ _
Pump 2 Mode
_ _
Pump 1 Speed
_ _ rpm
Pump 2 Speed
_ _ rpm
Pump 1 Voltage
_ _ V
Pump 2 Voltage
_ _ V
Pump 1 Current
_ _ A
Pump 2 Current
_ _ A
Pump 1 Temperature
_ _ °C
Pump 2 Temperature
_ _ °C
Drive 1 Temperature
_ _ °C
Drive 2 Temperature
_ _ °C
2.2.4 DATA CURVES Screen (real time update)
The Data Curves screen displays a graphical representation of two pieces of variable data. A ‘red’ trace
for Cooling (Control Valve) Demand and a ‘yellow’ trace for Secondary Supply Temperature T2, both
of which will update in real time (time span of display is 3 minutes).
2.2.5 ALARM Screen
The Alarm screen can be used to view new or active Alarms and to acknowledge these events. Refer
to Section 2.6 for a full list of Alarms & further information.
Fig.6 –Control System Data Curves screen

CDU Operating & Maintenance Guide Page 13
Neptune DWC RM100 in-rack Coolant Distribution Unit
2.2.6 LOG-IN Screen
The Log-in screen allows the user access to further information and to adjust various parameters and
settings when logged-in at Service or Engineer level.
No access code (User Level 1) –provides access to Login, Status, Data Curves and Alarm pages
Code 1234 (User Level 2) –provides Read Only access to Setup, Configuration and Diagnose
menus
Code 5699 (Service Level) –provides full read only access to everything and write access to select
configuration and service features
Code xxxx (Engineer Level) –full read/write access to all features
Code xxxx (+Engineer Level) –enter after Eng. Level code for Factory Setup
Log-in codes are available on request from the manufacturer. Entering an invalid code will result in the
following message: -
Fig.7 –Control System Alarms screen
Fig.8 –Control System Log-in screen

CDU Operating & Maintenance Guide Page 14
Neptune DWC RM100 in-rack Coolant Distribution Unit
NOTICE! The following menu screens will only be visible once Logged-in
2.2.7 SETUP Screen
The Setup screen will not normally need to be accessed. Items within this screen will either be set at
the factory, or during commissioning. However, adjustments may need to be made following any site
upgrade.
NOTICE! Information under ‘Factory Configuration’ (ringed in red below) can be viewed
with Service & Engineer access codes, but to make changes will require a further special
code
Setup - Factory Configuration
ID
Title
Description
Range
P001
Primary Return Temp T5
Fitted
Select according to unit build
Yes - No
Setup - Date & Time
ID
Title
Description
Default
Range
Unit
Date
Adjust date
-
dd/mm/yy
-
P021
Date Format
Select preferred format
dd/mm/yy
dd/mm/yyyy
mm/dd/yyyy
yyyy/mm/dd
-
Time
Adjust time (24 hour clock)
-
hh/mm/ss
-
Setup - Display
ID
Title
Description
Default
Range
Unit
P030
Screen Saver / Logout
Period
Elapsed time before screen saver launches or
display auto logs out
30
1 to 60
mins
P031
Backlight Period
Elapsed time before screen dims
10
1 to 60
mins
Fig.9 –Control System Setup screen

CDU Operating & Maintenance Guide Page 15
Neptune DWC RM100 in-rack Coolant Distribution Unit
Setup - IP Connectivity
ID
Title
Description
Default
Range
Unit
P040
Interface #1 Enabled
Set to active or not (see below for sub-menu details)
Enabled
Enable - Disable
-
P041
Interface #2 Enabled
Set to active or not (see below for sub-menu details)
Enabled
Enable - Disable
-
P042
Failover Mode
Set to Redundant or Independent IP
addresses
Disabled
Enable - Disable
-
Setup –IP Connectivity (Interface 1) sub-menu
ID
Title
Description
Default
Range
Unit
P050
MAC Address
View MAC address
_ _._ _._ _._ _._ _._ _
Read only
-
P051
DHCP
Select as required
Disabled
Enable - Disable
-
P052
IP Address
Set IP address
192.168.11.170
Configurable
-
P053
Subnet Mask
Set Subnet Mask
255.255.255.0
Configurable
-
P054
Default Gateway
Set Gateway address
0.0.0.0
Configurable
-
P055
Preferred DNS Server
Set DNS address
0.0.0.0
Configurable
-
P056
Alternative DNS Server
Set DNS address
0.0.0.0
Configurable
-
P057
SNMPv2 Access
enable SNMPv2 access
No
Yes –No
-
P058
TELNET Access
enable TELNET access
No
Yes –No
-
P059
ftp Access
enable ftp access
No
Yes –No
-
Setup –IP Connectivity (Interface 2) sub-menu
ID
Title
Description
Default
Range
Unit
P060
MAC Address
View MAC address
_ _._ _._ _._ _._ _._ _
Read only
-
P061
DHCP
Select as required
Disabled
Enable - Disable
-
P062
IP Address
Set IP address
192.168.11.170
Configurable
-
P063
Subnet Mask
Set Subnet Mask
255.255.255.0
Configurable
-
P064
Default Gateway
Set Gateway address
0.0.0.0
Configurable
-
P065
Preferred DNS Server
Set DNS address
0.0.0.0
Configurable
-
P066
Alternative DNS Server
Set DNS address
0.0.0.0
Configurable
-
P067
SNMPv2 Access
enable SNMPv2 access
No
Yes –No
-
P068
TELNET Access
enable TELNET access
No
Yes –No
-
P069
ftp Access
enable ftp access
No
Yes –No
-
Setup - Modbus RS485
ID
Title
Description
Default
Range
Unit
P070
Modbus Slave Address
Set required address
1
1 to 247
-
P071
Baud Rate
Set required baud rate
9600
9600 to
38400
-
Setup - Group Control
ID
Title
Description
Default
Range
Unit
P081
Unit Address
1
1 to 8
-
P082
Number of Units in Group
1
1 to 8
-
P083
Number of Run Units
1
1 to 8
-
P084
Control Reference
P085
Rotation Frequency
Weekly
Weekly,
Monthly, Never
-
P086
Rotation Day of Week
Mon.
Sun. to Sat.
-
P087
Rotation Time of Day - Hours
10
00 to 23
hrs
P088
Rotation Time of Day - Minutes
00
00 to 59
mins
P089
CDU Receive Timeout Period
0
msecs
P090
CDU Transmit Period
1
msecs
P091
Baud Rate Index
0

CDU Operating & Maintenance Guide Page 16
Neptune DWC RM100 in-rack Coolant Distribution Unit
2.2.8 CONFIGURATION Screen
The Configuration screen can be used to set specific parameters and control functions.
NOTICE! Parameter ID’s shown in ‘red’ text will only be accessible with the Engineer
log-in code.
Configuration - Filling
ID
Title
Description
Default
Range
Unit
P101
Fill Pressure
Start threshold for fill pump
0.8
0.3 to 1.0
Bar
P102
Fill Hysteresis
Stop hysteresis for fill pump
0.2
0.1 to 0.5
Bar
P103
Fill Pump Run Period
Time for level sensor to make, or fill pressure to
be satisfied, prior to alarm (when unit is on-line)
1
1 to 15
min
P104
Level Sensor Delay
Level Senor response time, prior to alarm
1
1 to 6
secs
P105
Fill Start Delay Period
Delay prior to pump start after initiate signal
10
1 to 60
secs
P106
Fill Warning Delay Period
Delay prior to ‘check make-up’ alarm activated
5
0 to 60
secs
P107
Manual Fill Control
Select Manual or Automatic Fill pump control
0 = Manual; 1 = Automatic
1
0 or 1
-
Configuration –Pump Control
ID
Title
Description
Default
Range
Unit
P201
Control Type
Select pump speed controlled by flow or DP
Flow
Flow or DP
-
P202
Flow Setpoint
Set the required Secondary flow rate
50
5 to 130
l/m
P203
Differential Pressure Setpoint
Set the required Secondary differential
pressure (DP)
0.3
0.1 to 4.0
Bar
P204
Low Flow %
Low flow alarm threshold (% of flow setpoint)
90
50 to 95
%
P205
Low DP Hys
Low DP alarm hysteresis
0.5
0.1 to 3
bar
P206
Low Flow/DP Delay
Time delay prior to low Flow/DP alarm
100
1 to 300
secs
P207
Minimum Pump Speed
Set minimum pump running speed
10
10 to 70
%
P211
Over-pressure Setpoint
Maximum system pressure, prior to alarm
6.0
2.0 to 7.0
Bar
P212
Over-pressure Action
Alarm only, or shutdown & alarm
Alarm
Alarm or
Alarm+S/D
-
P213
Start-up Speed
Initial pump start fixed speed (0 = Auto)
0
0 to 100
%
P214
Start-up Period
Initial start speed hold period, prior control
loop taking over
0
0 to 100
secs
P215
Loop Refresh Period
Scan period for pump speed control loop
10
1 to 120
secs
P216
Maximum Control Pressure
Maximum pump speed control loop pressure
4.0
1.0 to 8.0
Bar
P217
DP Setpoint –Max Cooling
Mode
DP Setpoint used when operating in Max
Cooling mode
2.5
1 to 5.0
Bar
P216
Cooling Fan Run On Period
The period of time the fan will run on for after
the unit is switched to standby
10
0 to 60
mins
Fig.10 –Control System Configuration screen

CDU Operating & Maintenance Guide Page 17
Neptune DWC RM100 in-rack Coolant Distribution Unit
Configuration –Temperature Control
ID
Title
Description
Default
Range
Unit
P301
Temperature Setpoint
Set required Secondary temperature setpoint
18.0
10.0 to
55.0
°C
P302
Control Mode
Select from Fixed Setpoint or Fixed Setpoint
with Dewpoint Override
FSDO
FS, FSDO
-
P303
Dewpoint Offset
Minimum offset of setpoint from dewpoint
temp.
3.0
1.0 to 5.0
°C
P304
Ambient Offset
Minimum offset of setpoint from ambient temp.
3.0
-10 to 10
°C
P305
Sec. Low Temp Diff.
Low temp alarm offset below setpoint
2.0
1.0 to 10.0
°C
P306
Sec. High Temp Diff
High temp alarm offset above setpoint
2.0
1.0 to 10.0
°C
P307
Sec. Temp Reset Hysteresis
Low/High temp. alarm reset point
1.0
0.5 to 5.0
°C
P308
Sec. High Temp Setpoint DW
High temp alarm offset above setpoint when
dewpoint or ambient tracking
20.0
15.0 to
25.0
°C
P309
PID –Control Period
Scan period for control valve positioning
1
1 to 30
secs
P310
PID –Proportional Band
Proportional band
12.0
1.0 to 25.0
°C
P311
PID –Integral Reset
Integral reset time
18
0 to 999
secs
P312
PID –Derivative
Derivative reset time
5
0 to 999
secs
P313
Demand/Actual Error
Control valve demand to feedback error for
alarm
10
0 to 50
%
P314
Valve Check Period
Scan period for control valve position
monitoring
15
1 to 120
mins
P315
Valve Runtime
Control valve motor run time for control loop
40
10 to 180
secs
P316
Max Cooling Mode Temp
Setpoint
The temperature setpoint used when operating
in Max Cooling Mode
18.0
10.0 to
55.0
°C
Configuration –Primary
ID
Title
Description
Default
Range
Unit
P401
Pri. Flow Delay
Time delay prior to low flow alarm
15
1 to 120
mins
P402
Pri. Low Temp Setpoint
Low temp alarm threshold
4
2 to 40
°C
P403
Pri. High Temp Setpoint
High temp alarm threshold
11
6 to 60
°C
P404
Pri. Temp Reset Hysteresis
Low/High alarm reset from threshold
1
0.5 to 5.0
°C
Configuration –Filter
ID
Title
Description
Default
Range
Unit
P504
Sec. Filter Dirty Setpoint
Differential pressure alarm threshold for filter
dirty
0.2
0.2 to 1.0
Bar
P505
Sec. Filter Dirty Hysteresis
Alarm reset from threshold
0.1
0.1 to 0.5
Bar
P506
Sec. Filter Dirty Delay Period
Time delay prior to alarm
60
5 to 7200
secs
Configuration –Leak Detection
ID
Title
Description
Default
Range
Unit
P601
Leak Detection Operation -
Internal
Alarm only, or shutdown & alarm
Alarm
Alarm or
Alarm+S/D
-
P602
Internal Threshold
Set sensitivity of leak tape
50
1 to 85
kohms
P603
Internal Delay Period
Time delay prior to alarm
30
5 to 60
secs
P604
Leak Detection Operation –
Primary External
Alarm only, or shutdown & alarm
Alarm
Alarm or
Alarm+S/D
-
P607
Leak Detection Operation –
Secondary External
Alarm only, or shutdown & alarm
Alarm
Alarm or
Alarm+S/D
-
Configuration –Sensors
ID
Title
Description
Default
Range
Unit
P701
Secondary T2 Temperature
Differential
Alarm threshold T2a/b/c temperature differential
1
0.1 to 10
°C
P702
Secondary T2 Period
Time delay before T2a/b/c differential alarm
30
0 to 120
secs
P703
PS1 Scaling
Set measurement range. 0 = 0 to 30bar, 1 = 0
to 15bar, 2 = -1 to 8 bar.
2
0 to 2
-

CDU Operating & Maintenance Guide Page 18
Neptune DWC RM100 in-rack Coolant Distribution Unit
Configuration –Sensors (continued)
ID
Title
Description
Default
Range
Unit
P704
PS2 Scaling
Set measurement range. 0 = 0 to 30bar, 1 = 0
to 15bar, 2 = -1 to 8 bar.
2
0 to 2
-
P705
PS3 Scaling
Set measurement range. 0 = 0 to 30bar, 1 = 0
to 15bar, 2 = -1 to 8 bar.
2
0 to 2
-
P706
Thermistor Type
Set thermistor type
1
1
Configuration –Rotation
ID
Title
Description
Default
Range
Unit
P801
Frequency
Weekly
Daily,
Weekly,
Never
-
P802
Day of the Week
Monday
Sun. to
Sat.
-
P803
Time of Day –Hours
10
00 to 23
hrs
P804
Time of Day –Minutes
00
00 to 59
mins
Configuration –Miscellaneous
ID
Title
Description
Default
Range
Unit
P901
Manual Override Period
Time delay before controls revert to Auto
mode
15
1 to 120
mins
P902
Alarm Delay
Alarm suppression on start-up
20
1 to 120
mins
P903
Post Power Failure Options
Action to be taken following a power failure
once power is restored
Run
Run,
Standby
-
P904
Room RH&T Sensor
Remote RH&T sensor fitted
Yes
Yes –No
-
P905
Data Logging Interval
Set logging interval
0 = 60s
1 = 30s
2 = 10s
3 = 5s
0
0 to 3
-
P906
Temperature Alarm Delay
Time delay before temperature alarm
activates
10
0 to 1220
secs
2.2.9 SERVICE Screen
The Service screen (accessible only with Service & Engineer log-on codes) can be used to set ‘some’
parameters and to assist in commissioning.
NOTICE! The ‘Full Manual Control’option (Service ID’s shown in red text) will only be
accessible with the Engineer log-on code.
Fig.11 –Control System Service screen

CDU Operating & Maintenance Guide Page 19
Neptune DWC RM100 in-rack Coolant Distribution Unit
Service - Fill Pump Request
This fill function is used at commissioning
only and will allow the fill pump to run
without any time limit. Fill pump will still
switch Off automatically when unit reaches
required static pressure
Service - Rotation
Used to force a pump changeover at an
unscheduled time.
Service - Suppress Alarms
Resets the alarm delay timer (normally only
activated during start-up) to stop nuisance
alarms breaking through during manual
operation
Service - Overrides
ID
Title
Description
Default
Range
Unit
-
Pump 1 Speed
Set pump drive control speed
0
1 to 100
%
-
Pump 2 Speed
Set pump drive control speed
0
1 to 100
%
-
Fill Pump P3
Switch fill pump on
Auto
(1)
Auto (1) –
Man (0)
-
-
Cooling Valve
Set control valve position
0
1 to 100
%
-
Audible Alarm
Switch alarm output on or off
Auto
(1)
Auto (1) –
Man (0)
-
‘Overrides’ allows the user to manually control some functions of the unit for a limited time period while running in automatic
mode, for the purposes of troubleshooting etc. (see Installation & Commissioning manual for more information).
Service –Reset Run Hours
Resets the pump and valve run hours to zero.
Service –Full Manual Control
ID
Title
Description
Default
Range
Unit
-
Full Manual Control
Set unit to full manual control
0
0 to 1
-
Pump 1 Speed
Set pump drive control speed
0
1 to 100
%
-
Pump 2 Speed
Set pump drive control speed
0
1 to 100
%
-
Fill Pump P3
Switch fill pump on
Auto
(1)
Auto (1) –
Man (0)
-
-
Cooling Valve
Set control valve position
0
1 to 100
%
-
Audible Alarm
Switch alarm output on or off
Auto
(1)
Auto (1) –
Man (0)
-
-
Cooling Fan
Switch pump cooling fan on or off
Auto
(1)
Auto (1) –
Man (0)
-
Service –Max Cooling Mode
The function of this mode is to instantly
provide the maximum possible cooling in an
emergency situation

CDU Operating & Maintenance Guide Page 20
Neptune DWC RM100 in-rack Coolant Distribution Unit
2.2.10 DIAGNOSTICS Screen
This screen will give raw information and conversion factors for the status for all Universal Inputs,
Resistive Inputs, Digital Inputs, Digital Outputs, and Analogue Outputs.
I/O Diagnostics –Universal Inputs 1 to 8
ID
Description
ADC Value
Electrical
Processed
UI01
Secondary Flow Temp. T2a
0
0
Ohms
0.00
degC
UI02
Secondary Flow Temp. T2b
0
0
Ohms
0.00
degC
UI03
Secondary Flow Temp. T2c
0
0
Ohms
0.00
degC
UI04
Secondary Return Temp. T4
0
0
Ohms
0.00
degC
UI05
Secondary Return Pressure PS1
0
0.00
mA
0.00
bar
UI06
Pump Inlet Pressure PS2
0
0.00
mA
0.00
bar
UI07
Secondary Supply Pressure PS3
0
0.00
mA
0.00
bar
UI08
Room Sensor –RH
0
0.00
mA
0.00
%
I/O Diagnostics –Universal Inputs 9 to 14
ID
Description
ADC Value
Electrical
Processed
UI09
Ambient Sensor –Temperature T3
0
0.00
mA
0.00
degC
UI10
Primary Flow Temperature T1
0
0.00
mA
0.00
degC
UI11
Primary Flow Rate
0
0.00
mA
0
l/m
UI12
Secondary Flow Rate
0
0.00
mA
0
l/m
UI13
Control Valve Feedback
0
0.00
V
0.00
%
UI14
Primary Return Temperature T5
0
0
Ohms
0.00
degC
I/O Diagnostics –Resistive Inputs 1 to 4
ID
Description
ADC Value
Electrical
Processed
RI01
RI02
Leak Tape - CDU
0
0
Ohms
0
RI03
Leak Tape –External Primary
0
0
Ohms
0
RI04
Leak Tape –External Secondary
0
0
Ohms
0
I/O Diagnostics –Digital Inputs 1 to 6
ID
Description
State
DI01
Optical Level Sensor
0
DI02
Drive Status
0
DI03
DI04
DI05
DI06
I/O Diagnostics –Digital and Analogue Outputs
ID
Description
State
DO01
Fill Pump
0
DO03
Pump Cooling Fan
0
DO04
Alarm Output
0
AO04
Cooling Valve
%
Fig.12 –Control System Diagnostics screen