Delta Electronics MCS-1800 User manual

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DELTA MCS-1800 Power Shelf
Installation, Operation and
Maintenance Manual

Delta MCS 1800 3U
Power Shelf
Installation, Operations and
Maintenance Manual
DELTA ELECTRONICS, INC.

DELTA MCS 1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
INDEX i
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1. General ---------------------------------------------- 1-1
1.1 Using This Manual ---------------------------------------------- 1-1
1.2 Safety Notice ---------------------------------------------- 1-1
2. Product Description ---------------------------------------------- 2-1
2.1 Product Description ---------------------------------------------- 2-1
2.2 Product Main Features ---------------------------------------------- 2-1
2.3 System Specifications ---------------------------------------------- 2-1
3. Power Supply Unit (PSU) ---------------------------------------------- 3-1
3.1 Description ---------------------------------------------- 3-1
3.2 Specifications ---------------------------------------------- 3-1
3.3 Operation and Adjustment ---------------------------------------------- 3-4
3.4 System Alarm ---------------------------------------------- 3-5
3.5 PSU Block Diagram ---------------------------------------------- 3-5
3.6 PSU Operating Principle ---------------------------------------------- 3-5
4. Alarm Control Unit ---------------------------------------------- 4-1
4.1 Description ---------------------------------------------- 4-1
4.2 Specifications ---------------------------------------------- 4-1
4.3 Alarm Control Unit Block Diagram ---------------------------------------------- 4-4
4.4 Settings and Control ---------------------------------------------- 4-4
5. DC Distribution ---------------------------------------------- 5-1
5.1 DC Cabling ---------------------------------------------- 5-1
5.2 Low Voltage Battery Disconnect (System
equipped with PDU) ---------------------------------------------- 5-1
5.3 Battery Connections (System equipped with
PDU) ---------------------------------------------- 5-1
5.4 Battery Temperature Probe Connection (System
equipped with PDU) ---------------------------------------------- 5-1
6. Installation ---------------------------------------------- 6-1
6.1 Preliminary Inspection ---------------------------------------------- 6-1
6.2 System Mounting ---------------------------------------------- 6-1
6.3 Module Installation ---------------------------------------------- 6-1
6.4 Shelf Wiring ---------------------------------------------- 6-1
6.5 AC Input Connections ---------------------------------------------- 6-1

DELTA MCS 1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
INDEX ii
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6.6 Battery String Connections (System equipped
with PDU) ---------------------------------------------- 6-1
6.7 Temperature and Alarm Connections ---------------------------------------------- 6-2
6.8 EXT. Breaker trip signal I/P Connector Wiring ---------------------------------------------- 6-2
6.9 AC High Voltage Aux. RelayOutput Wiring---------------------------------------------- 6-2
7. System Start –Up Procedure ---------------------------------------------- 7-1
7.1 Initial Start-Up Preparation ---------------------------------------------- 7-1
7.3 Basic Functional Verification 7.2 No Load
Start-Up ---------------------------------------------- 7-1
7.4 DC Load Connections ---------------------------------------------- 7-1
7.5 System Functionality Check ---------------------------------------------- 7-1
7.6 System Operation ---------------------------------------------- 7-1
8. System Alarms and Troubleshooting ---------------------------------------------- 8-1
8.1 AC Fail Voltage Alarm Description ---------------------------------------------- 8-1
8.2 High Voltage Shutdown Alarm ---------------------------------------------- 8-1
8.3 High Voltage Alarm Description ---------------------------------------------- 8-1
8.4 Low Voltage Alarm ---------------------------------------------- 8-2
8.5 Low Voltage Disconnect Alarm (System
equipped with PDU) ---------------------------------------------- 8-2
8.6 Fuse Fail Alarm (System equipped with PDU) ---------------------------------------------- 8-2
8.7 Alarm Unit Fail ---------------------------------------------- 8-3
8.8 Rectifier Fail Alarm ---------------------------------------------- 8-3
9. Maintenance ---------------------------------------------- 9-1
9.1 Cleaning and Maintenance ---------------------------------------------- 9-1
9.2 Removing and Replacing a Rectifier Unit ---------------------------------------------- 9-1
10. Acronyms and Abbreviations ---------------------------------------------- 10-1 ~3
ATTACHMENT

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
1-1
1 General
1.1 Using This Manual
This manual contains specifications and instructions to properly install and maintain the power supply system.
Component specifications and drawings are also included.
This manual contains information related to the operation and maintenance of the Alarm Control Unit (ALU),
the –48V/+24V Power Supply Unit (PSU), and the Distribution Module. Additional information is provided
on system status and alarms, troubleshooting, and system maintenance. Appendix figures of this manual
contains drawings, simple block diagram for different functional blocks and systems schematic.
Step-by-step procedures required for the installation and turn-up are detailed. All equipment parameter
setting, adjustments, and confirmation, as well as system monitoring, operations, and maintenance procedures,
are included.
Warnings are printed in bold, italic lettering. They alert the installation or maintenance craftsperson of a
potential hazard to either the equipment or the craftsperson if the warning is not followed.
1.2 Safety Notice
Delta Energy Systems is not liable for any hazards incurred by not following proper safety procedures.
Installation, operation, and maintenance personnel should always follow these safety rules:
1. Before installing the system, verify the AC input voltage and frequency, the AC breaker rating and type,
and other environmental conditions as noted in the specifications.
2. The system has passed stringent system testing prior to shipment. To avoid electrical shock. The
rectifier system requires a single ground point permanently connected to earth ground.
3. An AC breaker must provide adequate isolation between the system input and commercial AC main.
4. The environment should be dust free and controlled by an AC system. The area must be free of any
flammable vapors or fluids.
5. To avoid electrical hazard, the covers must not be removed on any component, including the ALU and
the rectifier.
6. Circuit breakers or fuses must be replaced with approved replacement circuit breakers meeting the
original design specification.
7. All connections must be made per the latest issue of the applicable national and local codes.

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
2-1
2 Product Description
2.1 Product Description
This power Shelf consists of modular rectifiers, an Alarm Control Unit (ALU), and a DC distribution
module. Up to four rectifiers and an alarm unit can be equipped on a shelf containing an integrated distribution
module. The rectifiers can operate from a universal range of AC line voltages. The High Line (HL)
operations are defined at an AC line input range of 165VAC~ 264VAC. The Low Line (LL) operations are
defined at an AC line input range of 90 VAC-130 VAC.
The system is controlled and monitored by the ALU. System level rectifier voltage settings, system
status, and alarms are displayed on the ALU. The system float voltage, equalize voltage, and alarm thresholds
are set from RMS. The ALU also provides automatic derating of the output power over the whole operating
line voltages. Figure 1 shows different functional blocks of the system.
2.2 Product Main Features
The Power Shelf has the following main features:
 -48 VDC/120 Amps, or +24VDC/200Amps, N+1 redundancy
 Modular design for scalable, cost effective expansion
 Front access for simple installation and maintenance
 High power density
 Active Power Factor Correction (>. 99PFC)
 High efficiency
 Temperature compensated float voltage control
 Alarm Control Unit
 Low Voltage Battery Disconnect (LVBD) (System equipped with PDU)
 Remote Monitoring and control
2.3 System Specifications
The system specifications are provided in the following sections.
2.3.1 -48V Standard Power Shelf Configuration(MODUL NAME: ES48/120-JAAxx)
(1) AC Input: 175VAC ~ 275VAC, 48Amps. Max
(2) System Capacity: 120Amps. Max.
(3) Rectifier: -48V/30A×1~4
(4) Control and Supervisory Unit
Figure 1 shows a front view of shelf.

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
2-2
Environmental Data
System Environmental Data
Specification Value
Operating temperature 0℃to +50℃
Storage temperature -40℃to +70℃
Humidity 0% to 95% RH
Altitude -300 ft. to 10,000 ft.
Weight Approximately 48 lbs.
EMI/FRI FCC Part 15, Class B and CISPR 22, Class B
Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5
Seismic Bellcore GR-63-CORE, Zone 4
Safety CUL and UL Listed and Marked
2.3.2 +24V Standard Power Shelf Configuration(MODUL NAME: ES24/200-JAAxx)
(1) AC Input: 175VAC ~ 275VAC, 48Amps. Max
(2) System Capacity: 200Amps. Max.
(3) Rectifier: +24V/50A×1~4
(4) Control and Supervisory
Figure 1 shows a front view of shelf.
Environmental Data
System Environmental Data
Specification Value
Operating temperature 0℃to +50℃
Storage temperature -40℃to +70℃
Humidity 0% to 95% RH
Altitude -300 ft. to 10,000 ft.
Weight Approximately 48 lbs.
Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5
Seismic Bellcore GR-63-CORE, Zone 4
Safety CUL and UL Listed and Marked
2.3.3 -48V System with Power Distribution and Rectifiers(MODUL NAME: ES48/90-JBAxx)
(1) AC Input: 175VAC ~ 275VAC, 36Amps. Max
(2) System Capacity: 90Amps. Max.
(3) Rectifier: -48V/30A×1~3
(4) Control and Supervisory
(5) Load Distribution: 30A Breaker×5 @ Single Pole
(6) Low Voltage Disconnect Switch: 100A×1 @ Single Pole at Battery Side
(7) Battery Breaker: 100A×1
(8) AC Breaker

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
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Figure 1-1 shows a front view of shelf.
Environmental Data
System Environmental Data
Specification Value
Operating temperature 0℃to +50℃
Storage temperature -40℃to +70℃
Humidity 0% to 95% RH
Altitude -300 ft. to 10,000 ft.
Weight Approximately 48 lbs.
Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5
Seismic Bellcore GR-63-CORE, Zone 4
2.3.4 -48V System with Power Distribution and Rectifiers(MODUL NAME: ES48/90-JFAxx)
(1) AC Input: 175VAC ~ 275VAC, 36Amps. Max
(2) System Capacity: 90Amps. Max.
(3) Rectifier: -48V/30A×1~3
(4) Control and Supervisory
(5) Load Distribution: 100A Breaker×4 @ Single Pole
(6) Low Voltage Disconnect Switch: 100A×1 @ Single Pole at Battery Side
Figure 1-1 shows a front view of shelf.
Environmental Data
System Environmental Data
Specification Value
Operating temperature 0℃to +50℃
Storage temperature -40℃to +70℃
Humidity 0% to 95% RH
Altitude -300 ft. to 10,000 ft.
Weight Approximately 48 lbs.
EMI/FRI FCC Part 15, Class B and CISPR 22, Class B
Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5
Seismic Bellcore GR-63-CORE, Zone 4
Safety CUL and UL Listed and Marked
2.4 Electrical Data
The system electrical data is provided in the following tables.
2.4.1 Input

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
2-4
Table 1 displays the system input specifications.
Table 1 System Input Specifications
Specification Value
Nominal range 175 ~ 275VAC
Operational range
90 ~ 275VAC Full Load
150V ~ 175Vac de-rating to 80% Load
90V ~ 150Vac de-rating to 50% Load
50℃~ 65℃de-rating 1500W
Frequency 45 ~ 65Hz
Power Factor >0.99 @ 220VAC, Full Load
THD <5% @ 220VAC, Full Load
Efficiency >90% @ 220VAC, Full Load
2.4.2 Output
Table 2 displays the system output specifications.
Table 2 System Output Specifications
Specification Value
DC Volts 38~60 VDC (-48V Version)
20~30 VDC (+24V Version)
Load regulation <1%
Line regulation <0.2%
Current Limit 110%
Current share <5%
Noise:
Audio band
Wide band
Acoustic
<2mv
<10 mVrms
<55 dBA
2.4.3 Status/Alarm Indicators
The Power Shelf has the following status/alarm indicators:
 Load Current
 AC ON
 Rectifier Fail Alarm (RFA)
 Current Limit (CL)
 Float/Equalize (FL/EQU)
 Major Alarm (MAJ)
 Minor Alarm (MIN)
 High Voltage Alarm (HV)
 High Voltage Shutdown (HVSD)
 Low Voltage Alarm (LV)
 Low Voltage Disconnect Open (LVDS OPEN)
 Fuse Blown (FUSE ALM)
 AC Fail (AC FAIL)

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Installation, Operations and
Maintenance Manual
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2.4.4 Mechanical Data
Dimension Value
Height 5.2 in. (132mm)
Depth 10.35 in. (263mm)
Width 3.3 in. (83.6mm)

DELTA MCS-1800 3U Power Sh elf
Installation, Operations and
Maintenance Manual
3-1
3 Power Supply Unit (PSU)
3.1 Description
This rectifier units are rated at full load when operated from high line. For Low operation, the output is
derated to half load. This derating is automatically activated from the Alarm Control Unit (ALU). However,
the rectifier can operate on a stand-alone basis, if this ALU is removed or nonfunctional.
Warning: In the absence of the ALU, the automatic derating of the rectifiers at Low Line is not effective.
Exceeding the 50% load limit at Low Line may damage the rectifiers.
The modular design provides the flexibility to configure and expand the system as the load demand
increases. Each rectifier unit is swappable with front access for ease of maintenance without system shutdown,
providing uninterrupted service.
The rectifier unit has an active power factor correction of greater than 0.99 for maximum AC utilization.
Each module is equipped with an AC switch located at the front of the module. Figure 3 shows a front view of
PSU.
Note: The equipment is only for installation in a Restricted Access Location.
The equipment is used on a stationary equipment/unit only.
3.2 Specifications
Detailed rectifier specifications are provided in the following sections.
3.2.1 Electrical
Detailed electrical specifications for the rectifier are provided in this section.
3.2.1.1 Input
Table 6 displays the rectifier input specifications.
Table 6 Rectifier Input Specifications
Specification Value
Input Voltage 90VAC to 275VAC, Single Phase, (during 176 to 150VAC
derated to 80% Load, during 150 to 90VAC derated to 50% Load)
Input Current 12 Amps at 176 VAC, Full Load
Line Frequency 45 to 65 Hz
Power Factor >0.99, at 220 VAC Input, Full Load
THD <5%, at 220 VAC Input, Full Load
Efficiency >90%, Full Load (-48V Version)
>88%, Full Load (+24V Version)
Inrush Current <12 Amps (peak), 220 VAC, Full Load, Cold Start
Start Time Delay
(Walk-In) 3 to 10 seconds
Protection Fuse

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Installation, Operations and
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3.2.1.2 Output
Table 7 displays the rectifier output specifications.
Table 7 Rectifier Output Specifications
Specification Value
DC Output Voltage
40 to 60VDC [factory preset at –54.3VDC, 30Amps (HL) /
15Amps (LL)] –48V Version
20 to 30VDC [factory preset at 27.2VDC, 50Amps (HL) /
25Amps (LL)] +24V Version
Output Power 1800W Maximum (-48V Version)
1500W Maximum (+24V Version)
Regulation:
Load
Line
<1% (Load 0 to 100%)
<0.1%
Current Limit 110% Max. of Rated Output Current
Noise:
Audio Band
Wide Band
Acoustic
<2mV
<20 mVrms (10 KHz to 100 MHz)
<55 dBA @ 1M
Current Sharing <5% of Rated Output Current
Dynamic Response 10% to 90% Load Change Overshoot ≤5% Rated Output
Voltage Recovery Time <1 ms to ≤1% Rated Output Voltage
Protection Fuse
3.2.1.3 Protection
Table 8 displays the protection specifications.
Table 8 Protection Specifications
Condition Response
High Output Voltage (Exceeds
Preset Value) Automatic Shutdown and Latch
Over Current/Output Short Automatic Shutdown and Recovery
Over Temperature Automatic Shutdown and Recovery
Brownout No Damage
AC Input Voltage High Automatic Shutdown and Recovery
AC Input Voltage Low Automatic Shutdown and Recovery

DELTA MCS-1800 3U Power Sh elf
Installation, Operations and
Maintenance Manual
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3.2.1.4 Adjustments
Table 9 displays the adjustments.
Table 9 Adjustments
Adjustment Description
Test Points (I+,I-) Current
Float Voltage (FLO) Variable Resistor or Setting on ALU
Current Limit (CL) Variable Resistor or Setting on ALU
3.2.2 Environmental
Table 10 displays the environmental specifications.
Table 10 Environmental Specifications
Specification Value
Operating temperature 32 to +122℉(0℃to +50℃) OPTION
Storage temperature -40 to +185℉(-40℃to +85℃)
Humidity 0% to 95% Relative Humidity No condensing
Altitude -5.2”/132mm
Weight 3.3 Kg (7.26 lbs.)
EMI/FRI suppression Conforms to EN 55022, BS 6527 FCC Part 15 Subpart J,
and CISPR 22 Class A
Current harmonic Conforms to EN 61000-3-2/A12, EN 60555-2, IEC
1000-3-2 Class A
Voltage fluctuation Conforms to EN 61000-3-3M, EN 60555-3
Electrostatic discharge Conforms to EN 61000-4-2, IEC 1000-4-2, IEC 801-2
Level 4
Radiated susceptibility Conforms to IEC 1000-4-3, IEC 801-3 Level 3
Electrical fast transients Conforms to EN 61000-4-4, IEC 1000-4-4, IEC 801-4
Level 4
Conducted susceptibility Conforms to IEC 1000-4-6 Level 3
Lightning/surge Conforms to ANS/IEEE C62.41.-1, 1991 B3, IEC
1000-4-5 Level Special (6KV)
Safety Meets IEC 950, EN60950, UL/CUL/CE Approval
MTBF >150 K hours
Cooling Fan cooling
Heat dissipation 682 BTU/hour max. per module (-48V Version)
698 BTU/hour max. per module (+24V Version)

DELTA MCS-1800 3U Power Sh elf
Installation, Operations and
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3.2.3 Status/Alarm Indicators
Table 11 displays the status alarm indicators
Table 11 Status Alarm Indicators
Indicator Color Function Description
LED Amber CL Current Limit
LED Green AC AC ON
LED Red RFA Rectifier Failure Alarm
3.2.4 Mechanical Data
Table 12 displays the rectifier mechanical data.
Table 12 Rectifier Mechanical Data
3.3 Operation and Adjustment
All operating adjustments are made at the front panel of each rectifier. The following components are
located on each rectifier panel:
1. Float voltage adjustment
2. Current limit adjustment
3. Current test points
4. Alarm indicators
Figure 3 shows different indicators and adjustment points on this unit.
Rectifier adjustments must be done sequentially from the first through the fourth rectifier with AC applied.
All adjustments must be made with no load, and the batteries disconnected to ensure adjustment accuracy.
3.3.1 Start-Up
To start up the system, perform the following steps:
1. Aproximately 3 to 8 seconds after the AC applied, the RFA LED extinguishes.
3.3.2 Float Voltage Adjustment
Verify the required float voltage setting per battery manufacturer specification. If the factory setting differs
from the battery manufacturer recommended setting, the ALU float voltage parameter and each rectifier’s
float voltage must be adjusted to the new setting. A digital multimeter and a small screwdriver are required
to perform this procedure. Located the float voltage access point (FL) at the front of the rectifier.
To adjust the float voltage, perform the following steps:
1. Remove the ALU.
Dimension Value
Height 5.2 in. (132mm)
Depth 10.35 in. (263mm)
Width 3.3 in. (83.6mm)

DELTA MCS-1800 3U Power Sh elf
Installation, Operations and
Maintenance Manual
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2. Place the digital multimeter probe in the V+ and V- output voltage connecter.
3. Adjust the float voltage by using a screwdriver to turn the FL point to the voltage value as shown on
the meter. The tolerance error should not exceed 0.02V.
Notes:
1. Turning the variable resistor adjustment point clockwise increases the value, and counterclockwise
2. Refer to Figure 3 (rectifier front view) for the location of V+, V- and FL point.
3. When the setting is completed, temperature and voltage compensation must be reset to the default
value.
3.3.3 Current Limit Setting
Warning: Current limit setting is not intended to be adjusted in the field. Users should only use it for
their reference.
Current limit adjustment is made by turning the CL variable resistor with the digital multimeter probes
in the I+, I- test points. This current limit is set at the factory. The factory setting is always the
maximum value of 110%. For a 48V/30 Amp rectifier, the computation for the current limit is
1.1×30=33 Amps.
The following adjustment procedure is for reference only:
1. At the rectifier, place the digital multimeter probes in the I+, I- test points.
2. Place a small screwdriver in the CL adjustment point.
3. Turn the variable resistor counterclockwise to increase the value. Turn the variable resistor
clockwise to decrease the current limit value.
3.4 System Alarm
During an alarm condition, the faulty rectifier illuminates its RFA light on the front panel. The rectifier
fail alarm signal is sent to the ALU, which processes the alarm, closes the RFA alarm contacts, and lights the
alarm LEDs.
3.5 PSU Block Diagram
Refer to Figure 5.
3.6 PSU Operating Principle
After applying the incoming line voltage to the rectifier, current is applied to the EMI filter and circulates
through protection components such as the AC circuit breaker and the fuse. The major functions of the
protection devices are to prevent the rectifier from being damaged by surge voltage, to efficiently reduce the
noise of differential mode and common mode, to eliminate the high frequency noise from input current, and to
prevent noise reverse to the source circuit.
The AC input voltage is rectified and converted to a 400VDC bus through a PFC boost stage. This PFC
stage maintains the Power Factor at >.99 and the Total Harmonic Distortion (THD) at <5%.
The 400 VDC bus voltages is modulated at a frequency higher than 100KHz and stepped down through a
transformer. Output of this transformer is rectified and filtered to provide the output DC voltage.

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
4-1
4 Alarm Control Unit
4.1 Description
The Alarm Control Unit (ALU) with RS232 & LAN interface and remote monitoring function provides
output alarms, alarm threshold adjustments, float and equalize voltage adjustments, temperature compensation
voltage settings, low voltage disconnect voltage threshold settings, an equalize charge timer, and system alarm
LEDs. In addition, the ALU automatically derates the system output current according to the following table:
Figure 2 shows a front view of Alarm control unit.
Table 13 Voltage Ranges
Input Voltage Range Output
90-150 VAC 50%
150-175 VAC 80%
176-275 VAC 100%
The module is hot swappable.
4.2 Specifications
4.2.1 Input Characteristics
Table 14 displays the input characteristics.
Table 14 Input Characteristics
Characteristic Value
Input Voltage Range 40V to 59.5V for 48V system
20V to 30V for 24V system
Input Current <0.5 Amps
4.2.2 Push Buttons
This alarm unit has 3 push buttons on the front panel. These push buttons are used to control the
alarm unit. Following are possible functions these buttons will act:
Control
- FL/EQU
- HVSD RST
- SMR RST
- Voltage/Current Display

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
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Settings Description
FL/EQU
- Function - This button is used to manually select SMR into float or equalize state.
HVSD RST
- Function - When SMRs shut down resulting from DC high voltage. This button is
used to reset alarm state.
SMR RST
- Function System will detect RFA warning when SMRs are vacant or turned off.
However, if the button is pushed at this time, the system will stop
sending the warning.
Voltage/Current
- Function This button is used to change the voltage or current of LED display.
Notice: When SMR turn off , the system will detect RFA warning in ES48/90-JFAxx.
When SMR vacant , the system will detect RFA warning in other system.
4.2.3 Indicators
Table 15 displays the ALU indicators.
Table 15 ALU Indicators
Indicator Color Function Description
LED1 Green FL System Float State
LED2 Yellow EQU System Equalize State
LED3 Red HV DC High Voltage Alarm-Minor
LED4 Red LV DC Low Voltage Alarm-Minor
LED5 Yellow MIN System Minor Alarm
LED6 Red MAJ System Major Alarm
LED7 Red HVSD High Voltage Shutdown (DC)
LED8 Red AC FAIL Loss of AC Input
LED9 Red FUSE ALM DC Output or Breaker SW. Trip
LED10 Red LVDS OPEN Low Voltage Disconnect Open
4.2.4 Relay Output
Table 16 displays the relay output.(Please refer to Figure 5)
Table 16 Relay Output
Relay Function Description Relay Function Description
Relay1 ACF AC Failure Relay5 LV DC Low Voltage
Alarm-Minor
Relay2 MAJ Major Alarm Relay6 LVD Low Voltage Disconnect
Open
Relay3 HVSD High Voltage Shutdown Relay7 FA Breaker Trip
Alarm
Relay4 HV DC High Voltage
Alarm-Minor Relay8 MIN Minor Alarm

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4.2.5 ALU Alarm Signal Descriptions
MAJ: Major Alarm
(1) 2 or above rectifiers fail.
(2) Temperature sensor disconnects.
(3) AC Low Voltage Alarm.
(4) AC High Voltage Alarm.
(5) LVDS Trip Alarm. (System equipped with PDU)
(6) Battery or Ambient over temperature. (System equipped with PDU)
(7) HVSD Alarm.
(8) Breaker Trip Alarm.
MIN: Minor Alarm
(1) One rectifier fail.
(2) Current Limit Alarm.
(3) DC High Voltage Alarm.
(4) DC Low Voltage Alarm.
HV: The alarm condition exists when the DC output voltage is higher than the parameter setting.
LV: The alarm condition exists when the DC output voltage is lower than the parameter setting.
AC Fail: The alarm condition exists when the AC voltage is absent.
LVDS: The alarm condition exists when the DC output voltage is lower than the threshold voltage.
(System equipped with PDU)
Fuse Fail: The alarm condition exists when the battery switch trip off or the DC Load output switch trip off.
4.2.6 Physical
Table 18 displays the ALU mechanical data.
Table 18 ALU Mechanical Data
Dimension Value
Height 5.2 in. (132mm)
Depth 9.9 in. (251.3mm)
Width 1.9 in. (46.2mm)

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4.2.7 Environmental
Table 19 displays the environmental specifications.
Table 19 Environmental Specifications
Specification Value
Operating temperature 32℉to +122℉(0℃to +50℃)
Storage temperature -40℉to +185℉(-40℃to +85℃)
Humidity 0% to 95% Relative Humidity No condensing
Altitude -500 to 10,000 ft.
Weight 2.64 lbs. (1.2Kg)
ESD IEC 1000-4-2 (Contact 4KV Air 8KV)
4.2.8 Remote monitoring and control
The ALU provide the flowing remote monitoring methods.
1. Use RS232 Interface.
2. Use Internet Web server function (RJ45)-(Optional)
4.2.10 Parameter Modify
Enter the Remote monitoring software or use the internet Brower to modify the parameter.
4.3 Alarm Control Unit Block Diagram
Refer to Figure 7.
4.4. Settings and Control
Settings:
Settings Description Comment
DC High Voltage Shutdown
Function
Default
Recovery
Steps
- High voltage shutdown threshold adjustment
- 58.5VDC (-48V System)
- 29.5VDC (+24V System)
- 57.5VDC (-48V System)
- 28.5VDC (+24V System)
- 0.1VDC
DC High Voltage Alarm
Function
Default
Recovery
Steps
- High voltage alarm threshold adjustment
- 57.5VDC (-48V System)
- 29VDC (+24V System)
- 56.5VDC (-48V System)
- 28VDC (+24V System)
- 0.1VDC
DC Low Voltage Alarm
Function
Default
Recovery
- Low voltage alarm threshold adjustment
- 44.0VDC (-48V System)
- 23VDC (+24V System)
- 45.0VDC (-48V System)
- 24VDC (+24V System)

DELTA MCS-1800 3U Power Shelf
Installation, Operations and
Maintenance Manual
4-5
Settings Description Comment
Steps - 0.1VDC
AC High Voltage Alarm
Function
Default
Recovery
Steps
- AC high voltage alarm threshold adjustment
- 264V
- 261V
- 1V
AC Low Voltage Alarm
Function
Default
Recovery
Steps
- AC Low voltage alarm threshold adjustment
- 176V
- 179V
- 1V
Temperature Alarm
Function
Default
Steps
- Battery Temperature alarm
- 104℉(40℃)
- 1℃
Site ID
Function
Setting
- Set identification number for this site
- 4 digits and number range is 0-9
Floating / Equalize charging
voltage
Function - Float / Equalize charging voltage
Default - Float
- 54.3VDC (-48V System)
- 27.2VDC (+24V System)
- EQUALIZE
- 56.4VDC (-48V System)
- 28.2VDC (+24V System)
Steps - 0.1V
LVDS Trip Voltage
Function - Sets LVDS trip voltage
Default - 42VDC (-48V System)
- 22VDC (+24V System)
Recovery - When one rectifier work normally and not in the
CL Mode
Steps - 0.1V
Compensation On/Off
Function - Enable / Disable Temperature Compensation
feature
Setting
Default
- ON/OFF
- On
Compensation Volt. Range
Function
Default
Steps
- To set Temperature Compensation Voltage
- -1.3VDC~+1.3VDC (-48V System)
- -0.7VDC~+0.7VDC (+24V System)
- 0.1V
Equalize Duration Time
Function - To set the duration of equalizes charging after
AC recovery. This setting is active when battery
deeply discharge resulting from AC fail.
Default
Steps
- 1-10 hours
- 1 hour
Mains Recovery Charging
Current Limited
- When mains recovery to avoid the charging
current too large, CSU will limit the charging
current.
- [ (IL+ Max. Cap.) / Parameter] / available SMR