UNIPOWER Guardian Access 2U - MS28 DC Power Systems

The UNIPOWER Guardian Access 2U 180 Amp DC Power System is a 2RU high 19” rack-mounted, integrated DC power system providing an output of -48VDC. These systems can accommodate up to 3 Guardian family high efficiency hot-swap rectifiers. Alpine Power Systems is an approved distributor of UNIPOWER products. The UNIPOWER Guardian Access 2U - MS28 DC Power System has a 3 year warranty.

The UNIPOWER Guardian Access 2U 180 Amp DC Power System provides a total load current of 100A / 5.4kW is available with battery charge current up to 65A in addition. The rectifiers are internally fan cooled with speed control which is a function of load and temperature, keeping acoustic noise to a minimum.

The DC output circuits of the Guardian Access 2U 180 Amp DC Power System can provide up to 5 loads which utilize circuit breakers rated from 4A to 150A. 2 additional 80A, 100A or 125A breakers provide battery protection. A programmable 125A low voltage battery disconnect (LVD) is standard while a partial load disconnect (PLD), also rated at 125A and programmable, can provide non-critical load shedding when operating on batteries.

Guardian Access 2U | MS28 Features & Options:

• >96% Efficiency Rectifiers

• 180A / 8.7kW Load Capacity

• Remote Monitoring & Control

• Intelligent Battery Management

• Field Replaceable Controller

• Ethernet Comm. with SNMPv3

• 3 LED Alarm/Status Indicators

• Up to 10 Form-C Relay Alarms

• Up to 5 Load Breakers

• 2 Battery Breakers

• LCD Display/Touchpad

• Easy Installation

Guardian Access 2U | MS28 Output:

System Voltage: -48VDC nominal | -53.5 float (factory default setting, user adjustable)

Maximum Capacity @ 120VAC nominal:

• Load - 70A

• Battery - 70A discharge | 35A charge (s/w controlled)

Maximum Capacity @ 230/400VAC nominal      

• Load - 100A

• Battery - 100A discharge | 65A charge (s/w controlled)

No. Rectifier Slots: 3

 Guardian Access 2U | MS28 DC Distribution:

• Load Circuits: 5 x 18mm (4A to 150A)

• Battery Circuits: 2 x (80A, 100A or 125A)

Guardian Access 2U | MS28 Input:

Voltage (nominal):

• 1-phase 100-120/200-240VAC (L + N + PE)

• 3-phase 230/400VAC (L1 L2 L3 + N + PE)

Frequency: 47-63Hz

Maximum Input Current: 50A @ 100-120VAC | 39A @ 200-240VAC | 13A per phase @ 400/230VAC

Rectifier Power Factor: >0.98 (typical)

Surge Protection: Optional

Guardian Access 2U | MS28 Monitoring & Control (ACX Advanced Controller):

Alarm Relays: 4 standard, option for 10

Local Interface: 4 x 20 LCD, 4-key menu, USB / RS232, microSD card slot (4GB max,) for data logging

Remote Interface:

• Ethernet / Modem using PowCom software package

• Ethernet port allows monitoring and control over a TCP/IP network.

• Web browser support + SNMPv3

LED Indications:

• Green - System ON

• Yellow - Message(s)

• Red LED - Alarm(s)

External Digital I/O: 2 x Inputs, 2 x Outputs (TTL Level)

Guardian Access 2U | MS28 Battery Management:

Symmetry Inputs: 6 or 12 (can be redefined as analog inputs up to 100VDC)

Low Voltage Battery Disconnect (LVD): 1 x 125A Programmable

Partial Load Disconnect (LVD): 1 x 125A Programmable (Optional)

Temperature Compensated Charging: Programmable

Guardian Access 2U | MS28 Compliance:

EMC: EN 300 386 ; EN61000-6-3 (Emission) ; EN61000-6-2 (Immunity)

Safety: IEC60950-1:2005 2 Ed. +A1:2009

Guardian Access 2U | MS28 Environmental:

Operating Temperature: -40ºC to +55ºC

Storage Temperature: -40ºC to +85ºC

Guardian Access 2U | MS28 Dimensions, ins. (mm):

Standard Cover: 19.0 (483) W x 3.5 (88) H x 16.8 (428) D

Extended Cover:19.0 (483) W x 3.5 (88) H x 19.7 (500) D

Stock Models:

MS0028G*900010:

• ACX Controller

• 4 alarm relays

• 100A Battery Breaker (x2)

• Load Breakers: 63A/25A/25A/16A/16A

• 3m Temp. Sensor Cable (x1)

[Rectifiers & Dummy Modules must be ordered separately.]

MS0028G*900037

• ACX Controller

• 4 alarm relays

• 100A Battery Breaker (x2)

• Load Breakers: 40A/40A/20A/20A/10A

• 3m Temp. Sensor Cable (x1)

• 3m Symmetry Cable (x2)

[Rectifiers & Dummy Modules must be ordered separately.]

Guardian Access 2U | MS28 Intelligent Battery Management:

Battery Disconnection - Provides voltage controlled disconnection of batteries.

Boost Charging - Manual time controlled or automatic boost charging with adjustable time and voltage levels.

Battery Tests - Automatic or manual testing of batteries up to six times per year with a 10 test memory. Variables include test duration and end voltage. Battery discontinuance test to ensure battery connection.

Enhanced Battery Monitoring - Monthly logging of essential battery parameters including temperature, temperature hours, current, charging voltage and symmetry voltage, Data logged for 5 years.

Site Logs - System tools developed to assist site management. Daily peak load and statistic logs available.

Symmetry Measurement - Optional tool that measures batteries for early detection of thermal runaway.

Temperature Compensation Charging - Allows continuous adjustment of output voltage according to battery temperature. Features include adjustable compensation factor and separate thresholds for high temperature alarms.

Load Shedding (PLD) - Optional feature that allows voltage or time-controlled disconnection of non-essential load.

Alpine Power Systems is a value-added reseller of UNIPOWER products. Alpine can provide DC Power System services on all UNIPOWER products including engineering, installation, preventative maintenance, monitoring and recycling. Alpine provides services for data centers, telecom, healthcare, oil & gas and many other applications. Call our inside sales group at 877-993-8855 for assistance.