600 amp dc power system

Product Information

Guardian Access M38 is a 5-7RU high 19” rack-mounted, integrated 600 Amp DC power system providing an output of -48VDC. These highly configurable systems incorporate 3 rectifier shelves with up to 11 Guardian family high efficiency hot-swap rectifiers.

Guardian Access M38 provides a maximum total current of 600A (N+1). This may be shared between the load and battery charge current, the latter being programmable via the controller. 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 distribution module in Guardian Access M38 can accommodate up to 20 pluggable breakers or TPS fuse modules. 4 or 8 of these in each case may be connected to the bus via the Low Voltage Battery Disconnect (LVBD).


Features and Options
  • >96% Efficiency Rectifiers
  • 60A to 600A (N+1) Capacity
  • Remote Monitoring & Control
  • Field Replaceable Controller
  • Ethernet Comm. with SNMPv3
  • 3 LED Alarm/Status Indicators
  • 10 Form-C Relay Alarms
  • Up to 20 Load Circuits
  • 600A LVBD Standard
  • LCD Display/Touchpad
  • Easy Installation
System Voltage-48VDC nominal | -53.5 float (factory default setting, user adjustable)
Maximum Capacity Load - 600A
Battery - 600A discharge | s/w controlled charge
No. Rectifier Slots 3 to 11
Load Circuits Up to 20 (3A to 100A one position, 125A or 200A two position)
Battery Circuits 0, 4 or 8 x (100A one position, 125A two position or 200A two position)
Voltage (nominal)1-phase 200-240VAC (L + N + PE)
Maximum Input Current 17A per rectifier
Rectifier Power Factor>0.98 (typical)
MONITORING & CONTROL (ACX Advanced Controller)
Alarm Relays 10 standard
Local Interface 4 x 20 LCD, 4-key menu, USB / RS232, microSD card slot (4GB max,) for data logging
Remote InterfaceEthernet / Modem using PowCom™ software package
Ethernet port allows monitoring and control over a TCP/IP network.
Web browser support + SNMPv3
LED IndicationsGreen - System ON; Yellow - Message(s); Red LED - Alarm(s)
External Digital I/O 2 x Inputs, 2 x Outputs (TTL Level)
Symmetry Inputs6 or 12 (can be redefined as analog inputs up to 100VDC)
Low Voltage Battery Disconnect (LVBD) 1 x 600A Programmable
Temperature Compensated ChargingProgrammable
EMCEN 300 386 ; EN61000-6-3 (Emission) ; EN61000-6-2 (Immunity)
SafetyCAN/CSA C22.2 No 62368-1:2014
UL 62368-1:2014
EN 62368-1:2014/A11:2017
Operating Temperature-40ºC to +55ºC
Storage Temperature-40ºC to +85ºC
DIMENSIONS, ins. (mm)
Width 19.0 (483)
Height 5RU, 6RU or 7RU
Depth 21.6 (548) overall | 14.0 (255) behind mounting plane
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.