EXPANDABLE 24 VDC POWER SUPPLY N+1 DC Power System with Battery Backup / Charging Function MODELS : SEC-2430BRM SEC-2440BRM SEC-2450BRM INSTALLATION & OPERATING MANUAL Please read this manual before operating your power supply.
• PROVIDES N + 1 REDUNDANCY • ALLOWS CONNECTION OF EXTERNAL BATTERIES FOR BACKUP • EXPAND OUTPUT POWER BY ADDING POWER MODULES • UP TO 50 AMPS CONTINUOUS POWER • VOLT / AMPERE METER • OPERATION STATUS L.E.D. • FAN FAILURE ALARM AND WARNING L.E.D.
TABLE OF CONTENTS Topic Page Important safety instructions 1,2 Description and application 3 Design and principle of operation 3 Cooling and warning for fan failure 3 Front panel controls and indicators 4 Rear panel controls 4,5 Protections 5 Installation and operation 6 Operation of battery back-up 7 Output voltage adjustment 8,9 Installation and removal of modules 9,10 Trouble shooting 11,12 Limiting electromagnetic interference 13,14,15 Specifications 16 Appendix : 17,18 F
IMPORTANT SAFETY INSTRUCTIONS Please read before using your power supply. CAUTION ! ALL ELECTRICAL INSTALLATIONS MUST MEET LOCAL AND NATIONAL WIRING CODES AND SHOULD BE PERFORMED BY A QUALIFIED ELECTRICIAN. OPERATION OF COOLING FAN THE HEAT PRODUCED IS EXTRACTED BY FORCED AIR COOLING. IN CASE ANY OF THE FANS FAILS, LIGHT AND SOUND ALARMS WILL BE ACTIVATED.
LOAD AND BATTERY CONNECTIONS THE LOAD & BATTERY TERMINALS ON THE POWER SUPPLY HAVE A TUBULAR HOLE OF DIAMETER 8mm (0.31”) WITH A SET SCREW. ALWAYS ENSURE THAT THE CONNECTIONS ARE SECURE AND THE SCREWS ARE TIGHTENED PROPERLY. LOOSELY TIGHTENED CONNECTIONS RESULT IN EXCESSIVE VOLTAGE DROP AND MAY CAUSE OVERHEATED WIRES AND MELTED INSULATION. THE ENDS OF THE CABLES TO BE CONNECTED TO THE LOAD AND BATTERY TERMINALS ON THE POWER SUPPLY SHOULD HAVE PIN TYPE OF CONNECTOR FOR MAKING A FIRM CONNCECTON.
DESCRIPTION This is a 19 inch Rack Mount Power Supply which converts 120 V , 60 Hz. AC power into regulated 28 V DC , +/- 1% (At module output*) delivering up to a maximum of 50 A continuous ( up to 57.5 A surge ) with 5 Base Level PCB Modules. There is provision to connect the power supply to an external battery for backup power in the case of an AC power failure and re-charge the battery when AC power resumes. *Voltage at output terminals Load+ & Load-will be 27.
A warning circuit monitors the operational condition of the fans. In case of a fan failure, a buzzer will sound and the red LED indicating “TEMP. FAULT” will light up. The unit should be switched off immediately and the defective fan should be replaced. NEVER LOAD THE UNIT WHEN THERE IS AN AUDIBLE ALARM AND THE TEMP. FAULT LED IS ILLUMINATED. FRONT PANEL CONTROLS AND INDICATORS The following controls and indicators are provided on the front panel : 1. POWER ON/OFF SWITCH / BREAKER.
3. REMOTE MONITORING AND INDICATIONS . A 25 pin D-sub connector has been provided for remote monitoring and indication. Pin connections are given below. Pins 2 and 16 are meant to indicate availability of input AC power. Current indication on pins 18 & 6 is 0.5mV per Amp.
FAN FAILURE WARNING INDICATOR AND ALARM : If forced air cooling is stopped due to failure of any one or both the fans, the red “ TEMP. FAULT “ LED will be illuminated and an alarm buzzer will be activated. The unit is required to be switched off immediately as loss of forced air cooling may result in major damage to the unit. INSTALLATION AND OPERATION 1. Ensure that the space where the unit is to be installed has adequate air supply for cooling.
OPERATION OF BATTERY BACK-UP WARNING! THE BATTERY SHOULD BE LOCATED IN A WELL VENTILATED AREA TO SAFELY DISSIPATE HYDROGEN GAS PRODUCED DURING THE CHARGING PROCESS. Please refer to the schematic at fig. A above. Regulated output voltage of 28 V +/ - 1% from the modules ( measured at screw terminals S5 and S6 (Fig.1) is fed to the positive and negative DC bus bars and from there to the output terminals LOAD+ and LOAD- through the isolating Schottky Diode D1.
If the input A.C. power is interrupted, the external battery feeds the load instantaneously through the Schottky Diode D2 (D2 will by-pass the resistors R1 & R2). Voltage available to the load will be approximately 0.4V lower than the battery voltage due to forward voltage drop across D2. When the input A.C. power returns, the battery will be isolated and the load current will once again be supplied by the power supply. The discharged battery will recharge through R1 & R2.
The output voltage of the paralleled modules or the common DC bus (before the Schottky Diodes D1) can be adjusted between 26.8 V and 28.5 V by adjusting the voltage of each module individually as per the following procedure ( This procedure is explained for SEC-2450BRM which has 5 modules ). The voltage at the output terminals LOAD + and LOAD – will be as follows : At no load At 10 A load At loads > 10 A Module voltage minus 0.2V Module voltage minus 0.4V Module voltage minus 0.
UPGRADING TO HIGHER CAPACITY – INSTALLING ADDITIONAL MODULE(S) Additional optional module(s) (Model No. SEC-1024MPSB) can be added to upgrade the output current capacity of SEC-2430BRM and SEC-2440BRM by steps of 10A to a maximum of 50A. For example, an SEC-2430BRM (30 A, with 3 modules) can be upgraded to SEC-2440BRM (40A) by adding 1 more module or to SEC-2450BRM by adding 2 more modules . The optional module SEC-1024MPSB comes with an LED and LED holder.
REMOVING A DEFECTIVE MODULE 1. Remove the top cover plate by unscrewing the 10 screws. 2. Locate defective module. Remove the 6 screws from S1 to S6. 3. Remove the input power supply wires from terminals “L” and “N”. Insulate the wire terminals with insulating tape 4. Remove the LED wire connection from terminals “LED 1 & LED 2” . 5. Remove the “SHARE BUS” wire female socket connector from the terminal “JUMP1”.
“ PSM STATUS ” LED(S) DOES NOT LIGHT UP · The associated module has become defective. The unit will still operate normally as the remaining working modules will share a higher load. The unit will go into current limit and the output voltage will drop if the load drawn is more than the combined maximum rated output of the remaining modules. Reduce the load so that the maximum load drawn is less than the combined maximum rated output of the working modules.
LIMITING ELECTROMAGNETIC INTERFERENCE (EMI) 1. Switched mode power supplies ( SMPS ) employ high frequency switching and thus, are a source of radio interference, a recipient of radio interference and a conduit of radio interference. ( Older linear type transformer based power supplies do not employ high frequency switching voltages and will be quieter as compared to switching type of supplies ). 2.
5. The conducted RF noise from these power supplies is limited to the maximum allowable levels by internal filtration. The filtered RF noise currents are bypassed to the chassis of the power supply. The chassis is, in turn connected to the earth ground pin of the AC input power cord (for Class 1 units). Thus, the filtered noise currents are intentionally leaked to the earth ground. This is termed as the “Earth Leakage Current”.
c. Twist the positive and negative wires from the output of the power supply to the radio d. The DC side positive and negative outputs of these power supplies are isolated from the chassis. As explained at paragraph 5 above, the noise currents are filtered to the chassis ground and the chassis ground is connected to the earth ground through the earth ground pin of the AC power outlet receptacle. Avoid connecting (referencing) the DC negative output terminal of the power supply to the earth ground. e.
SPECIFICATIONS SEC-2430BRM NO. OF MODULES 3 INPUT VOLTAGE RANGE 105 TO 125 V AC, 60 HZ INPUT CURRENT 12A SEC-2440BRM 4 OUTPUT VOLTAGE (At terminals L+ & L- , See page 7) NOMINAL, VDC NO LOAD, VDC FULL LOAD, VDC 27.5V OUTPUT REGULATION (At module output S5, S6—Fig. 1) SEC-2450BRM 5 16A 20A 27.6V 27.8V 27.45V 27.4V 1% OUTPUT CURRENT CONTINUOUS SURGE 30A 34.5A 40A 46A 50A 57.
Figure 1. 17. S1 to S4 S5 & S6 L&N LED 1, 2 JUMP 1 F1 VR1 Holes for 4 screws to fasten the module to the chassis Holes for 2 screw to connect to the Positive and Negative output BUS Bars.
Figure 2. “ Daisy Chaining “ of “Share BUS “ jumpers ( Jump 1 ) PSM 1 PSM 2 PSM 3 PSM 4 PSM 5 1 1 1 1 1 2 2 2 2 2 PCB ( Printed Circuit Board ) Jump 1 Jump 1 Jump 1 Jump 1 Jump 1 1. Female socket terminal of the daisy chain. 2. Male 2 pin terminal marked “Jump 1“ on the Power Supply Module. CONTINUITY OF “ DAISY CHAIN “ CONNECTIONS Removing any end module (example PSM1/PSM5 in Fig. 2 above) does not break the daisy chain.
2 YEAR Limited Warranty This product manufactured by Samlex America, Inc. (the “Warrantor”) is warranted to be free from defects in workmanship and materials under normal use and service. This warranty is in effect for 2 years from the date of purchase by the user (the “Purchaser”) If the defective product is within the warranty period, the Purchaser should contact the place of purchase to obtain a Return Authorization Number.
Attach copy of receipt here for your records: Date purchased: Purchased from: Additional notes: 20.
Thank you for purchasing a Samlex power supply product ! Samlex America Inc. 110 –17 Fawcett Road Coquitlam, B.C. V3K 6V2 Canada Ver.
