KEPCO HSF 5-10 Single Output 50 Watt Hot Swap Plug In Power Supplies Instruction Manual

KEPCO HSF 5-10 Single Output 50 Watt Hot Swap Plug-In Power Supplies

Specifications

The Kepco HSF 50 Watt Series hot-swappable, high-frequency switching, plug-in power supplies employ forward conversion and are designed to operate in a fault-tolerant power system with either a-c or d-c input. They feature a thermistor soft-start circuit, a built-in forced current share circuit, and OR-ing diodes for hot-swap and parallel-redundant N+1 operation.

Output Ratings and Specifications

Model| Output Volts, d-c (Nominal)| Adjustment Range| Output Current (Nominal)| Output Power (Nominal)| Ripple and Noise (d-c-50MHz)
---|---|---|---|---|---

Product Features

• Alarm Circuit: The HSF includes an isolated internal relay offering normally closed and normally open contacts for alarm circuits.
• Keying: Keying of the HSF is established at the factory, ensuring correct voltage insertion in the rack adapter slot.

Product Usage Instructions

1. Installation: Ensure proper keying alignment when inserting the power supply into the rack adapter slot.
2. Power On: Apply power input within the specified voltage ranges for stable operation.
3. Fault Handling: In case of output overvoltage shutdown, wait for at least 60 seconds before turning the unit back on.
4. Maintenance: Regularly check for proper operation and ensure EMI filtering compliance.

INTRODUCTION

• The Kepco HSF 50 Watt Series hot-swappable, high-frequency switching, plug-in power supplies employ forward conversion and are designed to operate in a fault-tolerant power system with either a-c or d-c input. A thermistor soft-start circuit limits start-up surge. A built-in forced current share circuit and OR-ing diodes allow configuration for hot-swap and parallel-redundant N+1 operation.
• These power supplies are designed to be used with Kepcos Series RA 19-(X)B rack adapters. The RA 19-8B rack adapter accepts up to eight 50 Watt or 100 Watt units (see Figure 1); RA 19-7B accepts up to four 50 Watt or 100 Watt units and three 150 Watt units; RA 19-6B accepts up to six 150 Watt units. All input/output connections are through a 24-pin connector that plugs into the rack adapter. All external connections are made through the rack adapter. Surface mount technology permits efficient component layout for minimum mounting space.
• Five models may be selected for outputs of 5, 12, 15, 24, or 48V (see Table 1).
  When the input is cut off, the output is maintained for 15 milliseconds minimum. If the power supply shuts down due to an output overvoltage condition, it is then necessary to wait 60 seconds minimum before turning the unit on again. EMI filtering is designed to meet FCC Class B rating and VDE 0871 Class B rating. This page contains specifications for each model of the HSF 50 Watt Series. Environmental specifications for each model are the same.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, HSF 50W SERIES

FEATURES

FRONT PANEL ACCESS. The front panel provides a power ON/OFF switch controlling input power and a “VDC ON” light redundant configurations while a) the output is less than 10% of nominal or b) the output is within 10% to 100% of nominal and the unit is functioning as a master. In parallel redundant configurations, the module with the highest voltage functions as the master. The other units are slaves, and track the output voltage of the master. Refer to Current Share Bus (CSB) on page 3 for details. The front panel Vadi trimmer provides adjustment of the output voltage within the limits specified in Table 1; test points connected to the +S and -S lines are available at the front panel for measuring the output.

FORCED CURRENT SHARE CIRCUI T. When units are configured for N+1 parallel redundant operation, it is desirable for the current to be divided equally among the paralleled supplies. When the CSB (Current Share Bus) lines of paralleled HSF units are connected, the load current is forced to divide equally between all paralleled units. If one unit fails, the remaining units will continue to supply the load, and the load current will be divided equally among the remaining operating units. The failed unit is automatically isolated from the circuit by a built-in isolation diode. Refer to Current Share Bus (CSB) on page 3 for details.

ALARM CIRCUIT. The HS includes an isolated internal relay offering normally closed and normally open contacts referred to as an isolated common. These contacts may be used to configure “close on failure” or “open on failure” alarm circuits. (Refer to the Series RA 19-(X)B Manual for alarm configurations for multiple HSF power supplies.)

KEYING. Keying of the HSF is established at the factory. The output voltage determines which keyway is open. When the corresponding rack adapter key (pin) is installed by the user, only a power supply of the correct voltage can be inserted in the rack adapter slot.

FIGURE 1. HSF 50 WATT POWER SUPPLIES (8) INSTALLED IN RA 19-8B RACK ADAPTER

SPECIFICATIONS

The Sulyour peo earned aly to Her So at Series models (also refer to Table 1). Other models are also available;

INPUT:

• Voltage: 120V a-c/240V a-c nominal; Range 95-264V a-c; 125-370V d-c. (polarity insensitive)
• Frequency: Nominal 50-60 Hz; Range 47-440Hz (at 440Hz leakage current exceeds ULNDE safety spec. limit). Current (nominal output at rated load): @120V a-c rms: 1.0A a-c typ., 1.2A a-c max; @240V a-c rms: 0.5A a-c typ., 0.7A a-c max.
• Initial Turn-on Surge: (one-half of first input cycle): @120V a-c rms, 45A max., @240V a-c rms, 90A max.
• Brownout Voltage: 85V a-c, 110V d-c
• Switching Frequency: 120KHz typical, nominal load

STABILIZATION

• Source Effect: Range 95-132V a-c or 190-264V a-c, 1.0% typ.; 2.0% max.
• Temperature is Range 40 4d. 10 p : 29% ma
• Combined Effect: 2.0% typ.; 4.0% max. (includes source, load, and temperature effects).
• Time Effect: 0.1% tvp.: 0.5% max. (1/2 hr-8 hr at 25ºC).

RECOVERY CHARACTERISTICS: A step load change from 50% to 100% produces less than +4% output excursion.
Recovery occurs to within $1% of the original setting in <2 ms (load change t, or t equal to or greater than 50usec).

• START-UP TIME: 500 ms. maximum.
• HOLDUP TIME: 20 ms. typ. (120V a-c), 15 ms. min (100V a-c).

DIELECTRIC STRENGTH

• Between input and output: 2KV a-c for one minute.
• Between input and output with Y-capacitor removed: 3.75KV a-c for one minute.
• Between input and case (ground): 2KV a-c for one minute.

INSULATION RESISTANCE: Between input and ground, output and ground, input and output; 100 Megohms min. (500V d-c).

LEAKAGE CURRENT

• (UL method, 120V a-c): 0.5 mA maximum.
• (VDE method, 240V a-c): 0.75 mA maximum.

SAFETY: Units designed to meet UL60950 3rd Edition, CSA 22.2 No. 60950 and EN 60950 and are CE marked per the Low Voltage Directive (LVD), 73/23/EEC and 93/68/EEC. [The standards do not apply with DC input operation.]

• 1/0 CONNECTOR: The 24-pin 1/0 connector (Figure 2) is designed to mate with the corresponding connector in the Series RA 19-(X)B Rack Adapter.
• (+) SENSE, (-) SENSE: These lines are provided to compensate for voltage drops in the load connecting wires. The Sense lines must be connected to their respective (+) and (-) output terminals, either at the load or at the rack adapter (see Rack Adapter Manual). The connection ensures the most accurate error tracking. Error compensation in the connecting wires is up to 0.25 Volts per lead for all models.

NOTE: The Sense lines must be connected for the HSF Power supply to work properly!

OUTPUT (+), OUTPUT (-): HSF power supply d-c output.
CURRENT SHARE BUS (CSB) : Connecting the CSB lines of HS power supplies operating in a parallel configuration causes output current to be shared equally. (See Rack Adapter Manual for additional information on parallel configurations.). For current sharing to work properly the outputs of all paralleled units must be within 250 mV (max) of each other and each unit must be operating at between 10% to 100% of rated output. If the current to the load goes below 10% for each unit in the current share mode, all MASTER ON lights may go on (see load effect specifications); this indicates that forced current share is no longer working, units are simply in the current share mode. (If forced current sharing at less than 10% nominal current per supply is needed, contact Kepco application engineering.) Remote sensing is recommended. For master/slave operation to work properly each unit should be adjusted to 40 mV (optimum) less than the next paralleled unit (unit 1 is adjusted to VOUT, unit 2 to VOUT – 40mV, and unit 3 to VOUT – 80mV, etc. If the master fails, the unit 2 will become the new master). The 40 mV difference can be reduced to a minimum of 25 mV as needed to parallel many units and still keep all units within 250 mV of each other. Adjust the outputs usingthe Vadj trimmer on the front panel.

• The optimum difference among output voltages of paralleled units: 40mV
• The maximum difference among output voltages of paralleled units: 250 mV
• The minimum difference among output voltages of paralleled units: 25 mV

ALARM : The Alarm NC (normally closed) – Open on Failure and Alarm NO (normally open) – Close on Failure lines are relay contacts referenced to Alarm Common. If the unit fails, the path between Alarm NC – Open on Failure and Alarm
Common opens, the path between Alarm NO – Close on Fail and Alarm Common is a short circuit. Figure 3 illustrates typical Close on Fail and Open on Fail circuits to give a failure indication if any one of many power supplies fails.

INPUT POWER: Line (either a-c or d-c source power), Neutral and Ground (chassis)

EMI: Designed to meet FCC Class B (100-120V a-c) and VDE 0871 Class B (220-240V a-c).
VIBRATION: (non-operating, one hour on each one of the three axes):

• 5-10 Hz, 10 mm amplitude.
• 10-55 Hz, 2g acceleration.

SHOCK: (non-operating, one-half sinusoidal pulse, three shocks to each axis):

• Acceleration: 20g
• Duration: 11ms +5ms
• OPERATING TEMPERATURE: See Figure 4.
• STORAGE TEMPERATURE: -40°C to +75°C.
• OPERATING AND STORAGE RELATIVE HUMIDITY: up to 95% (wet bulb temp. <35°C non-condensing).
• FUSE: Quick acting 3.0A, 250V; (5.2 x 20mm), San-O P/N MT4 3A; Керсо P/N 541-0110.
• DIMENSIONS: See Figure 5.
• WARRANTY: 5 years.

FIGURE 5. HS POWER SUPPLY OUTLINE DRAWING

MORE INFORMATION

KEPCO, INC.
131-38 SANFORD AVENUE

• FLUSHING, NY. 11352 U.S.A.

• TEL 718-461-7000

• FAX 718-767-1102
  http://www.kepcopower.com

• email : hq@kepcopower.com

• 228-1299 REV 5

FAQ

• Q: How do I configure multiple HSF power supplies for alarm circuits?
  • A: Refer to the Series RA 19-(X)B Manual for alarm configurations with isolated internal relay contacts.
• Q: Can I use the HSF power supplies in parallel-redundant N+1 operation?
  • A: Yes, the HSF series supports configuration for hot-swap and parallel-redundant N+1 operation using the built-in forced current share circuit and OR-ing diodes.

References

• AC-DC Power Supplies and Electronic Loads by Kepco

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