TDK FPS-T1U, FPS1000-12, FPS-S1U manual Analog functions, 4 A/D Scaling, Output current readback

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VALUE = BYTE VALUE x RESOLUTION

FPS1000 Instruction Manual

7.4.3 Analog functions

Analog functions are provided by a single PCF8591, 4-channel 8-bit A/D converter. When this device is read by the serial buscontroller it provides an 8-bit word with the following information:

Channel 1: Output voltage,

channel 2: Output current,

channel 3: Internal temperature.

The PCF8591 slave address is:

Bit Value

7

6

5

4

3

2

1

0

1

0

0

1

A2

A1

A0

R/W

The PCF8591 device initially requires a control byte to be written to the configuration register. The control byte is as follows:

Bit

Value

7

6

5

4

3

2

1

0

0

A

0

0

0

B

C

D

When a single channel is to be read, A,B,C and D should be determined as follows:

A/D channel

A

B

C

D

Voltage

0

0

0

0

Current

0

0

0

1

Temperature

0

0

1

0

To read all channels with a single control byte, A and B have to be "1", C and D have to be "0". This control byte sets the device so that on each successive read the data from the next A/D is read.Thus, the first result from a sequence of reads should not be considered.

Note that on each read, a conversion is started for a particular channel and the result will be read from the previous channel.

7.4.4 A/D Scaling

The A/D readback has to be scaled to obtain a correct value for the voltage, current and the temperature. Note that the voltage reading is made inside the power supply unit before the "Oring" diode and is typically 0.5V higher than the actual output voltage.

The following scaling should be employed:

Refer to the following table for the scaling of the A/D channels:

FPS1000-12/S

 

0~15V

0.0586 V/Bit

0~80A

0.312 A/Bit

0~100°C

0.391°C/Bit

FPS1000-32/S

FPS1000-24/S

FPS1000-48/S

The measurement range is from 0 to the maximum value listed in the range column. The resolution or scale of reading is linear over the entire range and provides a linear output on the A/D converter.

7.5 Measurements and calculation examples 7.5.1 Output voltage readback

The voltage before the "Oring" diode is measured and can be read from the A/D converter. This voltage is higher than the voltage at the output terminals by 0.5V typically.

Model: FPS 1000-48/S

1.Output voltage (at the output terminals): 48.0V

2.Voltage before the "Oring" diode: 48.0V+0.5V=48.5V

3..Hex readback: CE (1100 1110).

4.Convert the hex readback to decimal: 206

5.Calculate measured Vout: Vout=206*0.2344=48.286V

7.5.2 Output current readback

The output current is sensed by an internal shunt and measured by an A/D converter. Refer to the following examplefor current readback calculation.

1.Actual output current: 21.0A

2.Hex readback: E0 (1110 0000).

3.Convert the hex readback to decimal: 224

4.Calculate measured Iout: Iout=224*0.0977=21.884A.

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Contents FPS Series 1000W In 1U FPS1000 Series Table of Contents Warranty Limitation of WarrantyWarranty Service DisclaimerFPS1000 Power Supply and FPS-S1U Rack Safety Instructions Safety Symbols FPS1000 Series Specifications Outline Drawings FPS 1000 Series Outline Drawings FPS 1000/P Series Outline Drawings FPS1000 Power Supply Installation Connecting the Load Load WiringCurrent Carrying Capacity Noise and Impedance Effects Inductive loadsMaking the load connections Input/Output connector information Repackaging for ShipmentFunctions and Features Dcok signal ACFail signalRemote On/Off control FPS10004.7KΩRemote Sensing Connecting single load, Local sensing Connecting Single Load, Remote SensingConnecting Multiple loads, radial distribution method Basic Connections for OperationMultiple loads connection with distribution terminals Grounding outputsParallel and Series Operation Parallel operationParallel operation with Remote sensing Output voltage trimming at parallel operationSignal Return bus at parallel operation Remote On/Off control at parallel operationSeries operation Series connection for positive and negative output voltageI2C BUS Interface Option Block diagram of the I2C option Operation and functions 7.4.1. Digital statusEeprom functions Analog functions 4 A/D ScalingOutput current readback Typical application diagram FPS1000FPS1000 Maintenance FPS-S1U 19 Rack Single Output Chapter FPS-S1U Rack Specifications Maximum output powerFPS-S1U Rack Installation FPS-S1U Rack MountingControl and monitoring signals connector Rear panel descriptionSCL I2C Modules location Blank panelsFPS-S1U and FPS-S1U/P Outline Drawings FPS-S1U/P Outline Drawing Basic Connections for Operation FPS-S1U Rack Multiple loads connectionSupervisory signals 12.4 On/Off controlOutput voltage trimming Parallel operation with Remote sensing Signal Return bus at parallel operation Output voltage trimming at parallel operationRemote On/Off control at parallel operation FPS-S1U I2C BUS Interface Option IntroductionAddressing A0, A1, A2 FPS-S1U Maintenance Units under warrantyPeriodic maintenance Adjustments and CalibrationFPS-T1U 19 Rack Triple Output FPS-T1U Rack Specifications ChapterFPS-T1U Rack Installation FPS-T1U Rack MountingFPS-T1U Rear panel J1A, J2B, J3C Conector Description Modules location FPS-T1U and FPS-T1U/P Outline Drawings FPS-T1U/P Outline Drawing Basic Connections for Operation FPS-T1U Rack 19.2 On/Off controlOutput Voltag Trimming Load Series operation FPS-T1U I2C BUS Interface Option Module a Module B Module CFPS-T1U Maintenance

FPS1000-32, FPS-S1U, FPS1000-48, FPS1000-12, FPS-T1U specifications

TDK has established itself as a leading innovator in power supply solutions with its range of FPS series products, specifically designed for various demanding applications. Among these, the FPS1000-24, FPS-T1U, FPS1000-12, FPS1000-48, and FPS-S1U models stand out due to their advanced features, robust technologies, and versatile characteristics.

The FPS1000-24, catering to a voltage output of 24V, is ideal for both industrial and commercial applications. It delivers a notable output power of 1000 watts while boasting high efficiency, making it a reliable option for systems that require consistent power with minimal energy loss. The model incorporates advanced protection features including over-voltage, over-current, and short-circuit protection, ensuring that connected devices are safeguarded against potential electrical faults.

Similarly, the FPS1000-12 offers a 12V output with equivalent power ratings, making it suitable for applications such as telecommunications and medical devices where stability and reliability are paramount. This model also emphasizes thermal management, utilizing integrated cooling technologies to maintain optimal performance even under demanding conditions.

The FPS1000-48 distinguishes itself with a 48V output, which is increasingly prevalent in high-density computing environments and server applications. With enhanced scalability, this model allows for multiple unit configurations to support higher load demands while maintaining exceptional efficiency levels.

In addition to the standard offerings, TDK’s FPS-T1U and FPS-S1U models provide intelligent power management solutions. The FPS-T1U, being a compact version, is tailored for space-constrained environments, ensuring high performance without compromising on size. It features built-in monitoring capabilities that allow users to track power usage and efficiency metrics in real-time.

The FPS-S1U is particularly notable for its modular design, enabling easy integration into various systems. This flexibility allows users to adapt the power supply to specific system requirements, enhancing functionality across diverse applications. Both models leverage cutting-edge technology to ensure low standby power consumption, reducing the overall energy footprint.

Overall, TDK’s FPS series exemplifies a commitment to quality, performance, and adaptability, making them ideal candidates for modern power supply needs across industries. With their comprehensive protection mechanisms, efficiency, and innovative designs, they stand as reliable choices for engineers and designers looking to optimize their systems.
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