CECOM LAR Tropo Operation Course

CECOM LAR Tropo Operation Course
PP-7904 & PP-7905 Low Voltage Power Supplies and DC Voltage Distribution Units CECOM LAR Course Logistics Assistance Division Fort Monmouth, New Jersey In this class we will discuss the PP-7904 LVPS-1 and the PP-7905 LVPS-2 Low Voltage Power Supplies to include the DC distribution units bus bars. Low Voltage Power Supplies

Purpose To provide all the DC Voltages to all the units within the TROPO system excluding the (DGM) equipment. The outputs from these two Low Voltage Power Supplies are coupled to DC Distribution Units. Recap purpose: The PP-7904 LVPS-1 and the PP-7905 LVPS-2 Low Voltage Power Supplies provide the DC Voltages to all the units within the TROPO system excluding the DGM Equipment. The outputs from these two Low Voltage Power Supplies are coupled to DC distribution unit bus bars and then distributed to various assemblies within the TROPO system. The AN/TRC-170(V)2 and AN/TRC-170(V)3 both contain these two Low Voltage Power Supplies. The PP-7904 is called LVPS-1 and the PP-7905 is called LVPS-2. LVPS-1 supplies only positive voltages and LVPS-2 provides both negative voltages as well as positive voltages. Low Voltage Power Supplies

PP-7904 LVPS-1 Block Diagram
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 Block Diagram Now lets take a look at the Block Diagram for the PP-7904 called the LVPS-1. Please refer to FO 3-1. Follow the Signal Flow: 1. AC Voltage Input: the filtered 115 VAC 3-phase, 50/60/400 Hertz input is applied to EMI Filter FL1. 2. FL1: the 3-phase input AC is first applied to the EMI Filter FL1, which reduces emissions on the input lines. The output of the this filter is coupled to bridge rectifier circuit CR1 and the auxiliary power supply transformer T1. 3. CR1: is a 3-phase bridge rectifier circuit that produces the unregulated +/-150 VDC that is sent to all four power circuit card assemblies. 4. T1 transformer & associated circuitry : transformer T1 is a step down transformer that steps down the 115 VAC input and associated circuitry rectifiers this AC voltage to produce a +20VDC output that is sent to all four power circuit cards. 5. A1 CCA +5.3 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +5.3 VDC (A) rated at 22 Amps. 6. A2 CCA +28 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +28 VDC (A) rated at 8 Amps. 7. A2 CCA +28 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +28 VDC (B) rated at 8 Amps. 8. A4 CCA +15VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +15 VDC rated at 18 Amps. Low Voltage Power Supplies

PP-7904 LVPS-1 AC Input Voltage Signal Flow
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 AC Input Voltage Signal Flow Now lets take a look at the AC Input Voltage Signal Flow for the PP-7904 called the LVPS-1. Please refer to FO 3-1. Follow the Signal Flow: 1. AC Voltage Input: the filtered 115 VAC 3-phase, 50/60/400 Hertz input is applied to EMI Filter FL1. 2. FL1: the 3-phase input AC is first applied to the EMI Filter FL1, which reduces emissions on the input lines. The output of the this filter is coupled to 3-phase bridge rectifier circuit CR1 and the auxiliary power supply transformer T1. Neon light indicator DS7, located under the top cover on the back left side will illuminate when Phase A and Neutral are correctly passed through the EMI Filter FL1. 3. CR1: is a 3-phase bridge rectifier circuit that produces the unregulated +/-150 VDC that is sent to all four power circuit card assemblies. 4. T1 transformer & associated circuitry : T1 is a step down transformer that steps down the 115 VAC input and associated circuitry rectifies this AC voltage to produce a +20VDC output that is sent to all four power circuit cards. DS1 the Power On LED, located on the front panel is illuminated when the +20 VDC is properly developed by T1 and associated circuitry. Low Voltage Power Supplies

PP-7904 LVPS-1 DC Voltage Power CCAs A1-A4
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 DC Voltage Power CCAs A1-A4 Now lets take a look at the DC Output Voltages of the CCAs for the PP-7904 called the LVPS-1. Please refer to FO 3-1. Follow the Signal Flow: 1. A VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered & regulated voltage that appears on TB-1 as the +5.3 VDC (A) output & can be adjusted by R20 for a range of to VDC (1%). 2. A2 +28 VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered & regulated voltage that appears on TB-1 as the +28 VDC (A) output & can be adjusted by R20 for a range of to VDC (1%). 3. A3 +28 VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered & regulated voltage that appears on TB-2 as the +28 VDC (B) output & can be adjusted by R20 for a range of to VDC (1%). This A3 CCA provides the +28 VDC that powers the internal LVPS-1 Fan Assembly B1. 4. A4 +15 VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered & regulated voltage that appears on TB-2 as the +15 VDC output & can be adjusted by R20 for a range of to VDC (1%). Low Voltage Power Supplies

PP-7905 LVPS-2 Block Diagram
CECOM LAR Tropo Operation Course PP-7905 LVPS-2 Block Diagram Now lets take a look at the Block Diagram for the PP-7905 called the LVPS-2. Please refer to FO 3-2. Follow the Signal Flow: 1. AC Voltage Input: the filtered 115 VAC 3-phase, 50/60/400 Hertz input is applied to EMI Filter FL1. 2. FL1: the 3-phase input AC is first applied to the EMI Filter FL1, which reduces emissions on the input lines. The output of the filter is coupled to a 3-phase bridge rectifier circuit CR1 & auxiliary power supply transformer T1. 3. CR1: is a 3-phase bridge rectifier circuit that produces the unregulated +/-150 VDC that is sent to all four power circuit card assemblies. 4. T1 transformer & associated circuitry : transformer T1 is a step down transformer that steps down the 115 VAC input and associated circuitry rectifies this AC voltage to produce a +20VDC output that is sent to all four power circuit cards. 5. A1 CCA +5.3 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +5.3 VDC (B) rated at 22 Amps. 6. A2 CCA -5.3 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of -5.3 VDC rated at 22 Amps. 7. A2 CCA +28 VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of +28 VDC (C) rated at 8 Amps. 8. A4 CCA -15VDC: receives inputs of +/-150 VDC and +20 VDC and provides an output of -15 VDC rated at 18 Amps. Low Voltage Power Supplies

PP-7905 LVPS-2 AC Input Voltage Signal Flow
CECOM LAR Tropo Operation Course PP-7905 LVPS-2 AC Input Voltage Signal Flow Now lets take a look at the AC Input Voltage Signal Flow for the PP-7905 called the LVPS-2. Please refer to FO 3-2. Follow the Signal Flow: 1. AC Voltage Input: the filtered 115 VAC 3-phase, 50/60/400 Hertz input is applied to EMI Filter FL1. 2. FL1: the 3-phase input AC is first applied to the EMI Filter FL1, which reduces emissions on the input lines. The output of the this filter is coupled to 3-phase bridge rectifier circuit CR1 and the auxiliary power supply transformer T1. Neon light indicator DS7, located under the top cover on the back left side will illuminate when Phase A and Neutral are correctly passed through the EMI Filter FL1. 3. CR1: is a 3-phase bridge rectifier circuit that produces the unregulated +/-150 VDC that is sent to all four power circuit card assemblies. 4. T1 transformer & associated circuitry : T1 is a step down transformer that steps down the 115 VAC input and associated circuitry rectifies this AC voltage to produce a +20VDC output that is sent to all four power circuit cards. DS1 the Power On LED, located on the front panel is illuminated when the +20 VDC is properly developed by T1 and associated circuitry. Low Voltage Power Supplies

PP-7905 LVPS-2 DC Voltage Power CCAs A1-A4
CECOM LAR Tropo Operation Course PP-7905 LVPS-2 DC Voltage Power CCAs A1-A4 Now lets take a look at the DC Output Voltages of the CCAs for the PP-7905 called the LVPS-2. Please refer to FO 3-2. Follow the Signal Flow: 1. A VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered and regulated voltage that appears on TB-1 as the +5.3 VDC (B) output & can be adjusted by R20 for a range of to VDC (1%). 2. A VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered and regulated voltage that appears on TB-1 as the -5.3 VDC output & can be adjusted by R20 for a range of to VDC (1%). 3. A3 +28 VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered and regulated voltage that appears on TB-2 as the +28 VDC (C) output & can be adjusted by R20 for a range of to VDC (1%). This A3 CCA provides the +28 VDC that powers the internal LVPS-2 Fan Assembly B1. 4. A4 -15 VDC CCA: receives the +/- 150 VDC & + 20 VDC input voltages from CR1 & T1. It then produces a filtered and regulated voltage that appears on TB-2 as the -15 VDC output & can be adjusted by R20 for a range of to VDC (1%). Low Voltage Power Supplies

PP-7904 LVPS-1 Front Panel Indicators
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 Front Panel Indicators Now lets take a look at the PP-7904 LVPS-1 front panel Light Emitting Diode (LED) indicators. 1. POWER ON LED (green): indicates that prime power is applied to LVPS-1 and that Transformer T1 and associated circuitry is providing the required +20 VDC output. 2. EQUIPMENT FAILURE LED (red): indicates that the output voltages are not within 5% of the nominal values. 3. OVERCURRENT +28 VDC LED (red): indicates that the +28V (B) overcurrent is exceed. 4. OVERCURRENT +15 VDC LED (red): indicates that the +15V overcurrent is exceed. 5. OVERCURRENT +5.3 VDC LED (red): indicates that the +5.3V overcurrent is exceed. 6. OVERCURRENT +28 VDC LED (red): indicates that the +28V (A) overcurrent is exceed. Low Voltage Power Supplies

PP-7905 LVPS-2 Front Panel Indicators
CECOM LAR Tropo Operation Course PP-7905 LVPS-2 Front Panel Indicators Now lets take a look at the PP-7905 LVPS-2 front panel Light Emitting Diode (LED) indicators. 1. POWER ON LED (green): indicates that prime power is applied to LVPS-2 and that Transformer T1 and associated circuitry is providing the required +20 VDC output to all the circuit cards. 2. EQUIPMENT FAILURE LED (red): indicates that the output voltages are not within 5% of the nominal values. 3. OVERCURRENT +28 VDC LED (red): indicates that the +28V (C) overcurrent is exceed. 4. OVERCURRENT -15 VDC LED (red): indicates that the -15V overcurrent is exceed. 5. OVERCURRENT +5.3 VDC LED (red): indicates that the +5.3V (B) overcurrent is exceed. 6. OVERCURRENT -5.3 VDC LED (red): indicates that the -5.3V overcurrent is exceed. Low Voltage Power Supplies

PP-7904 LVPS-1 CCA Location Now lets take a look at the PP-7904 Low Voltage Power Supply LVPS-1 Circuit Card (CCA) Component location. 1. A VDC CCA: located on the top left location. The +5.3 VDC (A) output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 2. A2 +28 VDC CCA: located on the bottom left location. The +28 VDC (A) output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 3. A3 +28 VDC CCA: located on the top right location. The +28 VDC (B) output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 4. A4 +15 VDC CCA: located on the bottom right location. The +15 VDC output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and the red LED, when the output is adjusted within tolerance the green led is lit and red LED lights when it is out of tolerance. Low Voltage Power Supplies

PP-7905 LVPS-2 CCA Location Now lets take a look at the PP-7905 Low Voltage Power Supply LVPS-2 Circuit Card (CCA) Component location. 1. A VDC CCA: located on the top left location. The +5.3 VDC (B) output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 2. A VDC CCA: located on the bottom left location. The -5.3 VDC output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 3. A3 +28 VDC CCA: located on the top right location. The +28 VDC (C) output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. 4. A4 -15 VDC CCA: located on the bottom right location. The -15 VDC output can be adjusted by R20 for an output range of to VDC. Located near variable resistor R20 is a green and red LED, when the output is adjusted within tolerance the green led is lit and the red LED lights when it is out of tolerance. Low Voltage Power Supplies

PP-7904 LVPS-1 Rear Panel View
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 Rear Panel View Now lets discuss the PP-7904 LVPS-1 Rear View Panel. Refer to Slide 13 above. Connector Jack Nomenclature J Power 3-Phase VAC Input J Alarm Monitor Output TB VDC (A) and +28 VDC (A) Output TB VDC (B) and + 15 VDC Output E Ground Connection Low Voltage Power Supplies

PP-7905 LVPS-2 Rear Panel View
CECOM LAR Tropo Operation Course PP-7905 LVPS-2 Rear Panel View Now lets discuss the PP-7905 LVPS-2 Rear View Panel. Refer to Slide 14 above. Connector Jack Nomenclature J Power 3-Phase VAC Input J Alarm Monitor Output and the Remote shutdown from the Transmit or Receive Modem as an Input logic level (1) voltage. TB VDC (B) and -5.3 VDC Output TB VDC (C) and - 15 VDC Output E Ground Connection pp-7904 Low Voltage Power Supplies

PP-7904 & PP-7905 DS7 Neon Lamp Location
CECOM LAR Tropo Operation Course PP-7904 & PP-7905 DS7 Neon Lamp Location Now lets discuss where the PP-7904 and PP-7905 DS7 Neon Light Indicator is located within both Low Voltage Power Supplies. 1. DS7 Neon Light Location: is located under the top cover on the back left side. It illuminates when Phase A and Neutral are properly passed through the EMI Filter FL1. Low Voltage Power Supplies

PP-7904 & PP-7905 CCA Variable Resistor R20 & LEDs
CECOM LAR Tropo Operation Course PP-7904 & PP-7905 CCA Variable Resistor R20 & LEDs Now lets discuss where Variable Resistor R20 is located on the Circuit Card Assemblies. On both sides of the Variable Resistor R20 is two LEDs, on the left side is the green LED and on the right side is the red LED. 1. Variable Resistor R20: this Variable Resistor R20 is located on each CCA to properly adjust the output DC voltage. 2. Green LED: located on the left side of Variable Resistor R20. It is lit when there is an output DC voltage from this circuit card assembly. 3. Red LED: located on the right side of Variable Resistor R20. It is lit when an internal fault occurs on this circuit card assembly. Low Voltage Power Supplies

PP-7904 LVPS-1 DC Distribution AN/TRC-170(V)2
CECOM LAR Tropo Operation Course PP-7904 LVPS-1 DC Distribution AN/TRC-170(V)2 Now lets discuss the PP-7904 LVPS-1 DC Distribution for the AN/TRC-170(V)2. Please refer to FO 3-3. Low Voltage Power Supplies

Summary Purpose DC Voltage Outputs DC Voltage Distribution LVPS-2 Remote Shut Down from Transmit or Receive Tropo Modem Q: What is the purpose of DS7 and where is it located on both of the PP-7904 & the PP-7905 Low Voltage Power Supplies? A: It will illuminate letting you know that Phase A and Neutral are correctly passed through the EMI Filter FL1 assembly. It is located inside of the LVPS. Q: What Power Supply and what Circuit Card produces the +5.3 VDC (B)? A: The PP-7905 LVPS-2 and the A1 CCA. Q: What is the output voltage of Transformer T1? A: +20 VDC Q: What Circuit Card Assemble (CCA) in the PP-7904 LVPS-1 provides voltage to the internal Fan B1 and what amount of voltage does it provide? A: The A3 CCA and it also provides +28 VDC to power the internal Fan B1. Q: What DC Voltage does TED #2 in the AN/TRC-170(V)3 use and what LVPS provides it? A: + 28 VDC (C ) and it comes from the PP-7905 LVPS-2. Q: What external units can shutdown the PP-7905 LVPS-2 if they overheat? A: The Transmit or Receive TROPO Modem. Q: What two voltages does CR1 provide in both Low Voltage Power Supplies? A: The +150 VDC and the -150 VDC. Low Voltage Power Supplies

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CECOM LAR Tropo Operation Course

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