Yokogawa PW702-S1 Power Supply Module
The Yokogawa PW702-S1, also cataloged as the PW702 Power Supply Module, operates as a dedicated hardware component for converting line-level AC power into regulated DC bus voltage within CENTUM CS 3000 / VP DCS rack assemblies.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PW702-S1 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 1.5 kg |
| Dimensions | 5.1 cm x 22.9 cm x 20.3 cm |
| Operating Temp | -20 deg C to +70 deg C |
| Power Consumption | 250 VA |
| Input Voltage | 100-240 VAC, 50/60 Hz |
| Maximum Input Current | 1.2 A |
| Rated Output Voltage | 24 VDC +/- 5% |
| Rated Output Current | 6 A (total across outputs 1 and 2) |
| Output Hold-up Time | 20 ms |
| Isolation Strength | 1500 VAC between input and FG terminal |
| Status Indicator | READY LED (green) |
Channel Isolation and Power Bus Architecture
The PW702-S1 utilizes transformer-isolated power conversion topology to achieve 1500 VAC dielectric withstand capability between the AC input terminals and the frame ground (FG). This isolation prevents common-mode high-voltage transients on the primary utility line from coupling onto the 24 VDC backplane bus. The internal power conditioning circuitry mitigates channel-to-channel noise cross-talk and provides output voltage stabilization within a +/- 5% regulation window, preserving signal integrity across analog input cards and cold junction compensation (CJC) circuits operating on the local subsystem rack.
Frequently Asked Questions
Q: What is the maximum allowable hold-up time during an AC power loss event?
A: The module maintains rated output voltage for a minimum of 20 ms following a complete AC input interruption at full nominal load.
Q: How is chassis grounding properly established on the primary terminal block?
A: The primary AC wiring connection requires a direct, low-impedance connection from the line ground lead to the module FG (Frame Ground) terminal to meet the 1500 VAC isolation safety standard.
Field Installation Guidelines
- Mount the module vertically into the designated power supply slot of the DCS base rack, ensuring top and bottom chassis locking mechanisms are fully engaged.
- Verify that line power is de-energized before connecting the 100-240 VAC wiring to the terminal strip.
- Terminate the protective earth conductor directly to the FG terminal using a ring lug and torque to the manufacturer standard.
- Allow a minimum of 50 mm clearance above and below the module heat sink fins to maintain passive convective airflow.
- Apply AC power and verify that the green READY LED illuminates, indicating valid 24 VDC bus output generation.
Yokogawa PW702-S1 Power Supply Module
Yokogawa PW702-S1 Power Supply Module
The Yokogawa PW702-S1, also cataloged as the PW702 Power Supply Module, operates as a dedicated hardware component for converting line-level AC power into regulated DC bus voltage within CENTUM CS 3000 / VP DCS rack assemblies.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PW702-S1 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 1.5 kg |
| Dimensions | 5.1 cm x 22.9 cm x 20.3 cm |
| Operating Temp | -20 deg C to +70 deg C |
| Power Consumption | 250 VA |
| Input Voltage | 100-240 VAC, 50/60 Hz |
| Maximum Input Current | 1.2 A |
| Rated Output Voltage | 24 VDC +/- 5% |
| Rated Output Current | 6 A (total across outputs 1 and 2) |
| Output Hold-up Time | 20 ms |
| Isolation Strength | 1500 VAC between input and FG terminal |
| Status Indicator | READY LED (green) |
Channel Isolation and Power Bus Architecture
The PW702-S1 utilizes transformer-isolated power conversion topology to achieve 1500 VAC dielectric withstand capability between the AC input terminals and the frame ground (FG). This isolation prevents common-mode high-voltage transients on the primary utility line from coupling onto the 24 VDC backplane bus. The internal power conditioning circuitry mitigates channel-to-channel noise cross-talk and provides output voltage stabilization within a +/- 5% regulation window, preserving signal integrity across analog input cards and cold junction compensation (CJC) circuits operating on the local subsystem rack.
Frequently Asked Questions
Q: What is the maximum allowable hold-up time during an AC power loss event?
A: The module maintains rated output voltage for a minimum of 20 ms following a complete AC input interruption at full nominal load.
Q: How is chassis grounding properly established on the primary terminal block?
A: The primary AC wiring connection requires a direct, low-impedance connection from the line ground lead to the module FG (Frame Ground) terminal to meet the 1500 VAC isolation safety standard.
Field Installation Guidelines
- Mount the module vertically into the designated power supply slot of the DCS base rack, ensuring top and bottom chassis locking mechanisms are fully engaged.
- Verify that line power is de-energized before connecting the 100-240 VAC wiring to the terminal strip.
- Terminate the protective earth conductor directly to the FG terminal using a ring lug and torque to the manufacturer standard.
- Allow a minimum of 50 mm clearance above and below the module heat sink fins to maintain passive convective airflow.
- Apply AC power and verify that the green READY LED illuminates, indicating valid 24 VDC bus output generation.
