The Yokogawa PW702, also cataloged as the PW702 Power Supply Module, operates as a dedicated hardware component for AC to DC power conversion within Field Control Station architectures.
Hardware Specifications
Parameter
Specification
Model
PW702
Brand
Yokogawa
Origin
Japan
Weight
4.45 lbs
Dimensions
Standard Field Control Station module size
Operating Temp
0 to 55 deg C
Power Consumption
147.9 W output power capacity
Input Voltage
220-240 VAC (50/60 Hz)
Output Voltage/Current
+/- 5.1 VDC / 29 A
4-20 mA HART Loop Protocol & Channel Isolation
The module incorporates robust galvanic isolation barriers between the high-voltage AC mains input and internal low-voltage DC system rails to maintain backplane power stability. Dedicated power-conditioning circuits suppress high-frequency line harmonics, preventing electrical noise from propagating across 4-20 mA HART loop protocol circuits connected to field analog transmitters. Built-in cold junction compensation (CJC) reference processing units operate deterministically across input channels by maintaining noise-free, regulated power distribution.
Frequently Asked Questions
Q: Can the PW702 power supply module be swapped while the node remains energized?
A: Hot-swapping is permitted only when installed in a redundant dual-power configuration where the secondary power module assumes the full 29 A load without system disruption.
Q: What protection mechanisms exist to safeguard downstream backplane components from line surges?
A: Integrated overvoltage and overcurrent protection circuits isolate the module's +/- 5.1 VDC outputs if input tolerances or thermal thresholds are breached.
Field Installation Guidelines
Mount the PW702 securely into the designated power supply slot of the Field Control Station, verifying complete backplane connector coupling before tightening retaining hardware. Terminate the 220-240 VAC mains wiring with proper strain relief, maintaining a minimum 150 mm physical separation from sensitive low-voltage I/O lines. Wire the module frame ground terminal directly to the main protective earth (PE) bus bar using standard copper grounding conductors. Maintain clear cabinet ventilation above and below the module assembly to prevent thermal shutdown under full 147.9 W load conditions.
