Yokogawa E9716YB Power Supply Unit

The Yokogawa E9716YB, also cataloged as the E9716YB Power Supply Unit, operates as a dedicated hardware component for direct internal DC voltage distribution within Yokogawa DCS chassis platforms.

Hardware Specifications

Cold Junction Compensation & Channel-to-Channel Power Isolation

The Yokogawa E9716YB power supply unit incorporates high-frequency line filtering and galvanic isolation transformers to suppress incoming grid harmonics before routing secondary DC power down the backplane. By maintaining sub-millivolt ripple noise on the primary 5 V DC rail, the module prevents power-line cross-talk into sensitive downstream 4-20 mA HART loop processing circuits and analog-to-digital input channels. Furthermore, stable low-voltage DC rails minimize thermal drift across field terminal blocks, supporting accurate cold junction compensation (CJC) measurements across adjacent thermocouple and RTD interface cards.

Frequently Asked Questions

Q: What mechanisms prevent backplane voltage drops when the unit operates at max current output? A: The module internal control loop regulates the 5 V DC bus dynamically under full 10 A load conditions to prevent bus sag and module resets across adjacent backplane slots.

Q: Can the input supply voltage range be changed automatically on field installation? A: Field technicians must confirm incoming AC supply voltages prior to wiring, matching line input terminals to either 100-120 V AC or 200-240 V AC supply taps as defined by module terminal configuration.

Field Installation Guidelines

First, ensure complete isolation of mains power sources before inserting or removing the power supply module from the system chassis. Mount the unit securely using standard chassis guide rails to maintain full mechanical contact with internal backplane connector pins. Second, connect all field AC wiring using stranded copper conductors rated for local ambient temperature extremes, keeping high-voltage AC input lines strictly segregated from sensitive low-voltage 4-20 mA field signal cables. Finally, verify that the cabinet protective earth (PE) bus connects directly to the module chassis ground point via a dedicated low-impedance ground strap to safely discharge common-mode electrical surges.