Description

Woodward 9905-970 Power Supply Module

As an authorized Woodward distributor, Saulcontrol delivers critical power solutions for industrial control systems with comprehensive 1-year warranties and expert technical support for reliable operation.

Technical Specifications

Product Model	Woodward 9905-970
Manufacturer	Woodward, Inc.
Product Type	Redundant Power Supply Module
Input Voltage	18-36V DC (24V nominal)
Output Voltage	5V DC ±0.5%
Output Current	15A continuous
Redundancy	N+1 parallel operation
Efficiency	≥92% at full load
Hold-up Time	≥20 ms
Protections	OVP, OCP, SCP, OTP
Operating Temp	-40°C to +85°C
MTBF	>500,000 hours
Dimensions	120 × 60 × 40 mm

Main Features and Advantages

The 9905-970 provides reliable redundant power for critical control systems with advanced load-sharing technology. Featuring hot-swap capability, it allows module replacement without system shutdown during maintenance operations. The power supply’s wide input voltage range (18-36V DC) ensures stable operation during voltage sags and surges common in industrial environments.

High efficiency design (≥92%) minimizes heat generation and reduces cooling requirements. Comprehensive protection circuits include overvoltage (OVP), overcurrent (OCP), short-circuit (SCP), and overtemperature (OTP) protection with automatic recovery. Integrated OR-ing diodes enable seamless current sharing between parallel units, ensuring uninterrupted power to connected controllers like the 5437-523 governor.

9905-973

Application Areas

Power Generation: The 9905-970 provides redundant power for turbine control systems in combined cycle plants, ensuring continuous operation during grid disturbances. In hydroelectric facilities, it powers governor controllers and protection relays where power stability is critical for grid synchronization.

Industrial Control: Critical manufacturing processes utilize this module for PLC and DCS systems requiring uninterrupted operation. Oil and gas installations deploy it for safety instrumented systems (SIS) where power redundancy is mandated by SIL requirements. The module’s extended temperature range makes it suitable for outdoor substation installations.

Related Products

9905-971 – Higher capacity version (25A output)
9907-164 – Power distribution module
9907-852 – Redundancy controller module
5437-523 – Digital governor compatible with this power supply
UG-40 – Speed sensor interface module
8270-1090 – Hydraulic actuator control module
5442-258 – Communication gateway

Installation and Maintenance

Installation Preparation: When installing the 9905-970, ensure proper ventilation spacing (minimum 25mm between modules). Use appropriate wire gauges (min 12 AWG) for input connections and torque terminals to 0.8 N·m. Implement separate input fusing for each module in redundant configurations. Verify load sharing balance using test points during commissioning.

Maintenance Suggestion: Perform quarterly thermal imaging scans to detect abnormal heating. Monitor output voltage ripple annually using oscilloscope measurements. Clean air vents every six months in dusty environments. Replace electrolytic capacitors after 5 years continuous operation. Maintain spare modules configured with identical settings for rapid replacement.

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