Woodward V90RD-2525-MBR 9907-1953 ACTUATOR w/REMOTE SERVO

An MPU loss-of-signal occurs when an MPU frequency of less than 100 Hz is

measured and the previously measured speed was greater than 120 Hz. The

alarm relay de-energizes, and the MPU FAIL LED turns on and remains on until

a reset or until power is cycled. If the TRIP ON MPU FAILURE option is "yes", a

trip occurs. If the previously measured speed is less than 120 Hz, it is assumed

that a normal rolldown has occurred. The MPU FAIL LED does not turn on, the

alarm relay does not de-energize, and no trip occurs.

After a normal rolldown, each ProTech unit monitors the MPU. If the MPU

frequency exceeds 110 Hz, the unit trips and annunciates the cause as NO RESET.

When the short circuit has been removed, the supply will resume normal operation (Note that if the 24 V or 5 V outputs

are shorted, these power converters will be latched OFF and can only be cleared by removing the shorted

condition and removing the input power for 1 minute (or until the front panel LEDs extinguish). If no short

circuit is found, reset the supply by removing input power for one minute. If the power supply is still not

functioning after input power has been restored, verify that the supply is properly seated to the

motherboard connector. If the supply is properly seated but is not working, then replace the supply.

Simplex Power Supply Checks

The following is a troubleshooting guide for checking areas which may present difficulties. If these checks

are made prior to contacting Woodward for technical assistance, system problems can be more quickly

and accurately assessed.

• Is the input power within the range of the control’s power supply input?

• Is the input power free of switching noise or transient spikes?

• Is the power circuit dedicated to the governor only?

• Are the control’s supplies indicating that they are OK?

• Are the control’s supplies outputting the correct voltage?

• Is the RTN / CPU Low Vcc LED ON?

Woodward Discrete Input - 16 Channel 8200-1104

Woodward Discrete Output - 16 Channel 8200-1105

Woodward Termination Resistor Kit 8923-1889

Woodward Dataforth I/O Thermocouple - K-Type 1784-1028

Woodward Dataforth I/O RTD - 100 Ohm 1784-655

Woodward Dataforth I/O 4-20 mA Input 1784-659

Woodward Table A. NetCon Analog Cables 12 feet, Black 5416-349

Woodward Table A. NetCon Analog Cables 14 feet, Black 5416-350

Woodward Table A. NetCon Analog Cables 16 feet, Black 5416-351

Woodward Dataforth I/O 0-5 VDC Input 1784-657

Woodward Network Switches Ethernet - 8 Port, RJ45 Connectors 1711-1350