Woodward 8440-1706 B Digital Control System Spare Parts


Woodward 8440-1706 Measuring inputs 100 Vac, 5 A

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The SPM-D11 is a microprocessor-based synchronizer designed for use on one or three-phase AC generators equipped with Woodward or other compatible speed controls and automatic voltage regulators. The SPM-D11 synchronizer provides automatic frequency, phase and voltage matching using either analog- or discrete output bias signals. It combines synchronizing for one circuit breaker, load and power factor control or isochronous load sharing and generator protection.

The daily maintenance and upkeep of the PLC is relatively simple, mainly replacing fuses and lithium batteries, and there are basically no other vulnerable components. Due to the use of lithium batteries to protect the random access memory (RAM), counters, and auxiliary relays with retention functions that store user programs, the lifespan of the lithium battery is approximately 5 years. When the voltage of the lithium battery gradually decreases to a certain extent, the battery voltage on the PLC basic unit drops until the indicator light is on, reminding users that programs supported by the lithium battery can be retained for about a week and the battery must be replaced, This is the main content of daily maintenance.

The steps to replace a lithium battery are as follows:

■ Before disassembly and assembly, the PLC should be powered on for at least 15 seconds (this can charge the capacitor used as a backup power source for the memory. After the lithium battery is disconnected, the capacitor can temporarily power the PLC to protect information in the RAM from being lost); Disconnect the AC power supply of the PLC; Open the battery cover of the basic unit; Remove the old battery and install a new one;

■ Cover the battery cover. Please note that the battery replacement time should be as short as possible, generally not exceeding 3 minutes. If the time is too long, the program in RAM will disappear. In addition, attention should be paid to using the specified model of product when replacing fuses. If a module needs to be replaced, the user should confirm that the installed module is of the same type. Some I/O systems allow modules to be replaced with power, while others require the power to be cut off.

If the problem can be solved after replacement, but the fault occurs again after a relatively short period of time, the user should check the inductive load that can generate voltage, and may need to suppress its current spikes externally. If the fuse is easily blown after replacement, it is possible that the output current of the module exceeds the limit or the output device is short-circuited. The fault diagnosis of PLC is a very important issue, which is the key to ensuring the normal and reliable operation of the PLC control system.

This article explores commonly used fault diagnosis methods. In the actual work process, various adverse factors on the PLC should be fully considered, and regular inspections and daily maintenance should be carried out to ensure the safe and reliable operation of the PLC control system.


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