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Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

Products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, machinery, electronics, automobile manufacturing, tobacco, plastics machinery, electric power, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution and so on.

MITSUBISHI A1S65B-S1 Power supply module

The 505’s Overspeed Test function allows an operator to increase turbine speed above its rated operating range to periodically test turbine electrical and/or mechanical overspeed protection logic and circuitry. This includes the 505’s internal overspeed trip logic and any external overspeed trip device’s settings and logic. Figure 5-11 shows the screen that is displayed when the ‘Overspeed Test’ key is pressed from the Speed Control page. It shows the permissives required to be able to perform an overspeed test (in the case of a mechanical drive application the Generator Breaker Open is not shown)

The engine, turbine, or other type of prime mover should be equipped with an overspeed shutdown device to protect against runaway or damage to the prime mover with possible personal injury, loss of life, or property damage. The overspeed shutdown device must be totally independent of the prime mover control system. An overtemperature or overpressure shutdown device may also be needed for safety, as appropriate.

Overspeed Test Procedure 

(from the 505 display)  Be sure the generator breaker is open or if unit is a generator drive  Raise the Speed Set Point to the maximum governor setting  If desired, clear the ‘Highest Speed Reached’ value, to record the highest speed reached during this overspeed test. (Reset Max key)  This function has a safety timeout to insure the unit does not run in this mode unattended. Once the mode is entered, the user must begin to raise the speed within 30 seconds. As long as the user is adjusting the speed the timeout value will be reset.  Timeout value is shown, if it expires the test mode will be aborted and the unit will return to the maximum governor limit

 To perform an Internal Overspeed Test Press the Enable Int Test key and the above pop-up page will appear. An Alarm will be annunciated that indicates Overspeed Test Enabled  Put the Adjust button in Focus and use the ADJUST key to raise the speed above the normal Max Governor limit.  Once turbine speed reaches the 505’s internal OVERSPEED TRIP (rpm) setting, the 505 will TRIP the turbine

External Overspeed Test 

An external trip test is intended to be used to test the unit’s safety overspeed protection device (in many cases a Woodward ProTech). In this mode the 505 internal overspeed trip will be changed to be just an alarm and the 505 will allow the speed to continue increasing up to the Overspeed Test Limit (rpm). If the 505 speed OR the Setpoint reaches the Overspeed Test Limit it will TRIP  To perform an External Overspeed Test Press the Enable Ext Test key and the above pop-up page will appear. An Alarm will be annunciated that indicates Overspeed Test Enabled  Put the Adjust button in Focus and use the ADJUST key to raise the speed above the normal Max Governor limit.

 Once turbine speed reaches the 505’s internal OVERSPEED TRIP (rpm) setting, the 505 will trigger an alarm that this has been reached  If the timeout expires while the unit is above the Overspeed Trip setting, but below the Overspeed Test Limit, the 505 will Trip on Overspeed  If the Speed or the Setpoint reach the Overspeed Test Limit the 505 will issue a Trip