ABB VM1 Installation And Service Instructions Manual
Also see for VM1: Installation and service instructionsManualInstruction manualInstruction manual
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Contents
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15123125.3. Interlocks/protection againstmalfunctionA series of interlocks is provided to prevent incorrectoperations and/or malfunctions. The interlocks are thefollowing:• the withdrawable truck can only be moved from the test/isolated position to the service position (and vice versa) ifthe circuit-breaker is open (this means that first of all thecircuitbreaker must be opened).• the circuit-breaker can be closed if the withdrawable truck isexactly in the defined test position or in the service position(electric interlock).• the circuit-breaker can be opened manually in the serviceor test position when it is not powered, but it cannot beclosed.• the switchgear is provided with devices which only allowconnection and disconnection of the plug connector(Secondary disconnects Fig. 4) (Fig. 7) in the test/ isolationposition.Any detailed information regarding additional interlocks,e.g. in connection with the earthing switch operatingmechanism, is given in the specific order documentation.ModifiCation to inteRloCkS Can ReSult inhazaRdouS ConditionS to PeRSonnel andequiPMent. do not oveRRide, by PaSS oRadjuSt inteRloCkS.dangeRinterlocksThe VM1/A/P circuit-breaker contains a number of interlocks.A description of each interlock follows as encountered duringracking of the circuit-breaker into the compartment.Modification to interlocks may result in serious bodilyinjury or death.interference blocking: A mechanical plug interferenceblocking in the circuit-breaker compartment prevents underrated circuit-breakers from being inserted into higher ratedcompartments. The code plate rating includes continuouscurrent, interrupting current, close and latch capability, andmaximum voltage.fig. 7afig. 7b |
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