The functional diagrams describe the default input, output, programmable LED, and function-to-function connections of default configuration. The default connections can be viewed and changed with PCM600 according to the application requirements, if necessary.
The analog channels, measurements from CTs and VTs have fixed connections to the different function blocks inside the relay. Exceptions from this rule are the 12 analog channels available for the disturbance recorder function. These channels are freely selectable and a part of the disturbance recorder’s parameter settings.
The signal marked with 3I represents the three phase currents from the terminal side of the motor. The signal marked with 3IB represents the three phase currents from the neutral side of the motor. The signal Io represents the measured residual current, fed from either residually connected CTs or an external core balance CT or neutral CT, depending on application.
The signal marked with 3U represents the three phase system voltages on the bus. These inputs are connected in Delta, which are typically fed from open-delta (V connected) VTs from the system. When star connected VT is available in the system, the VT inputs in the IED are star connected and configuration setting is suitably changed. In addition, the signal marked with Uo represents the measured residual voltage via open-delta connected VTs.
The signal marked Usyn is measured from the VT on the terminal side of the motor. This signal is used to check synchronizing.
The relay offers six different settings groups which can be set based on individual needs. Each group can be activated or deactivated using the setting group settings available in the relay.
There are 16 programmable push buttons offered in the front panel of the unit. The relay offers six different settings groups which can be set based on individual needs.
Each group can then, be activated or deactivated by using a programmable button. In addition to this, the programmable button can be also used for emergency start and emergency stop, manual trigger of disturbance recorder, master trip lockout reset, circuit breaker control interlocking bypass, restart inhibit, and so on.