F.4 Bypass Operations by N2The drive operations that can be performed by N2 communication depend on drive parameter settings. This section explainsthe functions that can be used and related parameter settings.u Observing the Bypass OperationA controller can perform the following actions with N2 communications at any time regardless of parameter settings (exceptfor Z3-oo parameters):• Observe drive status and drive control terminal status from a controller• Read and write parameters• Set and reset faults• Set multi-function inputs.Note: Input settings from the input terminals So and from N2 communications are both linked by a logical OR operation.u Controlling the BypassSelect an external reference and adjust the parameters in Table C.1 accordingly to start and stop the drive or set the frequencyreference using N2 communications.Table F.1 Setting Parameters for Bypass Control from N2Reference Source Parameter Name Required SettingExternal Reference 1 Z1-07 Frequency Reference Select 2Z1-08 Run Command Select 2n Z1000 Bypass FunctionsEach of the following functions must be enabled during start-up:Start and Stop the BypassSet the Run Forward Command (BO 1) to run the in the forward direction. Set the Run Reverse Command (BO 2) to run thein the reverse direction. Run/Stop Monitor (BI 1) shows the current run status. Forward/Reverse Monitor (BI 2) shows thecurrent direction.NOTICE: Damage to Equipment. Improper motor direction may damage HVAC equipment if parameter b1-04, Reverse Enable, is set to 0(Enable).Lock the Z1000 Bypass PanelThis function is not supported in the Z1000 Bypass.Digital InputsMulti-Function Input S3 (BO 5) through Multi-Function Input S7 (BO 9) are physical digital inputs on the bypass. They canbe set either by external devices, such as limit or pressure switches, or by the network. Their function depends on how thebypass has been programmed. The multi-function input status can be monitored through Multi-Function Input 3 Monitor (BI15) through Multi-Function Input 7 Monitor (BI 19). The Multi-Function Input # Monitor state is the logical OR of the serialcommand value (BO 5 through BO 9) and the state of the external connection.Note: The multi-function inputs can be set by both external devices or over the network. Use caution when connecting the multi-function inputsto external devices to ensure correct system operation.Digital OutputsMulti-Function Output 7 (BI 10) through Multi-Function Output 9 (BI 12) are physical digital outputs on the bypass. Theirfunction depends on how the bypass is programmed. Refer to the Z1000 Bypass Technical Manual section on Multi-FunctionOutputs (Z2-23 through Z2-25) for detailed information on the use and programming of the multi-function outputs.Loop GainPI Proportional Gain (AO 4) and PI Integral Time (AO 5) are the gain and integral time parameters used by the Z1000. TheZ1000 PI loop is structured differently than the Metasys loop. Refer to the Z1000 Bypass Technical Manual section on PI forinformation on Z1000 PI loop functions.F.4 Bypass Operations by N2430 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
