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Jack Nally | Support Engineer
BHVAC drives such as the ACH580 are commonly used as stairwell pressurisation fans in the event of an emergency. This Tech Tip will show you the basic parameter set up for a simple application. The purpose of a stairwell pressurisation fan is to keep smoke out of exit routes by maintaining positive pressure. Below is a depiction of the setup.In this example, a 0-10V pressure transducer is input into AI2, and a switch into DI6 to enter override mode. Relay 2 has been set up as a ‘Running’ relay, and relay 3 configured as a fault relay. When the drive enters fire mode, it uses PID Set 1 as its reference and will maintain a constant setpoint of the user’s choosing.Navigate to the complete list of parameters by pressing Menu > Parameters > Complete List.
GROUP 10 (Standard DI, RO)10.27: RO2 sourceSupervision 110.30: RO3 sourceFault
GROUP 12 (Standard AI)12.25: AI2 Unit SelectionV12.27: AI2 min0.00012.28: AI2 max10.00012.29: AI2 Scaled at AI2 Min0.00012.30: AI2 Scaled at AI2 MaxPressure Transducer Max
GROUP 20 (Start / Stop / Direction)20.41: Start interlock 1Not Used
GROUP 32 (Supervision)32.05: Supervision 1 FunctionHigh32.06: Supervision 1 ActionNo Action32.07: Supervision 1 SignalCurrent32.09: Supervision 1 Low0.5A32.10: Supervision 1 High0.5A32.07: Supervision 1 SignalCurrentGROUP 40 (Process PID Set 1)40.07: Process PID Operation ModeOn40.08: Set 1 Feedback 1 SourceAI2 Scaled40.16: Set 1 Setpoint 1 SourceInternal Setpoint40.19: Set 1 Internal Setpoint Sel1Selected40.21: Set 1 Internal Setpoint 1TBD by Commissioner40.32: Set 1 GainTBD by Commissioner40.33: Set 1 Integration TimeTBD by Commissioner40.34: Set 1 Derivation TimeTBD by CommissionerGROUP 70 (Override)70.02: OverrideOn70.03: Override activation sourceDI670.04: Override reference sourceProcess PID Set 170.05: Override directionForward70.06: Override Freq__ Hz
The information displayed on the home screen of the keypad can be changed to show any parameter.
From the home screen press the Options key and then press the Edit Home View option. Next, select the line you want to change, press Edit, then edit the parameter. Pick the parameter you wish to display from the complete list and press Save.