Frequency Source Switching when using Constant Pressure Setup
Requirement:
A Constant Water Pressure Setup solution is required for a Solar Drive with Water Pump, but for maintenance purposes it is required, on an ad hoc basis, to override the Constant Water Pressure Setup and run the motor at a predefined speed (irrespective of pressure).
Solution:
Solar Drives offer a Frequency Source Switchover function which can be used to alternate between 2 different Frequency Sources.
To set this up, please follow the wiring and parameter suggestions as follows:
Wiring:
- PID: Connect PID between +24V and AI2 and bridge GND and COM
- Frequency Source Switch: Connect a Switch between DI3 and COM to be used to switch between Frequency Source X and Frequency Source Y
- ON/OFF Switch: “If Required” – connect an On/Off Switch between DI1 and COM (and set F0-02=1)
Parameter Settings:
- Set F0-03 = 8 (Main Frequency Source X = PID)
- Set F0-04 = 6 (Auxiliary Frequency Source Y = Multi-Function)
- Set F0-07 = 02 (Frequency Source Logic Selection = Switchover between X and Y)
- Set F4-02 = 18 (DI3 = Frequency Source Switchover)
- Set FA-00 = 0 (PID Setting Source = FA-01)
- Set FA-02 = 1 (PID Feedback Source = AI2)
- Set FA-04= 1000 (The PID Maximum Pressure that can be measured by the PID (1MPa / 10Bar = 1000)
- Set FA-28 = 1 (Set =1 if Sleep Function is required, otherwise keep = 0)
- Set F4-18 = 2 and F4-20 = 10 (to align with a 4-20mA feedback range)
- Set FA-01 = Set desired Target Pressure (Target Pressure as % of PID Feedback Range)
- Set F8-49 = Set desired WakeUp Frequency (must be set before setting F8-51)
- Set F8-50 = Set desired WakeUp Delay Time
- Set F8-51 = Set desired Sleep Frequency (must be set after setting F8-49 since it must be smaller than F8-49)
- Set F8-52 = Set desired Sleep Delay Time
- Set FC-00 = Set desired frequency to be used after switching to Frequency Source Y (as a % of the Maximum Frequency as set by F0-12)
