Power Electronics V5 Series Getting Started Manual page 28

Fault F25 LOW PRESSURE
Description Low pressure protection.
Possible Cause The V5 is running and the pressure switch opens for longer than the time entered in
screen G16.5.
Action Check hydraulic installation (broken pipes). Check pump has got water. Check pressure
switch. Check proper wiring from pressure switch to V5 digital input 2. The V5 will require
resetting on the display or via D INPUT 5 if configured for 2 wire start/stop. Check
parameter setting is done according to application requirements.
Fault F26 FLOW SWITCH
Description No flow protection.
Possible Cause The flow switch is ignored for the time set in screen G16.7 on receipt of a valid start signal.
After this time the V5 will trip if no flow is indicated for longer than the time set in screen
G16.8. No water in the pump.
Action Check proper pump water supply. Check flow switch. Check proper wiring form flow switch
to V5 digital input 3. The V5 will require resetting on the display or via D INPUT 5 if
configured for 2 wire start/stop. Check parameter setting is done according to application
requirements.
Fault F27 DEEP WELL PROBE
Description Low level protection
Possible Cause The well probe controller (or other level controller) detects a lack of water. The tank or
pump has no water.
Action Check water level. Check hydraulic installation. Check level switch. Check proper wiring
from deep well probe flow controller to V5 digital input 4. The V5 will not reset unless the
low water fault has been cleared (D INPUT 4 closed). Check parameter setting is done
according to application requirements.
POWER ELECTRONICS V5 Operation Instructions V5IM01BI
27