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Failure Messages and Maintenance
Control on Constant Flow
Problem: Control Fluctuations
Cause: Check:
• Increase WINDOW [0310] and set
Control characteristics are set too low HYSTERESIS [0315] to 99% to control with
RAMP 3 and 4.
Circulating Pump
Problem: Oscillation of the motor speed
Cause: Check:
• Increase RAMP 3 [0225] and 4 [0230]:
Control settings too fast
100...200sec.
• WINDOW [0310] (20%) and HYSTERESIS [0315]
(99%).
Problem: ACTUAL VALUE can't be maintained
Cause: Check:
HYSTERESIS is set too big HYSTERESIS [0315]: 90-99%
General
Problem: Pressure fluctuations, analogue signal not constant
Solution: • Check cables and connection of the screen
• Check earth connection of the transmitter cable
• Use screened cables
Section 11 – Maintenance
The HYDROVAR does not require any special maintenance. However, the cooling fan and the vents should
be free of dust. Also the temperature around the unit should be checked from time to time.
All modifications must be done by qualified personnel! For mounting and repairs, only qualified service
technicians should attempt.
Disconnecting:
The HYDROVAR must be disconnected from the power supply for at least 5 minutes before any work can
be carried out. Consider pump and motor instructions. Always wear your personal protection equipment.
For further information, please contact your distributor!
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