Xylem hydrovar Instruction Manual

74
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 uctuations, analogue signal not constant
Solution: • Check cables and connection of the screen
• Check earth connection of the transmitter cable
• Use screened cables
FAILURE MESSAGES

Xylem hydrovar Specifications

General

Frequency	50/60 Hz
Control type	Variable speed drive
Protection class	IP55
Communication protocols	Modbus
Relative Humidity	5% - 95% (non-condensing)
Altitude	Up to 1000 m without derating
Input voltage	200-690 V AC
Storage Temperature	-25°C to +70°C (-13°F to 158°F)