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Examples

Booster unit

Problem: no stop of the HYDROVAR

Parts to check Solution

• existing demand

• non return valve is not closed

• pre charge pressure in the pressure tank

• no correct settings of WINDOW and

RAMPHYSTERESIS

• shut down RAMP too slow

• suction line too long

• check pipes and valves

• change non return valve

• adjust according the diagram

• set WINDOW (ca.10%) and

RAMPHYSTERESIS (80-50%)

• set RAMP 2 to 4...15 sec.

• the MINIMUM FREQUENCY should be

activated for pressure increase at 0 demand

Control on constant flow

Problem: control fluctuations

Parts to check Solution

control characteristics are set to low

enlarger WINDOW and RAMPHYSTERESIS to

99% to control with RAMP 3 and 4

Circulating pump

Problem: oscillation of the motor speed

Parts to check Solution

control settings too fast

• increase RAMP 3 and 4: 100...200sec

• WINDOW (ca.20%) and

RAMPHYSTERESIS (ca.99%)

Problem: ACTUAL VALUE can't be hold

Parts to check Solution

Ramphysteresis too big RAMPHYSTERESIS: 90-99%

Submersible pumps

Problem: motor cables are too long

Solution: reduce SWITCHING FREQUENCY, BOOST: 10-20%

General

Problem: pressure fluctuations, analogue signal not constant

Solution:

• check cables and connection of the screen

• check earth connection of the Transmitter

• use screened cables

Brand	Xylem
Model	HYDROVAR HV2.1f
Category	Controller
Language	English

Xylem HYDROVAR HV2.1f User Manual

Table of Contents

Questions and Answers:

Xylem HYDROVAR HV2.1f Specifications

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