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External panel

max. 5 fixed

speed units

External panel

3.2.3 Cascade Relay

One pump is fitted with a HYDROVAR “Master Inverter” and up to 5 full speed slave pumps

can be switched ON and OFF on demand. For this purpose an additional relay card with 5

relays is used in the “Master Inverter”. Each Relay can be activated or deactivated

depending on how many pumps are connected.

Basically an external panel is needed for all the motor relays, because the relays in the

HYDROVAR can’t switch the pumps directly as they are just used as switch contacts.

Also an automatic change over of the fixed speed pumps to provide even wear and achieve

even operating hours is possible in this mode.

This configuration would be a simple alternative compared with other solutions using

VFD’s on each pump, but in any case care has to be taken due to the lower operating

safety of such a system.

Application Example

Booster sets up to 6 pumps where only one pump is speed controlled by the HYDROVAR

and the others are fixed speed (1 HYDROVAR Master Inverter+5 fixed speed). This should

be the standard configuration when the additional “Relay Card” is used.

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ITT HYDROVAR Series Specifications

General