Xylem IM223 R04 Hydrovar Pump Control - Manual (Page 7)

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Section 3
3.1 Hardware Configurations
The HYDROVAR variable speed drive consists of two separate components: the power unit and the control card.
In its basic configuration (consisting of only the power unit) the HYDROVAR can be used as a Basic Inverter. In
that configuration the HYDROVAR can be used as a sequence pump in a multi pump system, or as a simple soft
starter for single pump applications.
By extending this Basic controller with the additional control card, the HYDROVAR is able to work in different
modes and can be used for multipump applications.
Three types of drives are available. They are each capable of different levels of control. They are:
Master controller:
• Full variable speed controller of itself in a single pump configuration, with more features than the Single
controller
• Full variable speed control of the attached motor and up to 7 additional Master or Basic controllers.
• Full variable speed control of the attached motor and on/off, fixed speed control of up to 5 additional pumps.
(This requires an additional relay card.)
Basic controller:
• Single pump soft start control
• Full variable speed control when connected to a Master controller
single controller:
• Full variable speed control of a single pump with fewer features than the Master controller
3.2 Modes of operation
3.2.1 actuator (for single pump operation only!)
In this mode the HYDROVAR operates as an actuator with external speed signal or switching between 2
programmed frequencies by using the corresponding digital input. For this application the HYDROVAR
operates like a standard frequency converter when an external controller is used.
note
This mode can only be programmed with a Master or Single controller, and is for single pump systems
only.
3.2.2 controller
This mode should be selected if only one HYDROVAR pump is in operation and there is no connection to
any other HYDROVAR via RS485 interface.
→ Typical single pump operation
3.2.3 cascade relay
One pump is fitted with a HYDROVAR Master controller and up to 5 fixed speed pumps can be switched ON
and OFF on demand. For this purpose an additional Relay Card with 5 relays is used in the Master controller.
Separate motor starters are needed for each motor relay, because the relays in the HYDROVAR are control
contacts only.
Lead/Lag switching of the fixed speed pumps to provide even wear and achieve even operating hours can
be programmed in this mode.
This configuration is a cost effective alternative compared with other solutions using VFD’s on each pump,
but additional equipment is required, and you only have fixed speed control of the pumps.
product oVerVieW