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9.4.3 Power Unit

The Power unit in its basic form, which is used as Basic Inverter in multi-pump systems or

as a simple soft starter in a single pump application, is fitted with two control terminal-

blocks.

HV 2.015/2.022 HV 4.022 / 4.033 / 4.040

HV 4.055 / 4.075 / 4.110

X1 Control Terminals – Power Unit

PTC PTC or Thermal switch

START/STOP (external release) when using a Basic Inverter

SL SOLO RUN

SOLO RUN

START/STOP_PTC

To ensure a save operation between the HYDROVAR and the motor if the HYDROVAR is

used as Basic Inverter, a motor-thermo-switch or PTC and an external on/off switch should

be connected to the power unit. They must be connected to X1/PTC in serial and will stop

the HYDROVAR in case of a failure! (Also a low-water switch or any other protective devices

can be connected to these terminals!)

If there aren’t connected any external protective devices or they are connected directly to

the Control Card when using a Master Inverter, bridge terminals X1/PTC, otherwise the

HYDROVAR can’t be started.

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ITT HYDROVAR Series Specifications

General