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9.4.3.1 Solo Run
The Terminals X1/SL are used to release a Basic Inverter (when used in a multi-pump
application) when the communication to the Master Inverter fails, or even the Master
Inverter itself fails, or in case the Basic Inverter is just used as simple soft-starter.
• At opened contact X1/SL the HYDROVAR works in standard operation. So a Basic Inverter
only starts up, if it is released and requested by a Master Inverter via the serial RS485-
Interface.
• When contact X1/SL is closed the HYDROVAR starts up to pre-selected MAX. FREQUENCY
[0245] using Ramp 1 and 2 and even the Fast Ramps FminA and FminD.
(X1/PTC must be closed too - all external connected safety devices are still active)
A manual start up is always possible, even the HYDROVAR is equipped with a Control Card.
For example, if it is necessary because of safety reasons to operate the Basic Inverters when
the Master Inverters fail, it is possible to equip this terminal with an AUTO/MANUAL switch.
Connection Example
External switch to enable the
SOLO RUN
for example:
External release or
Low water switch
PTC or Thermo-switch
(mounted in the motor terminal box)
Recommended connections of external protective devices:
Basic Inverter:
PTC or Thermal switch X1/PTC
External release X1/PTC
Low water switch X1/PTC
Placed on the Power Unit
Master Inverter:
PTC or Thermal switch X1/PTC Placed on the Power Unit
External release X3/7-8
Low water switch X3/11-12
Placed on the Control
Card
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