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To ensure safety operation between the HYDROVAR and the motor a motor-thermo-switch
or PTC should be connected to the power unit. Additionally this input can be used as an
external ON / OFF signal when using the HYDROVAR just as BASIC Inverter. Both the signals
must be connected to X1/PTC in series 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 is no use of this input, terminals X1/PTC have to be bridged, otherwise the
HYDROVAR will not start automatically.
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 fails itself, or in case the BASIC Inverter is just used as a simple soft-starter.
• By 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
(fixed speed) [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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