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Electrical Installation and Wiring
X1 Control terminals – power unit
PTC Terminals have Jumper between them.
Remove jumper and attach Thermistor leads
SL SOLO RUN (Hand Mode)
SL
SOLO RUN (Hand Mode)
SL
PTC
START/STOP via Thermistor
PTC
To protect the motor against thermal overload, a thermistor should be connected to the drive at
the terminals labeled PTC. This input can also be attached to an external ON / OFF switch when
using the HYDROVAR as a Basic drive. Either the thermistor or on/off switch must be closed
between X1/PTC or the drive will stop running! A low water switch or other protective device can
also be connected to these terminals!
If these terminals are not used, they must be jumpered, otherwise the HYDROVAR will not
start.
8.4.3.1 Solo Run (Hand Mode)
Terminals X1/SL are used to enable a Basic drive (when used in a multi-pump applica-
tion) when the communication from the Master drive fails, or if the Master drive itself
fails, or to use the Basic drive as a soft-starter.
• If the circuit is open between the two X1/SL terminals, the HYDROVAR works in stan-
dard operation as controlled by a Master drive.
• When contact between the two X1/SL terminals is closed, (contact between X1/PTC
terminals must also be closed), the HYDROVAR starts up to the pre-selected Max Fre-
quency, (set via fixed speed, (parameter 0245) using ramps 1 and 2 or the fast ramps
FminA and FminD).
A manual override switch can be placed between the 2 X1/SL terminals. When the
circuit is open, the drive will work with the Master. When it is closed, the drive will
operate manually.
X1
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