Italtecnica Sirio Entry 230 Instrucciones Para El Uso página 108

MASTER STATUS: when the device works as a MASTER it is sensitive
to pressure changes in the plant and thus capable of starting and
stopping the pump unit and modulating pump rpm in accordance with
water demands from the plant.
SLAVE STATUS: when the device works as a SLAVE two capital S
characters appear on the display bottom line; in this condition if the
pump is running the speed remains constant, while if the pump is
stopped its starting is inhibited even when the taps are opened.
OPERATION: at the time of power-on the first device that gets the control over the other
becomes the MASTER while the other functions as the SLAVE. When user services are opened
the MASTER device starts the pump and when the maximum rotation speed is reached and the
system pressure is lower than the preset Pmin value, it transfers control to the second inverter,
which becomes the new MASTER, while the first inverter becomes the SLAVE and its rotation
speed remains fixed. With the progressive closing of the user services the second device stops
the pump and control is again transferred to the first inverter, which will stop the electric pump
when the water demand is reduced to zero after complete closing of each user. After the
electric pump has been stopped MASTER status is again transferred to the other device to
ensure constant changeover of the pump that is started first. In the event of a fault or error on
one of the two inverters, the healthy device will automatically assume MASTER status and start
operating in stand-alone mode.
To activate the changeover function it is not necessary to set any parameters in the menu
because Sirio Entry automatically detects the presence of a secondary device once the electrical
connection has been made.
The Pmin and Pmax values set must be the same for both devices.
Installation and connection in twin
booster sets
INSTALLATION: install each Sirio Entry unit
on the pressure line of the corresponding
electric pump. Connect the outlet union of
each inverter to the delivery manifold without
interposing a check valve. Connect the
suction of the electric pumps to the common
intake manifold, interposing a check valve for
each pump to prevent it from emptying when
stopped. Sirio Entry is compatible with both
vertical and horizontal installation.
CONNECTION: the two Sirio Entry units are
connected by an unshielded 4x0.5 mm2 cable
as shown in the diagram beside. The
maximum cable length is 100 cm including
stripped ends. Customers can order a
preassembled connection cable with terminals
and cable numbering - Ref. SR-CBL4X05-100.
If no cable is connected the device will
function in stand-alone mode.
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