Procedure After Switching On The Power Supply During Initial Commissioning - Wilo Yonos GIGA2.0-I Einbau- Und Betriebsanleitung
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9.2
Procedure after switching on the
power supply during initial com-
missioning
152
CAUTION
Destruction of the differential pressure sensor!
• Never vent the differential pressure sensor!
NOTICE
• Always keep to the minimum pressure!
•
To avoid cavitation noises and damage, a minimum inlet pressure must be guaranteed at
the suction port of the pump. The minimum inlet pressure depends on the operating
situation and the pump's duty point. Accordingly, the minimum pressure must be de-
termined.
•
The main parameters for defining the minimum inlet pressure are the NPSH value of the
pump at its duty point and the vapour pressure of the fluid. The NPSH value can be
found in the technical documentation of the respective pump type.
NOTICE
When pumping from an open tank (e.g. cooling tower), ensure that there
is always a sufficient liquid level above the pump's suction port. This pre-
vents the pump from running dry. The minimum inlet pressure must be
observed.
As soon as the power supply is switched on, the display starts. This can take a few seconds.
After the start-up process has been completed, settings can be configured (see "Control
settings" [" 160] section).
At the same time, the motor starts running.
CAUTION
Dry running will destroy the mechanical seal! It may cause
leakage.
• Ensure that a dry run of the pump is not possible.
Preventing the motor from starting when the power supply is switched on during initial
commissioning:
A cable jumper is set at the digital input DI1 in the factory. DI1 is factory-set as EXT. OFF is
activated.
To prevent the motor from starting during initial commissioning, the cable bridge must be
removed before the power supply is switched on for the first time.
After initial commissioning, the digital input DI1 can be set as required via the initialised
display.
If the digital input is switched to inactive, the cable bridge does not have to be set again to
start the motor.
When the digital input DI1 is reset to the factory setting, it is active again. The pump will
not start without the cable bridge. See "Application and function of the digital control in-
put" [" 177] section.
Installation and operating instructions • Wilo-Yonos GIGA2.0-I/-D • Ed.01/2023-03
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