Wilo Yonos GIGA2.0-I Installation And Operating Instructions Manual page 146

en
9.2 Procedure after switching on the
power supply during initial com-
missioning
146
Commissioning
DANGER
Danger of personal injury and material damage due to extremely hot or
extremely cold pressurised fluid!
Depending on the temperature of the fluid, when the venting device is opened com-
pletely, extremely hot or extremely cold fluid may escape in liquid or vapour form.
Fluid may shoot out at high pressure depending on the system pressure.
• Always exercise caution when opening the venting device.
• Protect the electronic module from any water escaping when venting.
Prime and vent the unit correctly.
1. To do this, loosen the air vent valves (Fig. I, Item 28) and vent the pump.
2. After venting the pump, tighten the air vent valves again so that no more water
can escape.
CAUTION
Destruction of the differential pressure sensor!
• Never vent the differential pressure sensor!
NOTICE
• Always keep to the minimum pressure!
ƒ
To avoid cavitation noises and damage, a minimum inlet pressure must be guaran-
teed 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 determined.
ƒ
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 prevents 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" [} 154] 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 con-
trol input" [} 171] section.
WILO SE 2022-05