Wio Sensor; Starting Up The Product - Grundfos S Serie Manual Del Usuario

The moisture switches are hardwired from the pump to IO 113, or a
similar controller. They open if moisture is detected and break an
electric circuit. This generates both a hardware and a software
alarm in IO 113, and the alarm relay opens.
The maximum switching current on the moisture switch is 6 A.
7.5.3 Pt100
Pumps are equipped with Pt100 sensors in the stator windings, in
the upper- and in the lower bearing bracket.
Pt100 makes an analog measurement from 32-356 °F (0-180 °C.)
The value is measured by SM 113 and transferred to IO 113
through serial communication.
If the pump does not have an SM 113, hardwire the Pt100 sensors
out of the pump and connect them to an external unit. If the pump
has an SM 113, connect the Pt100 sensors to an SM 113. No
external unit is required.
The maximum alarm temperatures are indicated in the table below:
Alarm temperatures
Winding
Pump range
temperature
[°F (°C)]
72 302 (150)
74 302 (150)
78 302 (150)

7.6 WIO sensor

In case of overheating, the Pt100 sensors trip an alarm
and cut off the power supply at a preset temperature. The
FM
maximum acceptable alarm temperature is indicated in
the table above.
Lack of oil may cause overheating and damage to the
mechanical shaft seals. The WIO sensor in the oil
chamber trips the alarm if the oil quality or quantity is
inadequate.
The normal working temperature of the shaft seal is
approximately 140 °F (60 °C). The WIO sensor stops the
pump before the shaft seal could overheat, and keeps the
temperature within T4 class.
Do not use Shell Ondina X420 oil without emulsifier
detergent in a pump fitted with a WIO sensor.
The oil chamber is filled with oil acting as lubricant and coolant for
both mechanical seals. The WIO sensor measures the water
content in the oil chamber:
• 0-20 % water in the oil is ok
• water content outside the measuring range causes a warning
• too low oil level causes an alarm.
The sensor consists of a plate capacitor, which is immersed in the
oil and measures the electronic circuit emitting a 4-20 mA
proportional current signal.
For more detailed information, see the installation and operation
instructions or visit Grundfos Product Center at www.grundfos.com.
Upper Lower
bearing bearing
[°F (°C)] [°F (°C)]
248 (120) 212 (100)
248 (120) 248 (120)
248 (120) 248 (120)

8. Starting up the product

Start the pump by using either direct-on-line (DOL) or star-delta
(Y/D) starting. The selection of starting method depends on several
considerations of usage and main power supply.
In case of star-delta starting, keep the switching transient
time to a minimum to avoid high transient torques.
Use a time relay with a switching time of maximum 50 m or
according to the manufacturer's specifications.
The wiring diagrams for direct-on-line starting and star-delta starting
are shown in fig. Direct-on-line starting and fig. Star-delta starting.
See also the wiring diagram for sensors in fig. Wiring diagram for
sensors.
L1
W2
U1 V1 W1
Direct-on-line starting
L1
W2
U1 V1 W1
Star-delta starting
Pos. Description
D Control cable
L2 L3 PE
U2 V2
PE
M
3
L2 L3 PE
U2 V2
PE
M
3
21