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2.2.2.1 How to install the product in an EMC-correct way
•
Use shielded cables for external GENIbus. Connect the shield to
the cable clamp.
•
Connect the shield to the earth terminal inside the control
cabinet.
•
Do not twist shield ends, as this will destroy the shield effect at
high frequencies.
•
Ensure that the DIN rail has a good connection to functional
earth.
The module has been designed to ensure a good electrical
contact to the DIN rail.
2.3 Electrical connection
2.3.1 Connecting the power supply
WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before making any electri-
cal connections.
‐
Make sure that the power supply cannot be switched
on accidentally.
Changes or modifications not expressly approved by
Grundfos may void the user's authority to operate the
equipment.
1. Check that the supply voltage corresponds with the needed 24
VDC, and ensure that the polarity is connected correctly
according to the label on the product itself.
2. Connect the power cables and pump cables according to the
relevant electrical diagram.
3. Tighten the terminal screws to 0.5 Nm.
Connecting a wire to a terminal with spring clamps
6
2.3.2 Setting the termination resistor
The GENIbus termination resistor DIP switch SW1 has two bits
switches, SW1-1 and SW1-2.
SW1-2 is used for cutting the terminal impedance in and out.
SW1
1
ON DIP
1
2 3 4
1. Set the switches according to the table.
Status
SW1-1
Cut-in
-
Cut-out
-
Maximum cable length
Terminated cable
bit/s
m [ft]
1200-9600
1200 [4000]
19200
1200 [4000]
38400
1200 [4000]
2.3.3 Setting the address switches
If you connect more than one IO 241 module in the system, you
must set the SW2 address switch correctly. SW2 has four bits
switches, SW2-1, SW2-2, SW2-3 and SW2-4.
Slave address settings
SW2-1
SW2-2
SW2-3
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
2
ON
1 2
SW1-2
ON
OFF
Unterminated cable
m [ft]
1200 [4000]
500 [1700]
250 [800]
Slave ad-
SW2-4
dress
OFF
90, default
OFF
91
OFF
92
OFF
93
OFF
94
OFF
95
OFF
96
OFF
97
ON
98
ON
99
ON
100
ON
101
ON
102
ON
103
ON
104
ON
105
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