3.1 Type key
Example: IO 3 5 1 B
Code Meaning
IO Input-output unit
35 Controller series
1 Model number
A For pumps with fixed speed
B
For pumps with fixed speed and pumps
controlled by external frequency convert-
ers or as input-output module
4. Installation
IO 351 is only intended for factory wiring.
Before installation check that the
• variant corresponds to the one ordered.
• IO 351 is suitable for the supply voltage and
frequency on the installation site.
• IO 351 has not been damaged during
transportation.
WARNING
Electric shock
Death or serious personal injury
‐ Before installing the IO 351, make sure
that the electricity supply has been
switched off and that it cannot be acci-
dentally switched on.
The installation must be carried out by authorized
personnel in accordance with local regulations.
All safety regulations must be observed on the
installation site.
WARNING
Electric shock
Death or serious personal injury
‐ The terminals L and N as well as 76-81
and 82-89 may be connected to dan-
gerous contact voltage. External con-
trol voltage from other groups may oc-
cur.
WARNING
Electric shock
Death or serious personal injury
‐ All wires to units outside the control
panel must be of the type H05VV-F ac-
cording to CENELEC HD21 (to avoid
injury from touching wires).
WARNING
Electric shock
Death or serious personal injury
‐ The installation must incorporate a cir-
cuit breaker in order to switch off the
mains supply. It must be close to the
IO 351 and easily accessible for the
operator. It must be marked as circuit
breaker for IO 351. The circuit breaker
must be according to IEC 60947-1 and
IEC 60947-3.
WARNING
Electric shock
Death or serious personal injury
‐ The terminals are only separated with
basic insulation. Therefore, do not con-
nect a PELV circuit to a terminal adja-
cent to a terminal connected to live
voltage.
‐ PELV circuits and live wires must be
separated with double or reinforced in-
sulation.
4.1 Location
IO 351 is designed for indoor installation. For outdoor
installation the IO 351 must be mounted in a suitable
panel.
4.2 Enclosure class
In order to reduce the external pollution level to
maximum 2, the IO 351 must be installed in a
protecting environment with minimum IPX4 enclosure
according to IEC 60529. The cabinet must be of a
flame-retardant material.
4.3
Terminals
All terminals are suitable for conductors of 0.5 to 2.5
mm² or AWG 20-13.
4.4
Mounting
IO 351 is prepared for mounting on a 35 mm DIN rail
(EN 50022). Recommended height: 7.5 mm.
Module dimensions and minimum clearance above
and under the module, see 14. Dimensions.
1. Fit the IO 351 by hooking the top on the DIN rail
and holding the bottom against the rail.
2. Push the locking tabs (pos. 1) into the module as
shown in fig. Mounting on DIN rail.
3. Connect the conductors, see 9. Overview of
inputs and outputs.
If the modules are mounted vertically, it is
recommended to fit an end stop on the DIN rail below
the lowest module.
8
English (GB)
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