Location; Enclosure Class; Terminals; Mounting - Grundfos IO 351 Montage- Und Betriebsanleitung

3.1 Location

IO 351 is designed for indoor installation. For
outdoor installation the IO 351 must be mounted in a
suitable panel.

3.2 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.

3.3 Terminals

All terminals are suitable for conductors of 0.5 to 2.5
mm² or AWG 20-13.

3.4 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 13. 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. 5.
3. Connect the conductors, see 8. 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.
Fig. 5 Mounting on DIN rail
8

3.5 EMC-correct installation

IO 351 is usually mounted in a panel also containing
a CU 351 and frequency converters, contactors and
other power equipment. In order to ensure a faultless
function, it is very important to install the electronic
modules in an EMC-correct way:
• Use screened cables for GENIbus. Connect the
screen to the cable clamp of the module forward
of the terminals AA, YY and BB.
Fig. 6 Screen fixed with cable clamp
Any isolating plastic tape between screen and
sheath must be removed before mounting the cable
in the cable clamp.
Signal conductors for digital and analog inputs and
outputs should be screened, i.e. run the screen all
the way to the IO 351 and connect it to frame with for
instance a cable clamp.
Alternatively, the signal conductors in the panel may
be unscreened if the panel is divided into a power
and a low-voltage area. Unscreened signal
conductors must not run in the power area, but
exclusively in ducts in the low-voltage area.
• Do not twist screen ends, as this will destroy the
screen effect at high frequencies. Use cable
clamps.
• The module construction ensures a good
electrical contact to the DIN rail. The DIN rail
must therefore have a good connection to
functional earth. If the module is mounted without
a DIN rail by means of the four mounting holes
(pos. 6), there must be a connection to functional
earth through the fitting (pos. 3). See fig.
• Use toothed washers and galvanically conducting
mounting plates.
1 or 2.