Mounting; Electrical Connection; Emc-Correct Installation - Grundfos IO 112 Montage- Und Betriebsanleitung

6.2 Mounting

IO 112 is prepared for mounting on a 35 mm DIN rail
(EN 50 022).
Fit the IO 112 module by hooking the top on the DIN
rail and clicking the bottom onto the rail.
Fig. 3 Mounting on DIN rail
The IO 112 module can be removed by pushing it
upwards and free of the DIN rail.
The installation must incorporate a circuit
breaker in order to switch off the phase
voltage on the terminals of pos. 10. See
fig. 1. It must be close to the IO 112
module and easily accessible for the
operator. It must be marked as circuit
breaker for IO 112.
The circuit breaker must be according to
IEC 60947-1 and IEC 60947-3.

6.3 Electrical connection

All terminals are rated for maximum 8 A. The termi-
nals 8, 9, 10 and 12 are for wire size AWG 28~12;
terminal 13 is for AWG 28~16.
Voltage rating of the individual terminals, see
14. Electrical data.
Note: If the PT function is not used, terminals P1 and
P2 must be connected by a jumper. See fig. 4.
P1 P2 P3 P4 P5
Fig. 4 Jumper between P1 and P2
The insulation between the cabinet in
which the module is fitted and the input
terminals for sensors must have a dialec-
tic strength of 2210 VAC, or the cabinet
must be connected to earth.
The terminals T1 and T2 (pos. 8) may be
connected to phase voltage. See fig. 1.
External controllers that are connected to
the IO 112 module via the RS485 connec-
tion must be according to IEC 60950-1
(USA: UL 60950-1).
6

6.3.1 EMC-correct installation

It is especially important to ensure an EMC-correct
installation of pumps with frequency converter.
The following rules must be observed:
• Connect the cable screen to earth.
• Do not twist screen ends, as this will destroy the
screen effect at high frequencies. Use cable
clamps as shown in fig. 5.
• It is important to ensure a good electric contact
from the mounting plate through the mounting
screws to the metal cabinet of the frequency con-
verter.
• Use toothed washers and a galvanically conduct-
ing mounting plate.
Note the insulating plastic
layer between screen and
sheath.
Fig. 5 Screen fixed with cable clamp