Connecting The Mcb 114 Sensor Input Module; Emc-Correct Installation - Grundfos CUE Series Installation And Operating Instructions Manual

6.5 Connecting the MCB 114 sensor input module

The MCB 114 is an option offering additional analog inputs for the
CUE.
6.5.1 Configuration of the MCB 114
The MCB 114 is equipped with three analog inputs for these
sensors:
• One additional sensor 0/4-20 mA. See section 10.7.13 Sensor
2 (3.16).
• Two Pt100/Pt1000 temperature sensors for measurement of
motor bearing temperature or an alternative temperature, such
as liquid temperature. See sections 10.7.18 Temperature
sensor 1 (3.21) and 10.7.19 Temperature sensor 2 (3.22).
When the MCB 114 has been installed, the CUE will automatically
detect if the sensor is Pt100 or Pt1000 when it is switched on.
6.5.2 Wiring diagram, MCB 114
1 2 3 4 5
+
-
+
Fig. 25 Wiring diagram, MCB 114
Terminal Type Function
1 (VDO) +24 V out Supply to sensor
2 (I IN) AI 3 Sensor 2, 0/4-20 mA
3 (GND) GND Common frame for analog input
4 (TEMP)
AI 4 Temperature sensor 1, Pt100/Pt1000
5 (WIRE)
6 (GND) GND Common frame for temperature sensor 1
7 (TEMP)
AI 5 Temperature sensor 2, Pt100/Pt1000
8 (WIRE)
9 (GND) GND Common frame for temperature sensor 2
Terminals 10, 11 and 12 are not used.
1 1 1
6 7 8 9
0 1 2

6.6 EMC-correct installation

This section gives guidelines for good practice when installing the
CUE. Follow these guidelines to meet EN 61800-3, first
environment.
• Use only motor and signal cables with a braided metal screen
in applications without output filter.
• There are no special requirements to supply cables, apart
from local requirements.
• Leave the screen as close to the connecting terminals as
possible. See fig. 26.
• Avoid terminating the screen by twisting the ends. See fig. 27.
Use cable clamps or EMC screwed cable entries instead.
• Connect the screen to frame at both ends for both motor and
signal cables. See fig. 28. If the controller has no cable
clamps, connect only the screen to the CUE. See fig. 29.
• Avoid unscreened motor and signal cables in electrical
cabinets with frequency converters.
• Make the motor cable as short as possible in applications
without output filter to limit the noise level and minimise
leakage currents.
• Screws for frame connections must always be tightened
whether a cable is connected or not.
• Keep main cables, motor cables and signal cables separated
in the installation, if possible.
Other installation methods may give similar EMC results if the
above guidelines for good practice are followed.
Fig. 26 Example of stripped cable with screen
Fig. 27 Do not twist the screen ends
Controller
Fig. 28 Example of connection of a 3-conductor bus cable with
screen connected at both ends
Controller
Fig. 29 Example of connection of a 3-conductor bus cable with
screen connected at the CUE (controller with no cable
clamps)
CUE
CUE
11