Io 113 Module - Grundfos SE Service Instructions Manual

1. check that the overall circuit resistance is between 250-750 Ω.
2. check that the insulation between the circuit and the stator housing is outside the range.
3. carry out similar measurements at the end of the power cable.

8.8 IO 113 module

The IO 113 module is the interface between a pump with analogue and digital sensors and the pump controller. The most important sensor
data are indicated on the front panel.
One pump can be connected to one IO 113.
With the sensors, IO 113 provides a galvanic separation between the motor voltage in the pump and the connected controller.
The IO 113 enables the following functions:
• overtemperature protection
• monitoring the sensors for analogue measurement of:
- motor temperature (with Pt100 installed in the windings)
- pump vibrations (with PVS3 vibration sensor
- stator insulation resistance
- bearing temperature (with Pt100 installed at the bearings)
- moisture in motor
• stopping the pump in case of alarm
• monitoring the pump through RS485 communication (Modbus or GENIbus).
Insulation resistance measurement
IO 113 measures the insulation resistance between a stator winding and ground:
• resistance above 10 MΩ = OK
• resistance between 10 MΩ and 1 MΩ = warning
• resistance below 1 MΩ = alarm.
30