Grundfos SE Instrucciones De Instalación Y Funcionamiento página 12

Pt1000 temperature sensor
The Pt1000 temperature sensor is available as an accessory or
as an FPV (Factory Product Variant) option.
The Pt1000 sensor is primarily used for the monitoring of bearing
temperature, but it can also be used in the stator.
In case of overheating caused by wear, lack of lubricant, etc., the
Pt1000 sensor will trip an alarm and disconnect the power supply
at a preset temperature.
The bearing temperature monitoring system is only
available as an option.
The sensor resistance values are as follows:
• 1000 Ω at 32 °F (0 °C)
• 1385 Ω at 212 °F (100 °C)
• approximately 1078 Ω at room temperature.
The temperature limits are as follows:
• 194 °F (90 °C): warning for bearing temperature
• 266 °F (130 °C): pump stop caused by high bearing
temperature
• 302 °F (150 °C): pump stop caused by high stator
temperature.
In FM-approved pumps, the maximum acceptable
alarm temperature in the bearing sensors is 212 °F
FM
(100 °C) for the lower bearing (shaft end) and 248 °F
(120 °C) for the upper bearing.
Checking after installing the pump
1. Using a multimeter, check whether the resistance at room
temperature [68 °F (20 °C)] is approximately 1078 Ω.
2. Using a multimeter, check whether the insulation between
circuit and stator housing is outside the scale (not measurable

).
3. Carry out similar measurements at the end of the power
supply cable.
During pump check, the Pt1000 sensor must be connected to a
recording device.
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Pump vibration sensor (PVS3)
The PVS3 sensor monitors the vibration level of the pump in
order to protect the pump and the pipe system against damage.
A change in the vibration level is an indication of an abnormal
situation. The reason for this can be a clogged impeller, worn
bearings, a closed outlet valve etc., indicating that a service
inspection must be carried out before the pump or the pipe
system is damaged.
SM 113
SM 113 is used for collecting and transferring sensor data. SM
113 works together with IO 113 through power line
communication using the Grundfos GENIbus protocol.
SM 113 collects data from the following devices:
• 3 current sensors, 4-20 mA
• 3 Pt1000 thermal sensors
• 1 PTC thermal sensor
• 1 digital input.
IO 113
IO 113 forms the interface between a Grundfos sewage and
wastewater pump with analog and digital sensors and the pump
controller. The most important sensor data are indicated on the
front panel.
One pump can be connected to IO 113.
Together with the sensors, IO 113 forms a galvanic separation
between the motor voltage in the pump and the controller
connected.
IO 113 enables the following functions:
• protecting the pump against overtemperature
• monitoring the sensors for analog measurement of:
– motor winding temperature
– pump vibrations
– stator insulation resistance
– bearing temperature
– moisture in the motor
• stopping the pump in case of alarm
• remotely monitoring the pump via RS485 communication
(Modbus or GENIbus).
Measurement of stator insulation resistance
IO 113 measures the insulation resistance between a stator
winding and earth:
• resistance above 10 MΩ = ok
• resistance between 10 MΩ and 1 MΩ = warning
• resistance below 1 MΩ = alarm.