Three series-connected thermistors (PTC) at terminals 10 and 11 monitor the winding
temperature. Use a thermistor tripping unit with manual reset.
5.4.1.3.2 Leakage inside the motor
PE
K 1
9
Wiring of the electrode relay
(standard)
Position of the electrodes in the motor housing
Electrodes fitted inside the motor monitor the winding and connection space for
leakage. Both electrodes are connected in parallel (core identification 9). They must
be connected to an electrode relay. Tripping of the electrode relay must result in the
pump set cutting out.
The electrode relay (K1) must meet the following requirements:
▪
Sensor circuit 10 to 30 V AC
▪
Tripping current 0.5 to 3 mA
(equivalent to a tripping resistance of 3 to 60 k
Ω)
5.4.1.3.3 Mechanical seal leakage
The chamber for mechanical seal leakage is equipped with a leakage sensor (core
identification 6 and 7). Tripping of the electrode relay must result in the pump set
cutting out.
The electrode relay must meet the following requirements:
▪
Sensor circuit 10 to 30 V ~
▪
Tripping current 0.5 to 3 mA
(equivalent to a tripping resistance of 3 to 60 k
Ω)
5.4.1.3.4 Bearing temperature
The lower bearing of the pump set is equipped with a bearing temperature sensor.
This sensor is a PT100 resistance thermometer. It has to be connected to a
temperature control device with a PT100 input and 2 separate outputs for two
different switching points (sensor circuit maximum 6 V/2 mA).
Set the following limits:
▪
Alert at 266 °F (130 °C)
▪
Cut-out of the pump set at 302 °F (150 °C)
As an option, the upper bearing can also be equipped with a temperature sensor.
The connection and settings are identical with the above. Check in the data sheet
whether the pump set features temperature monitoring of the upper bearing.
Fig. 10: Leakage sensor
5 Installation at Site
24 of 68
Amacan P
