5 Installation at Site
39 of 132
Amacan P
5.4.1.5.2 Leakage inside the motor
DANGER
Incorrect monitoring of leakage electrode
Explosion hazard!
Danger of death from electric shock!
▷
Voltages must be < 30 V AC and tripping currents < 0.5 mA.
PE
K 1
9
K 1
9
8
Wiring of the electrode relay
(standard)
Wiring of the electrode relay (pump
sets with vibration sensor only)
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 fulfil the following requirements:
▪
Sensor circuit 10 to 30 V AC
▪
Tripping current ≤ 0.5 mA
Pump sets with vibration
sensors
A different wiring system is used for the electrodes of pump sets with vibration
sensors.
5.4.1.5.3 Mechanical seal leakage
Fig. 24:
Float switch
The chamber for mechanical seal leakage is equipped with a float switch (core
identification 3 and 4). The contact (maximum 250 V~/2 A) opens when leakage is
detected in the leakage chamber. Opening of the contact shall trigger an alarm
signal.
5.4.1.5.4 Bearing temperature
The lower bearing of the pump set is equipped with a bearing temperature sensor.
The sensor is a Pt100 resistance thermometer (core markings 15 and 16). It must 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 130 °C
▪
Cut-out of the pump set at 150 °C
