5.4.1.6
Leakage inside the motor
PE
K 1
9
B2
B2
a)
b)
Fig. 4: a) Wiring of the electrode relay and b) Position of the electrode in the motor
housing
An electrode (B2) fitted inside the motor monitors the winding and connection space
for leakage. This electrode must be connected to an electrode relay (core marked 9).
Tripping of the electrode relay must result in the submersible mixer cutting out.
The electrode relay (K1) must meet the following requirements:
▪
Sensor circuit 10 to 30V ~
▪
Tripping current 0.5 to 3 mA
(equivalent to a tripping resistance of 3 to 60 k
Ω)
5.4.1.7
Leakage at the mechanical seal (optional)
K 1
9
PE
B2
B4
a)
b)
B4
B2
Fig. 5: a) Wiring of the electrode relay and b) Position of the leakage sensor
Mixers with (optional) monitoring of mechanical seal leakage are fitted with an
electrode in the oil chamber in addition to the electrode (B2) monitoring leakage
inside the motor. Both electrodes are connected in parallel and must be monitored
by a single electrode relay.
The electrode relay (K1) must meet the following requirements:
▪
Sensor circuit 10 to 30V ~
5 Installation at Site
20 of 54
Amamix
