KSB Amarex N series, Installation And Operating Manual

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5 Installation at Site
34 of 84
Amarex N
2563.84/08-EN
WARNING
Incorrect electrical connection
Electric shock!
▷ Adequately insulate conductor 22.
Conductor 22 has no function on standard pump sets.
However, it can be live and must, therefore, be insulated or connected to a dummy
terminal.
Explosion-proof pump sets (version YL)
Explosion-proof pump sets are equipped with double monitoring of the winding
temperature. 2 bimetal switches (terminals 20 and 21, max. 250 V~/2 A) serve as
temperature control devices which open when the winding temperature is too high.
Tripping must result in the pump set cutting out. Automatic re-starting is permitted.
Two additional bimetal switches (terminals 21 and 22, max. 250 V~/2 A) serve as
temperature limiters which open when the temperature limit is exceeded.
Tripping must result in the pump set cutting out. The pump set must not re-start
automatically.
5.4.1.6 Leakage inside the motor (optional)
PE
K 1
9
81-56
B2
Connecting the electrode relay Position of the electrode in the motor housing
An electrode fitted inside the motor monitors the winding space (B2) for leakage.
The electrode is intended for connection to an electrode relay (core marking 9).
Tripping of the electrode relay must result in the pump set cutting out.
Every time the relay trips the pump set, the pump set needs to be inspected and its
insulation resistance measured.
The electrode relay (K1) must fulfil 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 kΩ)
Example ▪ Telemécanique RM4-LG01