KSB Amarex N, Operating Manual

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5 Installation at Site
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Amarex N
Explosion-proof pump sets (version YL)
Explosion-proof pump sets are equipped with double monitoring of the winding
temperature. Two 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.
Opening of the switch contacts must result in the pump set cutting out. Automatic
re-start is permissible.
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.
Opening of the switch contacts 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
5.4.2 Electrical connection
DANGER
Work on the pump set by unqualified personnel
Danger of death from electric shock!
▷ Always have the electrical connections installed by a trained and qualified
electrician.
▷ Observe regulations IEC 60364 and, for explosion-proof models, EN 60079.