KSB Amarex KRT, Инструкция по установке и эксплуатации

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thermistors with terminals 10 and 11 must be used. They must be connected to a
thermistor tripping unit with manual reset and ATEX approval for monitoring the
temperature of explosion-proof motors in "flameproof enclosure Ex d" type of
protection.
5.4.1.4.2 Leakage inside the motor
PE
K 1
9
Connecting the electrode relay
B2
Position of the electrode in the motor housing
An electrode fitted inside the motor monitors the winding and connection space for
leakage. This electrode must be connected to an electrode relay (core identification
9). 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 30V ~
▪
Tripping current 0.5 to 3 mA
(equivalent to a tripping resistance of 3 to 60 k
Ω)
5.4.1.4.3 Leakage at the mechanical seal (only for pump sets with reinforced
bearings)
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. (
⇨
Section 9.2 Page 70)
5.4.1.4.4 Bearing temperature
As an option, the pump set can be supplied with temperature monitoring in the area
of the lower bearing.
Check in the data sheet whether the pump set is equipped with bearing temperature
monitoring.
The bearing temperature 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 6V/2mA).
Set the following limits:
▪
Alarm at 110 °C
▪
Cut-out of the pump set at 130°C
Fig. 17: Float switch
5 Installation at Site
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