Electrical Connection; Installation And Operating Instructions - Grundfos LiqTec Montage- Und Betriebsanleitung

English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
1. Description
2. Mounting the LiqTec sensor

3. Electrical connection

4. Calibration of sensor and LiqTec
5. Functions
6. Calibration of sensor and LiqTec
7. Further information
8. Disposal
1. Description
LiqTec
• protects the pump against dry-running.
• protects the pump against too high liquid
temperature (130 °C ± 5 °C).
• can monitor the motor temperature if the PTC
sensor in the motor has been connected.
• has a fail-safe design. If the sensor, sensor
cable, electronic unit or power supply fails, the
pump stops immediately.
2. Mounting the LiqTec sensor
LiqTec can be fitted to a DIN rail to be incorporated
in a control cabinet.
See illustrations on page 60.
3. Electrical connection
Example of electrical connection, see page 61.
4. Calibration of sensor and LiqTec
Follow the procedure on the next page.
5. Functions
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1. Connection for dry-running sensor
Service number of dry-running sensor:
96556427.
2. Connection for external restarting.
3. Motor PTC
Green light indicates OK or short-circuited
terminals.
Red light indicates too high motor temperature.
The alarm relay is activated
4. Connection for PTC sensor
A PTC sensor according to DIN 44082 can be
connected to this terminal.
If the PTC sensor is not used, the terminals must
be short-circuited.
5. Sensor indicator light
Red light indicates defective sensor or cable.
The alarm relay is activated.
6. Deactivation of the dry-running monitoring
function
Press the button to deactivate the dry-running
monitoring function. Red flashing light.
The PTC monitoring function is still active.
Press the Restart button to reactivate the dry-
running monitoring function.
7. High liquid temperature indicator light
Red light indicates too high liquid temperature
(130 °C ± 5 °C).
The alarm relay is activated.
8. Supply voltage
200-240 V, 50/60 Hz.
9. Dry-running indicator light
Green light indicates OK (liquid in pump).
Red light indicates dry running (no liquid in
pump). The alarm relay is activated.
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