Thermal Switches; Start-Up; General Start-Up Procedure - Grundfos SEG Instrucciones De Instalación Y Operación

8.4 Thermal switches

All SEG pumps have two sets of thermal switches
incorporated in the stator windings.
Thermal switch, circuit 1 (T1-T3), breaks the circuit
at a winding temperature of approx. 150 °C. In
single-phase pumps, 1.5 kW, the thermal switch will
break the circuit at a winding temperature of approx.
125 °C.
This thermal switch must be connected for
Note
all pumps.
Thermal switch, circuit 2 (T1-T2), breaks the circuit
at a winding temperature of approx. 170 °C (three-
phase pumps) or 160 °C (single-phase pumps).
Warning
After thermal cutout, explosion-proof
pumps must be restarted manually.
FM
The thermal switch (circuit 2) must be
connected for manual restarting of these
pumps.
The maximum operating current of the thermal
switches is 0.5 A at 500 VAC and cos φ 0.6. The
switches must be able to break a coil in the supply
circuit.
In the case of standard pumps, both thermal
switches can (when closing the circuit after cooling)
generate automatic restarting of the pump via the
controller.
Warning
The separate motor-protective circuit
FM
breaker/control box must not be installed
in potentially explosive environments.

9. Start-up

Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
Make sure that all protective equipment
has been connected correctly.
The pump must not run dry.
Warning
The pump must not be started if the
FM
atmosphere in the pit is potentially
explosive.
Warning
It may lead to personal injuries or death to
open the clamp while the pump is
operating.

9.1 General start-up procedure

1. Remove the fuses, and check whether the
impeller can rotate freely. Turn the grinder head
by hand.
2. Check the condition of the oil in the oil chamber.
See also section
10.2 Oil
3. Check whether the monitoring units, if used, are
operating satisfactorily.
4. Check the setting of the air bells, float switches
or electrodes.
5. Open the isolating valves, if fitted.
Auto-coupling: It is important to grease the
gasket of the guide claw before lowering the
pump into the pit.
6. Lower the pump into the liquid and insert the
fuses.
Auto-coupling: Check that the pump is in right
position on the auto-coupling base unit.
7. Check whether the system has been filled with
liquid and vented. The pump is self-venting.
8. Switch on the power supply to the pump. When
power is on, the pump will start and pump down
to the dry-running level. This process can be
used to check that the pump functions correctly.
In case of abnormal noise or vibrations
from the pump, other pump failure or
power supply failure, stop the pump
Caution
immediately. Do not attempt to restart the
pump until the cause of the fault has been
found and the fault corrected.
After one week of operation after replacement of the
shaft seal, the condition of the oil in the chamber
should be checked. See section
and service.
change.
10. Maintenance
15