Starting Up The Product - Grundfos SLC Series Installation And Operating Instructions Manual

5. Starting up the product

WARNING
Arc flash and electric shock hazard
Death or serious personal injury
- Wear appropriate personal protective equipment
(PPE) and tools while working on this equipment.
CAUTION
Toxic material
Minor or moderate personal injury
- Before starting any work on pumps used to pump
liquid which could be constituted as being
hazardous to health, a thorough cleaning and
venting of pumps, pits, etc. must be carried out
according to local regulations.
DANGER
Electric shock
Death or serious personal injury
- Startup must be carried out by authorized
personnel in accordance with local regulations.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, pumps,
pits, etc., make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
Proceed as follows:
1. Check that the float switches have been connected according
to the wiring diagram for the application.
2. Check that the pump inlet is submerged in the liquid to be
pumped.
3. Observe the warning below. Set the overload relay to the
rated current stamped on the pump motor nameplate.
DANGER
Electric shock
Death or serious personal injury
- Set the overload relay to the rated current
stamped on the pump motor nameplate.
12
4. Switch on the power supply.
Three-phase pumps only: Check for wrong phase sequence.
If the phase sequence is wrong, the impeller will rotate
backwards.
5. Check the direction of rotation before starting up the pump. An
arrow on the stator housing of most Grundfos pumps indicates
the correct direction of rotation. For a Grundfos pump, check
that the direction of rotation is clockwise when viewed from
above. See fig. 9. Check the Installation and Operating
Instructions for the pump to verify the correct direction of
rotation.
Fig. 9 The correct direction of rotation is clockwise for most
Grundfos pumps
For Grundfos pumps:
Check the direction of rotation when connecting the pump to a
new installation. The direction of rotation can be checked in the
following way:
• Let the pump hang from a lifting device, e.g. the hoist used for
lowering the pump into the tank.
• Start and stop the pump while observing the movement (jerk)
of the pump. If connected correctly, the pump will rotate
clockwise, i.e. it will jerk counter-clockwise.
• If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable.
• Check that a stop float switch is installed to ensure that the
pump does not dry run. If the pump is dry running, increase
the height of the stop float switch.
• Three-phase pumps: Check that the direction of rotation of
the pump is correct according to the installation and operating
instructions for the pump in question.
• Select the required operating mode by means of the
automatic/manual/off toggle switch.