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Before installation, check motor specifications from nameplate if they fit the requirements
of the load and specification of voltage and frequency.
Measure the insulation resistance between windings and housing.
Note the following safety information before connecting-up the motor:
Only qualified and trained personnel should carry out work on the motor while it is
stationary.
Disconnect the motor from the power supply and take measures to prevent it being
reconnected. This also applies to auxiliary circuits.
Check that the motor really is in a no-voltage condition.
Establish a safe protective conductor connection before starting any work.
It must be ensured that there are no foreign bodies, dirt, or moisture in the terminal box.
Keep the inside of the terminal box clean and free from trimmed-off ends of wire.
Close any additional open cable entries with O-rings or suitable flat gaskets, the terminal box
itself must be sealed so that it is dust and watertight using the original seal.
When performing a test run, secure the feather keys without output elements.
Earthing must be carried out according to local regulations before the machine is connected
to the supply voltage.
The losses occurring during no-load operation in single phase motors are much more than the losses
in nominal load operation. Therefore, single phase motors must not be run no-load for a long time.
Terminals and Direction of Rotation
The standard motors are suitable for clockwise and counterclockwise rotation.
In three phase motor, when the power cables L1, L2, L3 are connected to U1, V1, W1 respectively,
the three phase motor shaft turns in clockwise direction (looking at the shaft from drive side). If two
of the power cables are interchanged then the resulting direction of rotation is counterclockwise.
In single phase motor, when the power cables L1 and N are connected to U1 and U2 respectively, the
single phase motor shaft turns in clockwise direction (looking at the shaft from drive side). If the
winding ends (Z1 and Z2) of the auxiliary winding are replaced then the resulting direction of rotation
is counterclockwise.
In addition to the main winding terminals and earthing terminal, the terminal box can also contain
connections for thermistors, heating elements or other auxiliary devices.
The terminal box on standard single speed three phase motors normally contains six winding
terminals and at least one earthing terminal. This enables the use of DOL (direct online) or Y/D (star
delta) starting. The standard single-phase motor terminal box contains four winding terminals (two
main winding ends and two auxiliary winding ends), two capacitor terminals (CR) and at least one
ground terminal.
The three phase motors shall be connected in star or delta according to rated voltage given in their
nameplate and the network voltage that they will be connected to. For phase to phase 400 V supply,
the motors with 230/400V nameplate values shall be connected in star (Y) and the motors with
400/690V nameplate values shall be connected in delta (Δ). The connection types given below should
be applied for single-phase motors, depending on the direction of rotation.
Terminal Connection For Single Speed Motor:
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