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7. Insulation check and bearing replacement
When first putting into operation and especially after
longer storage, test the insulation resistance of the coil
against chassis ground and between the phases. Do
not apply more than 500 V. During and directly after the
measurement, there will be dangerous voltages at the
terminals. Do not touch the terminals under any circum-
stances; follow the operating manual of the insulation
tester exactly! Based on the nominal voltage U
N
and a
coil temperature of 25°C, the following minimum values
must be achieved:
If the values are below the minimum values, the coil
needs to be dried properly until the insulation resistance
corresponds to the required value. After a storage time
of four years, the bearings must be replaced with new
ones of the same type.
8. Putting the motor into operation
Make absolutely sure to observe all safety instructions.
Work on the motor only if it has been de-energised.
The installation must be carried out by properly trained
personnel in compliance with the applicable regula-
tions. First, compare the mains power properties
(voltage and frequency) to the specifications on
the rating plate of the motor. The dimensions of the
connecting cables must be adequate for the nominal
currents of the motor.
The designation of the connection points of the motor
corresponds to DIN EN 60034 part 8. Item 16 in this
manual shows the most common circuit diagrams used
for the connection of single-phase motors in their basic
configuration. For other configurations, special circuit
diagrams are supplied which are either affixed to the
terminal box lid or otherwise included. For the connec-
tion of auxiliary and safety devices (e.g. separate fans)
an additional terminal box can be provided, which is
subject to the same regulations as the main terminal
box.
The motors must operate with overcurrent protection
adjusted to 1.05 times the nominal motor specifications.
Otherwise, no warranty claims can be made for coil
damage. Before switching on the motor for the first time,
it is advisable to check the insulation resistance be-
tween coil and chassis ground and between the phases
(see section 7). After prolonged storage, this insulation
test is absolutely required. Before coupling the work
machine to the motor, check the rotational direction of
the motor to prevent damage to the drive motor. The
table below specifies the permissible fastening torque
for the terminal board bolts:
Before closing the terminal box, it is absolutely
necessary to check that:
– The connection has been made in accordance with
the connection diagram.
– All terminal box connections have been tightened
securely.
– All minimum clearance values have been kept (at
least 8 mm up to 500 V, at least 14 mm up to 1 000 V).
– The interior of the terminal box is clean and free from
foreign objects.
– Unused cable entry points have been sealed and the
screw plugs with gaskets have been tightly fastened.
– The gasket in the terminal box lid is clean and all seal-
ing surfaces are in proper condition in compliance with
the IP code.
Before switching on the motor, check to ensure that
all safety regulations have been adhered to, that the
machine has been properly installed and aligned, that
all fastening parts and earth connections are tightly fas-
tened, that the additional devices and accessories are
functional and properly connected, and that the feather
key of any second shaft extension is protected against
being ejected.
Switch on the motor without load, if possible. If it runs
quietly and without abnormal noise, add the load of the
driven machine. When putting the motor into operation,
it is advisable to monitor the electric current input when
the motor is loaded with the driven machine to ensure
that any overload is recognised early. Observe the
safety instruction both during the operation of the motor
and when switching it off.
9. Maintenance
Observe all safety instructions, in particular regarding
disconnection, securing isolation, and proving dead of
all parts connected to a power source.
When disconnecting the motor from the mains for
maintenance work, make sure to also disconnect any
auxiliary electric circuits, e.g. standstill heaters, sepa-
rate fans, brakes, etc.
If the motor needs to be dismantled for maintenance,
the sealant at the centring flanges needs to be re-
moved; during re-assembly, a suitable motor sealant
must be re-applied. Any copper sealing washers must
always be re-installed.
Terminal board
16 A
Connecting bolt thread
M4
Permissible fastening torque in Nm
1.2 + 0.5
Nominal power P
N
[kW]
0.06 < P
N
< 2.2
Insulation resistance relative to nominal
voltage kΩ/V
6.3
