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BG90S/L: Double drillholes are provided for Type IM B3 in the rear feet
(see Fig. 10) to maintain the standard foot dimensions.
2.3
Terminal box
BG56...90L: In the case of 1LA, 1LP and 1LP motors, the top part
of the terminal box can be turned through 4x90 degrees.
BG100...160L: The cast terminal box on the motor housing cannot be
turned. In the case of motors with screw-fitted top section on
the terminal box this can be turned 4 times through 90 degrees (Fig.
2 - 5.90).
2.4
Balancing, transmission elements
A suitable device should always be used for fitting and removing the
transmission elements (couplings, pulleys, pinions, etc.) (Fig. 7).
As standard, the rotors are dynamically balanced with the
half featherkey.
When fitting the transmission element, keep the type of
balance in mind! (Option: F = balanced with full featherkey)
The transmission elements must be balanced in accordance
with ISO 1940!
If the transmission elements are balanced with a half
featherkey, the visible, protruding part of the featherkey T
must be cut back (see Fig. 9).
The usual measures should be taken to guard
transmission elements from touch. If a motor is started
up without the transmission element attached, the
featherkey should be secured to prevent it being
thrown out.
2.5
Electrical connection
NOTE: If the openings for cables and leads in the terminal box
are sealed with a "skin" of cast iron, it must be shaken out using a
suitable tool (see Fig. 4)!
Care must be taken not to damage the terminal box, the
terminal board, the cable connections, etc. inside the terminal
box!
See Fig. 4 for details of the screwed connections for cables and leads.
An adapter must be screwed in for PTC thermistor
connections!
The terminal box must be sealed so that it is dust and water-tight.
The system voltage and the frequency must agree with the data given
on the rating plate. Voltage or frequency deviations of ±5% and ±2%
respectively from the rated voltage and frequency values are permitted
without needing to derate the output. The connection and arrangement
of the terminal links must agree with the diagram provided in the
terminal box.
Connect the earthing conductor to the terminal with the
Wherever terminal clips are used (for example, to DIN 46282),
arrange the conductors so that the clips are virtually level on
both sides. This method of connection means that the ends
of single conductors must be bent in the shape of a U or be
fitted with a cable lug (see Fig. 6.1). This also applies to the
green-yellow protective earthing conductor and the outer
earthing conductor (see Fig. 6.2).
Please refer to Fig. 5 for the tightening torques for the screwed
electrical connections - terminal board connections (except for
terminal strips).
The anti-condensation heater must not be switched on
during operation.
2.6
Checking the insulation resistance
The insulation resistance of the windings must be measured prior to
initial startup of the motor, or after long periods of storage or standstill
(approx. 6 months).
While the measurement is being taken and immediately
afterwards, some of the terminals carry dangerous voltages
and must not be touched.
Insulation resistance
- The minimum insulation resistance of new, cleaned or repaired
windings with respect to ground is 10 Mohms.
- The critical insulation resistance R
multiplying the rated voltage U N , e.g. 0.69 kV AC, with the constant
factor (0.5 Mohms/kV):
R crit = 0.69 kV * 0.5 Mohms/kV = 0.345 Mohms.
Siemens AG
ENGLISH
Measurement
The minimum insulation resistance of the windings to ground is
measured with 500 V DC. The winding temperature should then be
25 o C ± 15 o C.
The critical insulation resistance should be measured with 500
V DC with the winding at operating temperature.
Checking
If, the minimum insulation resistance of the winding against earth is
less than 10 Mega Ohm in the case of a new or cleaned winding or repaired
motor which has been stored or has been standing still for a longer period,
moisture can be the cause.. The windings must then be dried.
After long periods of operation, the minimum insulation resistance
may drop to the critical insulation resistance. As long as the
measured value does not fall below the calculated value of the critical
insulation resistance, the motor may continue in operation. If it
does, the motor must be stopped immediately.
The cause must be determined, and the windings or winding sections
repaired, cleaned or dried as necessary.
2.7
NOTE: Electromagnetic compatibility
P
thus excessive emitted interference.
In the case of converter-fed motors, interference is emitted to a
greater or lesser degree, depending on the converter version concerned
(type, interference suppression measures, manufacturer). The
instructions of the converter manufacturer regarding electromagnetic
compatibility must be heeded at all times. If a sheathed motor supply
cable is recommended then the sheathing will be best effective when
a conductive connection is made to the large surface on the metal
terminal box of the motor (metal union). Noise voltages may occur on
the sensor leads of motors with integrated sensors (e.g. PTC
thermistors) as a result of the converter.
Noise immunity: If the motor has an integrated sensor (e.g. a
PTC thermistor), the owner is responsible for ensuring adequate
noise immunity by choosing a suitable sensor signal lead (possibly
with shielding, connected like the motor supply lead) and evaluator.
The data and recommendations specified in all the instructions
supplied ("Information on safety and commissioning"), and in
all other related instructions, must always be observed prior to
commissioning!
After motor installation, the brake, if fitted, should be checked
for proper functioning.
marking.
3
NOTE: Where motors are fitted with closed condensed water openings,
these should be opened from time to time to allow any accumulated
condensed water to drain away.
Condensed water openings should always be at the lowest point of
the motor!
is calculated first by
crit
Commissioning
Emitted interference: Where the torque is very uneven
(the drive of a piston-type compressor, for example), the
inevitable result is a non-sinusoidal motor current, whose
harmonics can lead to excessive system perturbation and
Maintenance
Safety precautions
Before starting any work on the motor or other
equipment, particularly before opening covers over
live parts, the motor must be properly isolated
from the power supply. Besides the main circuits, any
additional or auxiliary circuits that may be present must
also be isolated.
The usual "5 safety rules" (as set forth in DIN VDE 0105)
are:
- Isolate the equipment
- Take effective measures to prevent reconnection
- Verify equipment is dead
- Earth and short-circuit
- Cover or fence off adjacent live parts
The precautions listed above should remain in force
until all maintenance work is finished and the motor has
been fully assembled.
5
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