Standards and specifications

The motors comply with the appropriate standards and regulations, especially those listed in the table below.

Testing, quality assurance, acceptance inspection

Type testing is carried out for new machines. In series production, each motor is subjected to a routine test.

As part of quality assurance measures, the motors are subjected to in?process inspections.

Type test or routine test certificates can be issued upon request (must be specified in the order).

Inspection of motors by a customer or a customer's agent incurs additional expense because each motor will already have undergone standard testing. The inspection criteria must be specified in the order (fully clarified) as this is then used as a basis for calculating the overhead and billable costs.

Types of construction according to EN 60034?7/IEC 60034?7

Hoisting gear motors are primarily used in types of construction IM B3, IM B5, IM V1, and IM B35, although they can be supplied in other types of construction (please inquire).

The individual sections provide information about the listed available types of construction of the various motor series.

EN 60034?7 Code I	IM B3	IM B35	IM B5	IM V1	IM V5	IM V6	IM B6	IM B7	IM B8	IM V3
EN 60034?7 Code II	IM 1001	IM 2001	IM 3001	IM 3011	IM 1011	IM 1031	IM 1051	IM 1061	IM 1071	IM 3031

Insulation

The insulation system protects the winding against aggressive gases, vapors, dust, oil and increased air humidity. It can withstand the vibration stresses and ambient conditions that normally occur in hoisting operations.

Temperature classes

In EN 60034?1, the winding insulation (incl. impregnating material) is classified into temperature classes which are assigned specific overtemperatures.

The motor output specifications are uniformly based on a coolant temperature of 40 °C at an installation altitude of 1000 m above sea level for all insulation classes. The various sections provide information about the permissible outputs under other ambient conditions.

Temperature limit in K according to temperature class

Mechanical balance quality

Dynamic balancing

All rotors in hoisting gear motors are dynamically balanced with an inserted half featherkey. This corresponds to vibration severity grade A (normal). EN 60034?14 specifies the factory acceptance vibration test procedures and vibration limits for electrical machines. "Half?key balancing" (half featherkey = code H) is specified here based on ISO 8821.

Full?key balanced machines can also be shipped as special versions (please inquire).

Note for 1LP and 1LG three?phase squirrel?cage motors:

Low?vibration version B can be supplied to fulfill stricter requirements on smooth running. For converter?fed operation with frequencies greater than 60 Hz, special balancing is required for compliance with the specified limit values (plain text: maximum supply frequency/speed).

Vibration severity

The vibration severity is the r.m.s. value of the vibration velocity (frequency range from 10 Hz to 1000 Hz).

A motor balanced in accordance with the relevant standard, however, may vibrate more strongly at the operating site.

This can be caused by the following factors:

• Unsuitable foundation
• Interference from the driven machine
• Components with a natural frequency that is almost identical to the frequency of the residual unbalance of the motor.

In cases such as these, each element in the system – not just the motor itself – needs to be checked.

The table below shows the limit values of electrical machines in accordance with EN 60034?14 Nov. 2004.

The balancing type is stamped on the face of the DE¹⁾ shaft extension:

• F = Balancing with full featherkey
• H = Balancing with half featherkey
• N = Balancing without featherkey

¹⁾ DE is the motor's drive end with shaft. NDE is the motor's non?drive end.

Bearings

All motors are equipped with rolling?contact bearings.

Motors equipped with cylindrical roller bearings are shipped with a rotor shipping brace to prevent brinelling in the DE¹⁾ bearings during transportation and storage.

¹⁾ DE is the motor's drive end with shaft. NDE is the motor's non?drive end.

Shaft extensions

The squirrel?cage motors up to and including shaft height 160 have cylindrical shaft extensions. The motors are always supplied with a featherkey inserted in the shaft.

Coupling

The standard versions of hoisting gear motors are designed for coupling output. Pinion, chain, and belt outputs generate greater cantilever forces and bearing loads, which must be taken into account.

Motor protection

Hoisting gear motors are operated with a higher load factor in intermittent duty. If there is excessive power consumption, an undervoltage in the supply, an excessive ON duration, or excessive coolant temperatures or if the heat is not being dissipated adequately (speed of naturally cooled machines is too low), this can cause the temperature in the windings to rise and the motors to overheat. Direct and indirect measures can be taken to protect the motors from overheating. An adequate monitoring concept should take into account all the relevant factors.

In intermittent duty, devices that offer indirect protection (e.g. circuit?breakers, overload relays, or I^2?t monitors) can only partly detect the causes of overheating.

The most reliable method is to detect excessively high temperatures directly at the point at which they occur (i.e. the machine windings). In this way, the effects of all possible causes can be detected by a single means.

The resistance of the PTC thermistor detectors integrated in the windings increases significantly if the response temperature is exceeded. A tripping unit (Catalog LV1) detects this increase and uses a contact to intervene in the open?loop control. An additional detector loop for emitting a warning signal just below the shutdown temperature can also be used in process?critical production processes to allow working cycles that have already been started to be brought to an end.

It is recommended that KTY 84 temperature sensors be installed in converter?fed drives (the basic version of 1PH8 motors are equipped with these sensors as standard). This sensor is embedded in the winding head of the motor in the same manner as a PTC thermistor. The data is evaluated directly in the converter. Warning and shutdown response limits can be set. Since only one sensor can be evaluated in the converter, this motor protection method is only suitable in single?motor drives; PTC thermistors are recommended for drives with more than one motor (e.g crane traversing gears).