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ΓΕΝΙΚΕΣ ΠΛΗΡΟΦΟΡΙΕΣ

Voltage and frequency


The low voltage motors in this catalogue are delivered for a standard voltage of 230, 400 or 690V according to DIN IEC 38 or for a rated voltage on 50Hz systems.
The motors can run with the variations envisaged in normal operational areas at a voltage of ±5% and frequency of ±2%.
Furthermore, the motors can be used in the operational area with restrictions (variation in voltage of ±10% and frequency of ±3%) as long as the indications given by norm 60034-1 are complied with.


Increased voltage & frequency (60Hz systems)


If the motors are supplied with increased voltage in proportion to the rated frequency (e.g. 480V/60Hz instead of 400V/50Hz), then :
The rated power and speed are increased by 20%
The rated torque decreases by 20%
All other values remain unchanged


Of course, 480V is not a common voltage. In most cases, 60Hz systems works with a voltage of 440V. Hence, not all motors can accommodate a power increase of 20%. For an estimate, it should be assumed that the power increase is only 15%.


Output


The rated outputs and operating characteristics given in the performance data refer according to IEC 60034-1 to:

 

  • Continuous duty S1
  • Frequency of 50Hz
  • Rated voltage
  • Maximum ambient temperature of 40oC
  • Maximum height of installation of 1000m above sea level

 

Motors can also be operated in ambient temperatures above 40oC (up to 60oC) or at altitudes higher than 1000m but in these cases, derating has to be calculated. [Please consult our engineering department for such cases].

 

Efficiency and power factor at partial load


The efficiency and power factor values shown in the performance data refer to rated output at 50Hz.
Values at partial load are given below for reference only:

 

Efficiency in % at
1/2 3/4 4/4 5/4
Of the full load
94 95 96 95
93 94 95 94
92 93 94 93
91 92 93 92
91 92 92 91
89 91 91 90
88 90 90 88
87 89 89 87
86 88 88 86
85 87 87 84
85 86 86 84
84 86 85 83
83 85 84 82
82 84 83 81
80 82 82 80
79 81 81 79
78 80 80 78
77 79 79 77
75 78 78 76
74 77 77 75
73 76 76 74
72 75 75 73
71 74 74 72
70 73 73 71
68 72 72 70
67 71 71 69
66 70 68 68
65 69 67 67
64 67 66 66
62 66 65 65
61 65 64 64
60 64 63 63
59 63 62 62
    
Power factor at
1/2 3/4 4/4 5/4
Of the full load
0.85 0.91 0.93 0.93
0.84 0.9 0.92 0.92
0.81 0.88 0.91 0.91
0.8 0.87 0.9 0.91
0.77 0.86 0.89 0.9
0.75 0.84 0.88 0.89
0.73 0.83 0.87 0.88
0.71 0.81 0.86 0.88
0.69 0.8 0.85 0.87
0.68 0.79 0.84 0.87
0.67 0.78 0.83 0.86
0.65 0.77 0.82 0.85
0.64 0.75 0.81 0.85
0.62 0.74 0.8 0.84
0.61 0.72 0.79 0.83
0.6 0.71 0.78 0.82
0.58 0.7 0.77 0.81
0.57 0.69 0.76 0.8
0.55 0.67 0.75 0.79
0.54 0.66 0.74 0.79
0.53 0.65 0.73 0.78
0.52 0.63 0.72 0.77
0.5 0.62 0.71 0.76
0.49 0.61 0.7 0.75
0.48 0.59 0.69 0.74
0.47 0.58 0.68 0.74
0.46 0.57 0.67 0.73
0.45 0.56 0.66 0.72
0.44 0.55 0.65 0.71
0.43 0.54 0.64 0.7
0.42 0.53 0.63 0.69
0.41 0.52 0.62 0.68
0.4 0.51 0.61 0.67
 

 

Space heater


Upon request all motors, can be equipped with a space heater to protect the inside of the motor against condensed water. Usually rated voltage of this heater is 230V, but on request any low voltage is possible (e.g. 110V). Space heater must be turned on when the motor is stoped and must be switched off during motor operation. Alternatively, it is possible to heat the stator by applying a low single phase voltage to terminals U1 and V1. (5-10% of the rated motor voltage).

 

Frame size Heater power [W]
56 10
63 12
71 15
80 20
90 25
100 30
112 40
132 50
160 120
180 180
200 200
225 200
250 220
280 250
315 280
355 300
400 350

 


Protection devices


In order to protect a motor winding against thermal overloads one of the following devices can be provided:
 

Bimetallic type device:
It consists of 3 motor protectors connected in series. The contact is normally closed; the disc opens when the windings temperature reaches limits dangerous for the insulation system.
On request, normally open device are available.
 

PTC temperature sensor (thermistors) [standard for K-series]
3 sensors connected in series embedded in stator windings. (1 sensor/phase).
Once reached the operating temperature, this device quickly changes the resistance. It is connected to a suitable relay device (not part of our scope of supply).
 

PT100 thermometric resistors
The resistance value of this device varies according to the windings temperature.
It is suitable for continuous monitoring of the windings temperature. For motors up to frame 355 usually 3xPT100s are used (1 per phase).
For larger motors, 6xPT100s are used. (1set of 3 in the DE winding side a set of 3 in the NDE winding side).
 

PT100s, are also very common for the temperature monitoring of the motor bearings.
Upon request, we can install PT100 for both bearings of a motor.
 

All above devices have their separate terminal block in the main terminal box of the motor. Upon request, it is possible to have separate terminal box.

ATHENS, GREECE: 18, Gr. Lambraki Str., 141 23 Likovrisi. Tel: +302102817217. Fax: +302102814277. valiadis@valiadis.gr