Technical data

7
86
Manual – Gear Units and Gearmotors
Standards and regulations (→ GM)
Project Planning for AC Motors
Tolerances According to IEC 60034 (EN 60034), the following tolerances are permitted for electric
motors (also applies to the rated voltage range):
Tolerance A,
tolerance B
Tolerances A and B describe the permitted range within which the frequency and
voltage are allowed to deviate from their respective rated points. The origin identified
with "0" indicates the respective rated points for frequency and voltage.
In the tolerance range A, the motor must be able to deliver the rated torque in continuous
duty (S1). The other characteristic values and the increase in temperature may deviate
slightly from the values for rated voltage and rated frequency.
In the tolerance range B, the motor must be able to deliver the rated torque but not in
continuous duty. The increase in temperature and deviations from the rated data are
higher than in tolerance range A. Avoid frequent operation of the motor at the limits of
tolerance range B.
Undervoltage It is not possible to achieve the values in the catalog such as power, torque and speed
in the event of undervoltage due to weak supply systems or an insufficiently large motor
cable. This is applies in particular to the starting up phase of the motor during which the
starting current amounts to a multiple of the rated current.
Voltage and frequency Tolerance A or tolerance B
Efficiency η P
N
≤ 67 HP
P
N
> 67 HP
-0.15 • (1-η)
-0.1 • (1-η)
Power factor cosϕ
Slip P
N
< 1.3 HP
P
N
≥ 1.3 HP
±30%
±20%
Starting current +20%
Tightening torque -15%...+25%
Breakdown torque -10%
Mass moment of inertia ±10%
-
1 - cos
6
ϕ
59771AXX
Figure 38: Tolerance ranges A and B
Δf [%]
ΔV [%]
-5 -2
+10
+5
+3
-5
-3
+3+2
-7
0
-10
B
A