Lenze ECSCMxxx - Manual (Page 36)

Technical data
Current characteristics
Increased continuous current depending on the control factor
3
l
36 EDBCSXM064 EN 11.0
Example:
The ECS axis module suitable for operation in conjunction with a Lenze motor of type
MCS 14L32 is to be determined.
ƒ Rated motor data
– Rated motor torque (M
mot
) = 17.2 Nm
– Rated motor speed (n
mot
) = 3225 rpm
– Motor voltage at 3250 rpm (U
mot_n3250
) = 275 V
– Rated motor current (I
mot
) = 15 A
– Max. motor current (I
mot_max
) = 92 A
ƒ Application data:
– Max. torque (M
max
) = 35 Nm
– Max. operating speed (n
max
) = 2500 rpm
– An effective process power (P
eff
) of 4.5 kW arises on the basis of the Mn diagram.
– The drive rating results in an effective motor current (I
Mot_eff
) of 14.8 A.
A first estimation based on the rated current of the ECS axis module would probably lead
to selecting the ECSxM048 module with a rated current of 17.0 A.
However, if we take into account the increased continuous current for smaller control
factors, the more cost−effective ECSxM032 axis module with a rated current of 12.7 A can
be used here.
ƒ When the MCS 14L32 is operated with 2500 rpm, the real motor voltage is
(U
Mot_n2500
):
U
Mot_n2500
+ U
Mot_n3250
@
n
max
n
Mot
Þ 275 V
@
2500 rpm
3250 rpm +
212 V
ƒ This leads to the following max. control factor (
α
max
) of the axis module:
a
max
+
U
Mot_n2500
U
max
Þ
212 V
360 V
+ 0.59 + 59 %
Using the current characteristic of Fig. 3−1 (
^ 34), a continuous current of 15.5 A can
be determined for the ECSxM032 axis module when the control factor ( α
max
) is 59 %.
ƒ Result:
Under the conditions mentioned above the MCS 14L32 Lenze motor can be operated
continuously on the ECSxM032 axis module.