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11-13
11.4 Restrictive Conditions for the Frequency of Repeated
Operations (DR5000B Series Only)
When running and stop operations are performed repeatedly on DYNASERV DR5000B series (DR5030B,
5050B, 5070B) because of a high number of rated revolution, some restrictions may apply based on the
characteristic of the motor and the driver with respect to the frequency of repeated running and stop operations.
Consider those restrictions carefully when using the motor.
(1) Restrictions on the motor
The operating conditions under which the motor rotates and stops repeatedly are set assuming that the motor is
mounted on a metal stand, and the ambient temperature is 45°C.
When the motor is operated repeatedly with a cycle of acceleration, uniform speed, deceleration and stop, if the
load conditions and the operation time are set as shown in Figure 11.1, it is necessary to satisfy the equations
below.
In addition, if either the average speed (number of revolutions) or the current duty is known, the other can simply
be obtained from the graph shown in Figure 11.2.
The motor, current and speed can actually be measured by the oscilloscope function (see Chapter 8) of the PC
utility. Verify them with the monitor numbers listed below.
#365 Present velocity value
#369 Present current value (A/D)
N
R
1
η
B
=
2
(t
1
+2t
2
+t
3
) ×
5t
CY
× 100 Equation (1)
1
η
C
= (t
1
I
2
+t
2
I
2
+t
3
I
2
) ×
5t
CY
× 100 Equation (2)
η
B
+ 2.6 ⋅ η
C
< 103 Equation (3)
η
B
= Velocity duty
η
B
= Current duty
I1
, I
2
, I
3
= Current (A)
NR
= No. of revolutions (rps)
tCY
= Cycle time (msec)
t1
, t
2
, t
3
= Time (msec)
(Figure 11.2)
Average velocity/current duty
simplified graph
No. of revolutions
Current duty
η
C
(%)
Motor current
No. of motor
revolutions
(Figure 11.1)
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