Parker Hannifin G2 manual Restrictions on the motor, 11-13, Motor current No. of motor revolutions

11.4Restrictive 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)

		NR		1					ηB
ηB	=		(t1+2t2+t3) ⋅				⋅ 100	Equation (1)	B = Velocity duty
		2				5tCY
					1				η = Current duty
C	2		2 2						I1, I2, I3 = Current (A)
η	= (t1I1+t2I2+t3I3)			⋅ 5tCY ⋅ 100				Equation (2)	NR = No. of revolutions (rps)
ηB + 2.6 ⋅ ηC < 103						Equation (3)			tCY = Cycle time (msec)
									t1, t2, t3 = Time (msec)

Motor current

No. of motor revolutions

(Figure 11.1)	(Figure 11.2)	Average velocity/current duty
		simplified graph

No. of revolutions

Current duty ηC (%)

11

11-13