Adjusting The Rotation Speed Of Two Or More Motors By A Single Speed Setter (Multi-Motor Control) - Oriental motor DSC Series Operating Manual

Operation
6.9 Adjusting the rotation speed of two or more motors by a single
speed setter (multi-motor control)
Two or more motors can be operated at the same speed using a single variable resistor or external DC voltage.
Set the "external speed command input" parameter to "ON (Enable)," and turn the M0 input and M1 input OFF.
Refer to p.29 for parameters.
„ Adjusting the rotation speed using a variable resistor
Connect the speed controller as shown below.
When performing multi-motor control using the variable resister, the number of speed controllers should not exceed
20 units.
2
3
Variable resister
VRx
Speed controller
AC power line
Resistance (VRx) when the number of speed controllers is n:
Resistance (VRx) = 20/n (kΩ), permissible dissipation = n/4 (W)
Example: If two speed controllers are used
Resistance = 20/2 = 10 (kΩ), permissible dissipation = 2/4 = 1/2 (W)
„ Adjusting the rotation speed using external DC voltage
Connect the speed controller as shown below.
The number of connected units may limit depending on the current capacity of the external DC power supply.
DC power supply
0 to 5 VDC
or
0 to 10 VDC
Speed controller
AC power line
Current capacity (I) of external DC power supply when the number of speed controllers is n:
Current capacity (I) = 1 × n (mA)
Example: If two speed controllers are used
Current capacity (I) = 1 × 2 = 2 (mA)
„ Adjusting the speed difference
To adjust the speed difference among the first motor and the second and subsequent motors, change the "external
speed command offset" parameter of the speed controller. Refer to p.29 for parameters.
The speed difference can be adjusted by changing the "setting voltage - rotation speed characteristics" shown in the
figure.
Rotation
speed
Positive
side
0
−24−
1
Speed controller 1
CN4
CN1
VH
L VM
N VL
Speed controller 1
CN1 CN4
L VM
N VL
Range of external speed
command offset
(−800 to +800 r/min)
Negative
side
Setting voltage
Control line
Speed controller n
CN4
CN1
VH
L VM
N VL
Control line
Speed controller n
CN1 CN4
L VM
N VL
<Example>
• When the speed of the second motor is slower
than that of the first motor, set the value for the
positive side (0 to +800 r/min) in the "external
speed command offset" parameter of the
second speed controller.