Oriental motor DSCD90EC - Multi-Motor Control Setup

Operation
−22−
6.9 Adjusting the rotation speed of two or more motors by a single setting
device (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.27 for parameter.

Adjusting the rotation speed using a variable resistor
Connect the speed controllers as shown below.
When performing multi-motor control using the variable resister, the number of speed controllers should not exceed
20units.
3 1
2
Variable resister
VRx
Control line
Speed controller 1 Speed controller n
VM
VL
L
N
VH
CN1
CN4
VM
VL
L
N
VH
CN1
CN4
AC power line
Speed controller
Resistance (VRx) when the number of speed controllers connected is n:
Resistance VRx (k

) = 20 k

/n, permissible dissipation (W) = n/4
Example: When two speed controllers are connected
Resistance VRx (k

) = 20 k

/2 = 10, permissible dissipation (W) = 2/4 = 1/2

Adjusting the rotation speed using external DC voltage
Connect the speed controllers as shown below.
The number of units connected may limit depending on the current capacity of the external DC power supply.
0 to 5 VDC
or
0 to 10 VDC
DC power supply
Control line
Speed controller 1 Speed controller n
VM
VL
L
N
CN1
CN4
VM
VL
L
N
CN1
CN4
AC power line
Speed controller
Current capacity of external DC power supply when the number of speed controllers connected is n:
Current capacity (mA) = 1 mA ×n
Example: When two speed controllers are connected
Current capacity (mA) = 1 mA ×2 = 2

Adjusting the speed dierence
To adjust the speed dierence among the rst motor and the second and subsequent motors, change the "external
speed command oset" parameter of the speed controller. Refer to p.27 for parameter.
The speed dierence can be adjusted by changing the "setting voltage - rotation speed characteristics" shown in the
gure.
0
Rotation
speed
Range of external speed
command oset
(−800 to +800 r/min)
Setting voltage
Positive
side
Negative
side
<Example>

When the speed of the second motor is slower than that of the
rst motor, set the value for the positive side (0 to +800 r/min) in
the "external speed command oset" parameter of the second
speed controller.