RS V10752 Hoja De Instrucciones página 6

Example 1
Using servo motor with tachogenerator (RS stock no. 263-6005) for
velocity control using tachometer feedback with the following
characteristics:
Peak Current = 3A
RIPeak = (4700 * 3) / 4.2 - 3) = 11750Ω
use 12KΩ
Nominal current = 1A
Nominal to peak current ratio = 1A/3A = 1/3
2
RIRatio = 15000/[1/3) -0.125] = -1080000Ω
do not fit RIRatio
Maximum speed = 2000rpm
Tacho voltage constant = 3.25 V/1000rpm
V/1000rpm
RTach = (400 * 2 * 3.25) -2000 = 600Ω
use 680Ω
Enable and directional limits are not being used and are not connected
so set SW1-1 and SW1-2 to OFF.
Enhanced speed scaling should not be required so set SW1-3 to OFF.
Velocity control so set SW1-4 to ON.
Example 2
A motor for velocity control using armature voltage feedback with the
following characteristics:
Peak Current = 14.8A
RIPeak = (4700* 14.8) / (4.2 - 14.8) = -6562Ω
do fit RIPeak
Nominal current = 2.8A (To avoid overheating, do not use
1000% duty cycle at this current).
nominal to peak current ratio = 2.8A/4.2A
RIRatio = 15000/[2.8/4.2)2 -0.125] = 46956Ω
use 47KΩ
Armature voltage feedback so fit link for LKArm
Maximum speed = 3000rpm
Motor voltage constant = 7.4 V/1000rpm
Ke = 7.4 V/1000rpm
RArm = 260 * 3 * 7.4 = 5772Ω
use 5K6Ω
Enable input is not being used and is not connected so set SW1-1 to
OFF
Directional end of travel limits are connected via normally closed
switches to +24V so set SW1-2 to ON.
Enhanced speed scaling should not be required so set SW1-3 to OFF.
Velocity control so set SW1-4 to ON.
Vm = 2 rpm/1000
KE = 3.25
Peak current limit = 4.2A
Vm = 3rpm/1000
V10752
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