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Danaher Motion
Establishing a Single, or one Break Line Limit
Diode 26 sets the speed at which horsepower contouring will begin (P1).
D26 is calculated as:
V
= 8*N
/ N
– 1.5
Z
s
max
Where:
V
is the Zener Diode Voltage Rating
Z
N
is the speed at which contouring begins
s
N
Is the Maximum System Speed.
max
The first line segment, P1-P2 or P1-P3, has its slope established by R25. If a single-line segment
approximation is suitable, the resistor must have the line segment intersect at P3 and R30 is a 0Ω jumper.
The value of R25 is determined as follows:
R25 = 20,000 * (8-V
12-(8*I
clamp
Where:
V
is the Zener Diode Voltage Rating
z
I
is the Maximum current at the breakpoint
clamp
I
is the Drives Peak Current Rating (2* continuous)
peak
Establishing a Two-Line or Break Limit
If a two-line segment is required, R30 is set to 2KΩ, D26 is calculated as above, and R25 is calculated for
the first line segment (P1-P2) with the following equation:
R25 = 20,000 * ((8*N
12-(8*I
Where the new variables:
N
= Desired Speed for second break
b
N
= Motor's Rated Speed
r
The second line segment (P2-P3) is established using D20A and R31.
POTENTIOMETER ADJUSTMENTS
This section describes the purpose and effects of adjusting each of the drive's 4 adjustment
potentiometers. Two potentiometers (DC Gain and AC Gain) are located on the comp card and face the
user. The other two potentiometers (Balance and Current limit) are located at the top of the drive unit.
DC Gain – Scale
This potentiometer adjusts the velocity scaling of the drive. The analog input to the drive causes a
commanded velocity to the motor. This potentiometer adjusts the amount of input voltage signal required
to command a given motor velocity. This potentiometer is typically adjusted for 10-volts = rated speed for
systems requiring only velocity control. In systems where the drive is used inside a position loop, it is
common to adjust this pot so that 8-volts = rated motor speed to allow servo headroom.
36
)
z
/ I
)
peak
/N
)-V
)
- 2000
b
r
z
/ I
)
clamp
peak
SERVOSTAR
Operation Information
®
SBD-Series ST/CT Product Family
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