Elmo SSA Series - Servo Control Operation; Input Signal Configurations and Gain

9
SSA - Rev 6/98
4
4
4
.
.
.
O
O
O
p
p
p
e
e
e
r
r
r
a
a
a
t
t
t
i
i
i
o
o
o
n
n
n
o
o
o
f
f
f
t
t
t
h
h
h
e
e
e
s
s
s
e
e
e
r
r
r
v
v
v
o
o
o
c
c
c
o
o
o
n
n
n
t
t
t
r
r
r
o
o
o
l
l
l
4
4
4
.
.
.
1
1
1
I
I
I
n
n
n
p
p
p
u
u
u
t
t
t
s
s
s
The SSA has 2 inputs: A single ended input (no.1) at terminal 1 and a
differential input (no.2) at terminals 3,4.
The current gain of input 1 (current mode) is given by:
66 x Ic
Gc = ----------- (Amp/Volt), R1 in Kohm
100 + R1
Ic - amplifier rated continuous current
The current gain of the differential input for R6=R7 (current mode) is given by:
6.66xIc
Gc
d
= --------- (Amp/Volt)
R7
R7 in Kohm
The current gain in velocity mode is given by (place the appropriate Gc for
each input):
50 x Gc
Gv = ---------- (Amp/Volt),
R11
R11 in Kohm
The maximum input voltage at terminal 1 is calculated by:
V1max= 8 + 0.08R1 (Volts), R1 in Kohm
The maximum input voltage at terminal 3,4 is calculated by:
Vdmax= 8 + 0.8R6 (Volts), R6=R7 in Kohm