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9
ISP - Rev 6/95
The current gain of the differential input in velocity mode is given by:
266 x Ic
Gvd = ---------------- (A/V)
R3 x R6
R3,R6 in Kohm
The maximum input voltage at terminals 1 or 5 is calculated by:
Vin
max
= 10 + 0.6Ri (Volts)
Ri in Kohm
The maximum input voltage at terminals 3,4 is calculated by:
Vd
max
= 10 + R3 (Volts),
R3=R4 in Kohm
4.2 Velocity mode
In this mode op amp U1/A is employed as a high gain error amplifier The
amplifier sums velocity command and the tachogenerator feedback signal, and
provides the necessary servo compensation and gain adjustments, resulting in
stable, optimum servo operation.
This op amp is configured with two feedback paths:
One, in the form of a resistive T network, controls the DC gain of this
amplifier. The equivalent value of a T network is given by:
10
10
Rf= --------
R6
Resistor R6 is mounted in solderless terminals so it can be changed easily
whenever the DC gain of the error amplifier is to be changed. The AC gain is
controlled by C1, R5 and COMP trimmer. Maximum AC gain is obtained with COMP
trimmer set fully CW. Setting COMP trimmer fully CCW removes AC gain and no lag
in response occurs. R5 and C1 are mounted in solderless terminals and can be