User manual

DIP SWITCHES
S1,S2 : LOAD INDUCTANCE SELECTOR. Set these two switches based on the
inductance of the load and supply voltage.
S1 S2 at 75V at 150V
On On 0.13 to 0.75 mH 0.25 to 1.5 mH
Off On 0.8 to 5 mH 1.6 to 10 mH
Off Off 5.1 to 20 mH 10.1 to 40 mH
S3 : VOLTAGE FEEDBACK. No effect when off. When on this switch substitutes
the output voltage divided by 25 in place of the tachometer, converting the amplifier
from a current to a voltage amplifier. If the gain of 25 is too high, use the Ref. Gain
trimpot to reduce the gain further.
S4 : ALTERNATE COMP. Typically the Ref. Gain pot will be set to fully CCW
when using this feature. This switch connects the output of the reference gain
differential amplifier to the Aux. Input internally. The servo preamp. Can then be
customized for special applications.
S5, S6 : GAIN SETTING. Set the switches according to the chart below. They adjust
the gain of the servo preamplifier.
S5 S6 Gain mode
On On Current mode
Off Off Velocity mode
Off On Medium Gain mode
S7 : IR COMPENSATION . Enables feedback from the current monitor when on.
This mode is an option when operating in voltage mode. IR compensation increases
the output voltage to compensate for the voltage drop across the motor’s armature
resistance. Normally this drop would decrease the motor’s RPM under cahnging load
conditions. IR compensation permits a relatively constant velocity operation without a
tachometer.
S8 : NORMAL POLARITY . This switch changes the polarity of the Normal / Fault
output. With S8 off, a normal condition turns the output On. When S8 is On, the logic
is reversed and a fault condition turns the output On.