SAFTRONICS
3
2.2 Electrical Protection
2.3 Mechanical
2.4 Adjustments
· Fusing
One fast-acting fuse in each AC leg.
· Current limit
Adjustable current limit circuit 0 - 125%.
· Surge suppression
MOV surge suppressor.
For dimensional information see page 13.
· RV1 Acceleration
This control adjusts both acceleration and deceleration time. In the
fully clockwise position, acceleration/deceleration time is 0.1
seconds, and in the fully counter-clockwise position, acceleration/
deceleration time is 30 seconds.
· RV2 Current stability
This control, which has been factory preset, adjusts the stability
of the current loop.
· RV3 Voltage stability
This is factory preset and very seldom needs adjustment. If the
motor should hunt, rotate this trimpot until the motor runs
smoothly. The normal position of this trimpot is approximately
1/5 turn clockwise.
· RV4 IR Compenstaion
Factory set to CCW for Tach Feedback, this control rarely needs
to be used. However, when using armature voltage feedback with
cyclical loading applications where there is a speed drop due to
operation from high to low load, the IR Comp adjustment
corrects for voltage changes inside the DC motor when load is
applied. If speed variations with load are a problem, set the
SPEED control knob to the desired operating speed. Now load
the drive. Adjust RV4 until the motor speed returns to its unloaded
speed. Remove the load and ensure motor speed is stable.
· RV5 Current limit
This control is preset at factory and seldom needs field adjustment.
· RV6 Maximum speed
This adjustment is used to set the maximum armature voltage or
motor speed.
· RV7 Minimum speed
This control sets the minimum armature voltage or motor speed.
CAUTION: Adjusting
RV4 to over 50% clock-
wise rotation, may cause
drive instability which
cannot be corrected by
RV3 voltage stability. In
such a case, back off
slightly from the position
where RV4 causes insta-
bility. This may result in
a slight decrease in speed
holding.
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