77
SP1B
SK73750/7
PG DRIVES TECHNOLOGY
12
5 Engineer Menu ?
Selection of this enters the ENGINEER menu and allows you to adjust the technical
performance parameters or functions of the controller. The ENGINEER menu is included
in the SP1b. Each parameter or function is described below.
5.1 Current Limit ?
This sets the current limit of the controller. The maximum value will depend on the
controller version you have, refer to the relevant data sheet.
You can set the current limit between 20A and the maximum value in steps of 1A.
5.2 Compensation ?
This matches the controller to different motor types in order to achieve optimal
performance and control, especially regarding anti-rollback and braking on gradients.
PGDT recommend that you set this value to 70% of the resistance of the motor
armature and all connectors and cables to it.
Motor manufacturers should be able to supply figures for armature resistance, and
typical cable and connectors would be about 40mΩ.
You can set this value between 0 and 1000mΩ in steps of 5mΩ.
Never set to greater than 70% of the total motor, cable and
connector resistance.
5.3 Hold Factor ?
This sets the amount by which the compensation is automatically increased during
the period between the controller detecting the vehicle is at zero speed and the
application of the solenoid brake. This is especially important in reducing roll-back
and roll-forward on gradients.
The value is expressed as a percentage of the Compensation setting. PGDT would
recommend a value between 150% and 200%. If the value is too low then the roll will
be excessive, if the value is too great then the vehicle may “twitch” prior to the brakes
being applied.
5.4 Mid Current ?
The controller’s current limit can be set to reduce after a period of time. Both the
reduction and the time period are programmable. This functions allows a measure of
protection for a motor when it gets into a stalled condition.
The current limit reduction is expressed as a percentage of the current limit and can
be set between 0 and 100% in steps of 1%. e.g. with a value of 100%, there will be no
current reduction; if the value is 25%, the current would reduce to 25% of the normal
current limit.
The time period for which the current limit is maintained can be set between 1 and
255 seconds in steps of 1 second. After the current reduction has occurred, the full
current limit level is resumed after 5 times this period. If the value for this time period
is set to 0 seconds, then no current reduction will occur.
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