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Start-up 4-5MN894
High Friction Load with Voltage Ramp (S2-2=OFF, S2-4=OFF)
Typically used for loads that require high breakaway torque and low acceleration torque;
i.e., conveyors in icy environment, equipment that resists starting due to lack of use,
traction loads, etc.
1. Set RU, TU, PT, RD, TD and PF fully counterclockwise (CCW).
2. Adjust PT clockwise sufficiently to start load slowly moving at moment of
switching.
3. Adjust TU clockwise sufficiently to keep load moving after starting pulse.
4. Adjust RU clockwise to achieve desired starting time with normal load
conditions.
Note: Proceed to “Running Adjustment Procedure” if ramp down is not used.
5. Adjust TD clockwise sufficiently to cause the load to slow down soon after stop
button is pressed, with normal load conditions.
6. Adjust RD clockwise to achieve desired stopping time with normal load
conditions.
Running Adjustment Procedure:
After adjusting the starting and stopping characteristics, current monitor/trip (CM)
and power factor adjustment can be made. If the power factor circuit is not used,
turn the PF adjustment fully counterclockwise.
1. Use an ammeter to measure motor running current.
2. With the motor at full speed, minimum load and “Ramp End” light on, adjust PF
clockwise to minimize running current without oscillation. If there is no
noticeable drop in current, repeat this step while measuring motor voltage.
Current Monitor/Trip (CM):
1. Press start and allow the motor to reach full speed and the “Ramp End” light to
turn on.
2. Adjust CM to desired threshold by observing the “CUR MON” light.
3. The “CUR MON” contact can be used to signal this threshold, or by setting the
S2-2=ON, the starter will shut down. Press stop to reset the shutdown and trip
condition.
Post Adjustment Check List
1. Check fans for proper operation.
2. If bypass contactor is used, check to ensure that the contactor is closing at
Ramp End.
3. Using a current probe, measure current on all three motor phases. Be sure the
current is balanced during ramp up, run and ramp down.
4. With the motor in run mode (Ramp End light “ON”), check phase current of all
three phases. Currents should be balanced and within nameplate FLA.
5. Measure the line voltage at the control during ramp up to ensure voltage does
not drop below minimum operating voltage.