Setting up & Commissioning
4-6
514C Product Manual
b) Before altering any connections make sure that all Auxiliary and Main power supplies
are totally isolated from the drive and equipment and that the motor is stationary.
15. Adjust the Speed Setpoint so that the Total Setpoint voltage is about 0.5 Volts (terminal T12,
Diagnostic 15).
Note:- If the Ramped Speed Setpoint is being used with default ramp settings the total
setpoint will take time to change.
Slowly increase the Main Current Limit setting (P5) up to about 20% FLC (i.e., not more that 1
volt at Diagnostic test position 24). Since the Total Setpoint is set to 0.5v the motor speed should
increase to only 5% of full speed. If this speed is exceeded, than the tacho polarity is wrong or
tacho scaling is incorrect, quickly turn the Main Current Limited (P5) to zero (anti-clockwise).
Initiate Stop and de-energise the controller.
If overspeeding occurred while using a tachogenerator for speed feedback correct wiring as follows:
Problem
Action
a)
b)
Direction correct but overspeeding:
Direction incorrect and overspeeding:
Reverse tacho polarity only
Reverse field polarity only
When armature voltage feedback is used for speed feedback it is direction insensitive and
overspeeding due to incorrect feedback cannot occur, excess speed is probably due to
incorrect feedback scaling, check setting of switches SW1 and SW2.
If the motor runs under control but in the wrong direction correct as follows either:-
a)
b)
Armature Control
Tachogenerator Control
Reverse Field polarity
Reverse Field and Tachogenerator Polarity
16. When the Main Current Limited (P5) set to about 20% FLC slowly increase the Total Setpoint
voltage to +1 volt (terminal T12, Diagnostic 15). The motor should now run at about 10%
Full Speed.
Note: When correctly connected and operating normally at constant speed the Speed Feedback
voltage (Diagnostic 16) will be equal to the Total Setpoint voltage (Diagnostic 15) but is of the
opposite polarity. Under these conditions the Speed Error voltage (Diagnostic 17) will be zero.
If this condition cannot be achieved, the system is probably in current limit (this is likely at this
stage if the output load is coupled to the motor shaft). Increase the setting of the Main Current
Limit (P5) slowly until the motor accelerates to set speed and the Speed Error signal falls to zero.
17. Adjust the Total Setpoint voltage to about -1v and check that the motor runs in control in the
reverse direction.
18. Set the Speed Setpoint to zero and adjust the Speed Zero preset potentiometer (P11) for
minimum shaft creep. (Alternatively the Speed Zero potentiometer may be used to adjust the
balance of maximum speed in forward and reverse directions).
19. Gradually increase the Speed Setpoint to maximum and check that the shaft speed is
nominally correct. Adjust P10 to desired speed. Check that the armature voltage does not
exceed rated value.
Note: If the load is connected to the motor it may be necessary to increase the Main Current
Limit control (P5) setting to achieve full speed.
20. Reverse the Speed Setpoint and check the maximum reverse speed.
21. Set the Main Current Limit (P5) to maximum. If in doubt monitor Diagnostic 24 and set to 5v
i.e., 100% current.
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