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Revision 8.6
SECTION 3 : TRAVEL PARAMETERS
44
3.4.10
Neutral Plugging Voltage
NO
PARAMETER
DESCRIPTION
SCALE
INCREMENT
DEFAULT
10
Neutral Plugging V Neutral plugging Voltage
0% to 90%
5%
70%
Neutral plugging, when activated, makes use of dynamic reverse plugging to retard the Travel motion to
standstill. The magnitude of the plugging torque is proportional to the square of the plugging voltage
applied; therefore the voltage setting will have an effect on the smoothness of the motion operation.
It is suggested that in most applications a value not higher than 90% of supply voltage is used.
3.4.11
Neutral Deceleration Profile.
NO
PARAMETER
DESCRIPTION
SCALE
INCREMENT
DEFAULT
11
Neutral Decel P
2 to 20 sec
1 sec
5 sec
This parameter sets the ramp down profile when decelerating the motion back to Neutral (Stop) and
cannot be
disabled. In the event that “Coasting to Neutral” is required, the User may set the Neutral
plugging voltage (Parameter 10) to its minimum value. The Counter torque applied during deceleration
will be so low that it will hardly have any plugging effect, hence simulating Coasting.
Note:
The maximum plugging voltage that may be applied during Neutral deceleration is restricted by
Parameter 10 above. In the event that a quick deceleration is required the maximum Neutral plugging
voltage (Parameter 10 above), may have to be raised to enable the motor to receive as much Counter
torque as it is required to stop within the time span defined by the Neutral Deceleration Profile
parameter. Also note that if the motion is decelerating at a much quicker rate then the rate defined by
this parameter, the Thyromat will allow this faster stop to happen, preventing the application of any
driving torque to maintain the target deceleration profile.
3.4.12
Brake Plugging Voltage
NO
PARAMETER
DESCRIPTION
SCALE
INCREMENT
DEFAULT
12
Brake Plugging V
Voltage to apply when
plugging in the opposite
direction
50% to 90%
5%
70%
Brake plugging cannot be disabled. To activate Brake plugging the operator moves the joystick into any
notch in the opposite direction to the actual crane direction at the time. The voltage applied determines
the torque to be applied to retard the Travel motion. It is suggested that Brake plugging is always set to
a % Voltage higher than any one of the other two Plugging voltages mentioned above, but not higher
than 80%.
If the system requires a Braking voltage higher than 80% it may indicate weakness on other aspects of
the motion electrical design which may be solved by a complete analysis of the system by MH
Automation engineers.
