DART Controls MPD CONTROL Serie Manuel D'instructions page 24

Mode 5: Active When Display Value Outside Range
The alarm output will activate when the displayed value is less than the lower limit setting
or greater than upper limit setting.
Mode 6: Active When Target (Display) = Zero
The alarm output will activate when the displayed value is equal to zero. This allows the
alarm output to be used to drive a mechanical brake to decrease stopping time or to
provide holding torque at zero speed.
Mode 7: Active When Main Pickup Signal (S1) Stalled or stopped
The alarm output will activate when the main pickup signal input (S1) has stalled or
stopped. The alarm lower limit (Parameter 57) is used to specify the stall timeout, in
seconds, under a motor stall condition. When using the lower limit to set the stall timeout,
an inhibit command or zero speed command will not be recognized as a stall condition.
The pickup is considered to have stalled if the timeout passes with no pickup pulses when
the target (displayed) value is greater than zero and the control has not been given an
inhibit command. The alarm upper limit (Parameter 58) is used to specify a zero speed or
stopped timeout condition in seconds. When using the upper limit to set a zero speed or
stopped timeout, an inhibit command, a zero speed command or a motor stall condition
will all be recognized as a stopped condition. The pickup is considered to have stopped
after the timeout passes with no pickup pulses.
Note: When using the upper limit to set a stopped timeout the lower limit should
be set to zero.
Mode 8: Active When Driving At Maximum Conduction Angle
The alarm output will activate when the control is driving the motor at the maximum
conduction angle. This can be used to determine if the control is running away due to a
broken pickup signal wire when stall-detection is not desired.
Parameter 51 – Alarm 1 Output Style & Reset Confi guration
This setting confi gures the output mode and reset method for the alarm output.
Mode 1: Constant & Auto Reset
In this mode, the alarm output will remain active until the alarm condition ceases to exist.
The alarm will automatically reset when the conditions return to normal.
Mode 2: Constant & Manual Reset
In this mode, the alarm output will remain active until the alarm is reset manually. See
parameter 52 for details.
Mode 3: Pulse & Auto Reset
In this mode, the alarm output will pulse on and off until the alarm condition ceases to
exist. The pulsed modes are commonly used for audible alarms where a constant output
would be considered distracting or awkward. The alarm will automatically reset when the
conditions return to normal.
Mode 4: Pulse & Manual Reset
In this mode, the alarm output will pulse on and off until the alarm is reset manually. See
parameter 52 for reset details. The pulsed modes are commonly used for audible alarms
where a constant output would be considered distracting or awkward.
Parameter 52 – Alarm 1 Reset Confi guration
This setting determines which actions will cause an active alarm to be silenced or reset.
Mode 1: No Silencing, Reset On Any Button Press
In this mode, an active alarm cannot be silenced. Once the alarm condition ceases to
exist, however, any user-interface button may be pressed to cause a manual reset.
Mode 2: No Silencing, Reset On S2 Input High (Not Wired To Common)
Similar to Mode 1. Once the alarm condition ceases to exist, setting the S2 input to a
high (+5V) state or allowing it to fl oat disconnected will cause a manual reset.
Mode 3: No Silencing, Reset On S2 Input Low (Wired To Common)
Similar to Mode 1. Once the alarm condition ceases to exist, setting the S2 input to a
low (COM) state or wiring it to common will cause a manual reset.
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