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4
Special Functions
Configuring the Control as a BMC
4.1
In certain applications it may be necessary to eliminate the motor Run-
On-Time which is a part of the Search & Rescue function (see section
4.3 below). To accomplish this, the control can be configured as a
Basic Motor Control (BMC) or standalone motor control.
accomplish this implement the following steps;
1)
Place control DIP switch 3 in the ON position (slide the switch to
the right)
2)
On the GREEN 3-pin sensor connector, wire the sensor input
(center pin) to the sensor + voltage (pin on the right).
3.
Apply a 24Vdc signal to the Slug Mode input (I/O pin 2) to start
and stop the motor.
4.
When the Slug Mode input goes high then I/O pin 4 will go high
to indicate that the motor is running.
5.
I/O pin 4 will float at approximately 13Vdc when it goes "low".
To force I/O pin 4 to go to 0Vdc, connect a 10K ohm, 1/2W
resistor between I/O pin 4 and 0Vdc.
Shunt Input
4.2
The Shunt Input can be used during regen operation to
increase the control's overvoltage shutdown limit.
When the Shunt Input is active high (voltage > 18Vdc), the
control's over-voltage shutdown limit is increased from 29Vdc
to 31Vdc providing additional operating margin before the
control shuts down due to an over-voltage condition.
A separate 6A, 10W Shunt Regulator module is available (ACG P/N
110547) and connects directly to the +24V DC power supply. This
module can be used, to limit any increase in the +24V DC power
supply voltage to less than 28Vdc, in the event that the motor and
control regenerate energy back into the power supply.
Search and Rescue
4.3
This function has been added to the control in order to avoid
situations where parcels could become stranded between photo
sensors, creating a nuisance at the very least. This function is
active after the following events:
§ During Power Up
§ After Discharge of a Parcel from the Downstream Edge of a Zone
§ After Removal of a Slug Mode Signal (if Reverse Slug is Not Active)
§ After Removal of a Rev Slug Signal (if Slug Mode is Not Active)
During Power Up
4.3.1
When power is first applied, each control goes through a self-
check and reports its firmware revision as described in 5.2
Firmware Version Display.
Beginning at the Exit end and then flowing zone by zone after
very brief intervals to avoid creating high inrush current at the
power supply, each zone then runs for a period of time (Run-
on-Time), or until a parcel arrives at the respective zone
sensor, whichever comes first.
In this fashion, any parcels that may have been stranded
between sensors when power was removed are discovered
To
and will then be processed by the conveyor in either ZPA or
ZIP control mode as determined by the switch settings.
NOTE: 2.5 seconds is the nominal Run-On-Time when the
controls are set for maximum speed. This time is increased
if zones are set to a lower speed than maximum speed.
For example, if a zone is set to half its maximum speed,
the nominal Run-On-Time is doubled to 5.0 seconds.
After Discharge of a Parcel from the
4.3.2
Downstream Edge of a Zone
It is not unusual for operators who are manually loading
parcels onto a conveyor to place two small parcels in a single
zone. If the zone stopped immediately after a parcel passed
its downstream sensor the second parcel could become
stranded.
Therefore, each zone will operate for the additional period of
time (Run-On-Time) after these events.
This is a local function that directly affects only the zone that
just discharged its parcel.
After Removal of a Slug Mode Signal
4.3.3
(If Reverse Slug is Not Active)
During Slug mode of operation, parcels are not tracked by the
system logic. Some parcels will likely be between sensors at
the time the Slug signal is removed.
Beginning with the zone where the Slug signal was asserted
and cascading upstream, each zone will run for an additional
period of time (Run-On-Time) until either the time expires or
a parcel is discovered.
After Removal of a Rev Slug Signal
4.3.4
(If Slug Mode is Not Active)
Since Reverse Slug causes the zones to coast, parcels that
were in motion will come to rest in more or less random
locations.
Beginning with the zone where the Reverse Slug signal was
asserted and cascading upstream, each zone will run for an
additional period of time (Run-On-Time) until either the timer
expires or a parcel is discovered.
ZoneLogix Plus ACG P/N 301208 July 23, 2021 Page 9
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