IOM CRUZcontrol®
P/N: 90480009
Revision Date: 03/18/2019
Page
45
of
58
TGW Systems Controls Guidelines See following pages.
TGW Systems Controls Guidelines
ECG 2.3
Rev. 5.20.08
CRUZcontrol Applications
This guideline provides various suggestions on how to apply CRUZcontrol to meet some specific control
requirements. For CRUZcontrol general information and specifications, refer to the CRUZcontrol
Installation, Operation, and Maintenance Manual. This ECG assumes that the reader has a good
understanding of the topics covered in that manual. Unless stated otherwise, the controls techniques as
described in this ECG are applicable to both NBA 23 and XenoROL® applications of CRUZcontrol.
Example 1:
Applying Progressive CRUZcontrol. While this example is based specifically on NBA®23,
the principals covered also apply to XenoROL. The CRUZcontrol manual states the following:
“CRUZcontrol Logic Assemblies are designed to be fail-safe. A loss of module power, a disconnected or
severed cable, or a dirty or failed photoelectric sensor will all result in the stopping of a zone, initiating
accumulation beginning from the affected zone.
With Progressive Logic, failure of a Logic Assembly to function properly could possibly result in product
accumulating with zones not stopping as required. While this should be unlikely due to the fail-safe
nature of the Logic Assembly, the effects of such a failure should be considered. This type of failure
could result in excessive line pressure, eventually causing product to push through the discharge zone
of the conveyor. Jam detection sensors should be used as appropriate to minimize the effects of such a
failure. “
A product jam on the conveyor, stopping the free flow of product, could also create a situation where
Progressive CRUZcontrol can’t function properly due to product not blocking one or more of the
photoelectric sensors. This would probably be the most common cause of excessive line pressure
resulting from the use of Progressive CRUZcontrol.
A solution to this problem is to provide one Basic Logic Assembly at the discharge end of every 12-foot
bed of conveyor. This would limit the length of conveyor that could possibly be driving product against a
jam point to under 12 feet.
The use of one Basic Logic Assembly on every 12-foot bed will disrupt the flow of product to some degree,
but with adequate speed and product weight the flowing product should coast through the basic zones
without any noticeable effect on the throughput rate. One exception is at the charge and discharge ends
of a length of NBA 23, where the effects of using Basic Logic Assemblies on the throughput rate needs
to be considered. If there is a need to maximize throughput rates, the use of all Progressive Logic
Assemblies should be retained in those locations.
CRUZcontrol does provide an option for slug release. Both the Basic and Progressive Logic Assemblies
will release at the maximum possible discharge rate when slug release is enabled. It will also create a
situation where a product jam could result in excessive line pressure buildup. If the slug release feature
is used, it should be used with caution, and for a limited number of successive accumulation zones.
Example 2:
Accumulation control around a curve, where the curve rollers don’t ever stop. Product
should never accumulate on the curved section of the conveyor. The conveyor shown is NBA 23, with
the curve being driven through a power takeoff.
Conveyor Flow
