Totalization - Siemens milltronics BW500 Instruction Manual

Totalization

The totalization function is based on the internal rate (mass per unit time) signal
proportional to belt speed and load on the associated belt scale. It is not affected by the
damping function (P080). The rate signal is sampled several times a second to accurately
count the mass of material conveyed. The count is held in the master totalizer used to
increment the internal totalizers and to produce a pulse signal for the remote totalizers.
The BW500 provides several separate totalizer functions:
Internal totalizers
• local display (totalizers 1 and 2)
• verification totalizer (totalizer 3)
• material test totalizer (totalizer 4)
• batch total (totalizer 5)
External totalizers
• totalizer outputs (remote totalizers 1 and 2)
To avoid totalizing material at flow rates below the low flow rate limit, the totalizer drop
out limit (P619) is set to a percentage of the design load. Below this limit, totalization
stops. When material flow returns to a rate above the drop out limit, totalization resumes.
Totalizer resolution or count value is set by the respective internal (P631) and external
(P638) totalizer* resolution parameters.
*If the resolution selected causes the totalizer to lag behind the count rate, the next
possible resolution is automatically entered.
Example:
Internal totalizer 1
Given:
Then:
External totalizer 1
Given: P005 = 1 (t/h)
Then: contact closure occurs once for every 10 metric tonnes registered
For remote totalization, the contact closure duration (P643) is automatically calculated
upon entry of the design rate (P011) and remote totalizer (P638) parameters, so that the
duration of contact closure allows the relay response to track the total up to 150% of the
design rate. The value can be changed to suit specific contact closure requirements, such
as in the case of programmable logic controllers. If the duration selected is inappropriate,
the next possible duration is automatically entered.
7ML19985DK03 Milltronics BW500 - INSTRUCTION MANUAL
P005 = 1 (t/h)
P631 = 4
totalizer count increments by 10 for each 10 metric tonnes registered
P638 = 5
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