Siemens Milltronics BW500, Operating Instructions Manual

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Operation
8.10 Totalization
BW500 and BW500/L
104
Operating Instructions, 12/2016, A5E33482052-AD
8.10.2 External Totalizer
● 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
1)
resolution parameters.
1)
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: P005 = 1 (t/h), P631 = 4
Then: totalizer count increments by 10 for each 10 metric tonnes registered
● External totalizer 1
Given: P005 = 1 (t/h), P638 = 5
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.