RMA
Member
This is slowly driving me nuts!
I've got two loops to control in my current project:
1) Steam pressure, for which I'm using FB41
2) Temperature control of cooling water, for which I'm using FB41
I'm using values for Gain and I-time from the customer (no D-time), in the 2nd case the gain is negative because it's a cooling loop.
I'm pretty sure I've got all the parameters set correctly and both controller blocks are sitting there glowing green and apparently running, but I can vary the Setpoint and PV values any way I like but the output - LMN_PER remains stubbornly at 0, or to be precise, in the case of FB58 at the 25% which is the minimum value for the cooling water regulator valve.
Has anybody any thoughts on what the problem might be?
PS, I haven't listed all the parameters, because it's a bit too much, but, yes, P_SEL and I_SEL are both set to "1".
I've got two loops to control in my current project:
1) Steam pressure, for which I'm using FB41
2) Temperature control of cooling water, for which I'm using FB41
I'm using values for Gain and I-time from the customer (no D-time), in the 2nd case the gain is negative because it's a cooling loop.
I'm pretty sure I've got all the parameters set correctly and both controller blocks are sitting there glowing green and apparently running, but I can vary the Setpoint and PV values any way I like but the output - LMN_PER remains stubbornly at 0, or to be precise, in the case of FB58 at the 25% which is the minimum value for the cooling water regulator valve.
Has anybody any thoughts on what the problem might be?
PS, I haven't listed all the parameters, because it's a bit too much, but, yes, P_SEL and I_SEL are both set to "1".
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