Scaime eNod4-B - Page 87

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User manual SCAIME: NU-soft-eNod4B-E-0716_236704-C.doc
• Weigh frame zero reference: reference value for zero per length unit. eNod4 determines this value during
dynamic zero procedure.
• Min permissible belt load: Minimum value for belt load for alarm function.
• Max permissible belt load: Maximum value for belt load for alarm function.
• Kp: A proportional controller (Kp) will have the effect of reducing the rise time and will reduce but never
eliminate the steady-state error.
• Ti: An integral control (Ti) will have the effect of eliminating the steady-state error for a constant or step input,
but it may make the transient response slower.
• Td: A derivative control (Td) will have the effect of increasing the stability of the system, reducing the
overshoot, and improving the transient response.
• PID behavior: eNod4 allows auto-adjustment of PID parameters (kp, Ti and Td). The PID behavior (slow, fast or
stable) must be set before to realize an auto-adjustment.
• Reference flow rate for PID adjustment: This is the reference flow rate value for auto-adjustment. It must be
set before sending adjustment command.
• Checked batch: After material test, user must fill in this register the real batch measuring by measurement
instrument before sending flow rate correction command.
• Instant flow rate: Instantaneous flow rate expressed in weight unit per time unit and based on current belt
load and speed.
• Average flow rate: The flow rate result of moving average filter on “n” Instantaneous flow rate samples and
low-pass filter. It has its own unity for external display purpose (remote display or HMI).
• Average belt speed: The speed result of moving average filter on “n” Instantaneous belt speed samples.
• Belt alarms registers: This register defines the status of alarms. The table below shows the bits definitions.
b
15
… b
0
bits set to 1
Meaning
b
0
Instantaneous flow rate > Max permissible flow rate
b
1
Instantaneous flow rate < Min permissible flow rate
b
2
Instantaneous belt speed > Max permissible speed
b
3
Instantaneous belt speed < Min permissible speed
b
4
Instantaneous belt load > Max permissible belt load
b
5
Instantaneous belt load < Min permissible belt load
b
6
Control output value > Max permissible control output
b
7
Control output value < Min permissible control output
b
8
Conveyor starting alarm flag
b
9
Conveyor calibration in progress
b
10
External totalizer output overflow
b
15
… b
11
Reserved (0)
• Totalizer value (Great WU): Main totalization result in weight unit x1000.
• Complementary totalizer value: Complementary totalization result in weight unit.
• Dosing weight deviation: This represents the weight deviation of belt system at current flow rate and at
nominal flow rate.