User manual

PID Loop Operation
(DL450 Only)
Maintenance
8--57
PID Loop Operation (DL450 only)
DL405 User Manual, 4th Edition, Rev. A
The parameters in the ramp/soak table must be user--defined. the most convenient
wayistouseDirectSOFT, which features a special editor for this table. Four
parameters are required to define a ramp and soak segment pair, as pictured below.
S Ramp End Value y specifies the destination SP value for the end of
the ramp. Use the same data format for this number as you use for the
SP. It may be above or below the beginning SP value, so the slope
could be up or down (we don’t have to know the starting SP value for
ramp #1).
S Ramp Slope y specifies the SP increase in counts (units) per second.
It is a BCD number from 00.00 to 99.99 (uses implied decimal point).
S Soak Duration y specifies the time for the soak segment in minutes,
ranging from 000.1 to 999.9 minutes in BCD (implied decimal point).
S Soak PV Deviation y (optional) specifies an allowable PV deviation
above and below the SP value during the soak period. A PV deviation
alarm status bit is generated by the ramp/soak generator.
Ramp/Soak Table
V+00 Ramp End SP ValueXXXX
SP
Soak PV
deviation
V+01 Ramp SlopeXXXX
V+02 Soak DurationXXXX
V+03 Soak PV DeviationXXXX
Ramp End
SP Value
Soak
duration
segment becomes active
Slope
The ramp segment becomes active when the previous soak segment ends. If the
ramp is the first segment, it becomes active when the ramp/soak generator is
started, and automatically assumes the present SP as the starting SP.
Addr
Offset
Step Description
Addr
Offset
Step Description
+00 1 Ramp End SP Value +20 9 Ramp End SP Value
+01 1 Ramp Slope +21 9 Ramp Slope
+02 2 Soak Duration +22 10 Soak Duration
+03 2 Soak PV Deviation +23 10 Soak PV Deviation
+04 3 Ramp End SP Value +24 11 Ramp End SP Value
+05 3 Ramp Slope +25 11 Ramp Slope
+06 4 Soak Duration +26 12 Soak Duration
+07 4 Soak PV Deviation +27 12 Soak PV Deviation
+10 5 Ramp End SP Value +30 13 Ramp End SP Value
+11 5 Ramp Slope +31 13 Ramp Slope
+12 6 Soak Duration +32 14 Soak Duration
+13 6 Soak PV Deviation +33 14 Soak PV Deviation
+14 7 Ramp End SP Value +34 15 Ramp End SP Value
+15 7 Ramp Slope +35 15 Ramp Slope
+16 8 Soak Duration +36 16 Soak Duration
+17 8 Soak PV Deviation +37 16 Soak PV Deviation