Lauda E 4 G - F.2.2 Procedure for setting the control parameters for external control

ECO GOLD
102 Appendix with settings 25/08/2011/ YACE0088
F.2.2 Procedure for setting the control parameters for external control
1. Activating external control (Ì D.1).
2. Set the slave controller:
2.1. Parameter to auto ;
Xpf in dependence of:
− Check or adjust device type (Ì 8.2.4).
− Select heat transfe
r liquid with as low-viscosity and with as high a thermal capacity as possible.
Ranking list: Water, water/glycol, oils, Fluorinert®.
− Set pump level as high as possible,
− Make sure there is adequate circulation,
− select the hose length as short as possible, e.g. 2 x 1 m,
− select the hose cross-sectional area as large as possible, e.g. ½ inch,
− set the throughput through the external consumer as large as possible.
2.2. Set Xpf:
− With a tendency to oscillate with a short period of oscillation (e.g. 30 s) Î Xpf smaller, otherwise
larger,
− with poor thermal coupling and a large mass to temper Î large (e.g. 2...5, possibly even larger),
− with good thermal coupling and a small mass to temper Î small (e.g. 0.2...0.7),
− if fast temperature changes are required, external baths should be controlled if possible with in-
ternal control. Otherwise choose Xpf to be very small (0.05 ... 0.1).
3. Setting the master controller (PID controller):
− First start with Auto, then possibly continue with manual.
3.1. Setting Kpe:
− With a tendency to oscillate (long period of oscillation, e.g. 10 min) Î Kpe larger, otherwise
smaller,
3.2. Setting Tne/ Tve/ Tde:
− Generally quite high values (Tne = 70 s ... 200 s; Tve = 50 s ... 150 s),
− with smaller values Î faster transient responses, otherwise slower transient responses and
therefore less oscillation,
− Tve: To reduce transients Î increase Tve, otherwise vice versa,
− Tde (damping for Tve): generally approx. 10 % of Tve.
4. Correcting quantity limit (Ì F.2.1) and temperature limits (Til/Tih) (Ì 7.4.5).
−
Set accordi
ng to the physical boundary conditions.
Example:
Heat transfer liquid Correcting quantity limit Til Tih
Water
depends on heat transfer liquid and vessel
5 °C 95 °C