Procedure For Setting The Control Parameters For Internal Control - Lauda Integral XT 150 Operating Instructions Manual

Integral XT
7.15.3.1

Procedure for setting the control parameters for internal control

1. Choose a set of control parameters from the table of control parameters (þ 7.15.3.2).
2. Adjust the setpoint by 5 °C (5 K setpoint step change) and record the outflow temperature for
at least 5 minutes.
3. If the outflow temperature oscillates (>0.1 K), then enlarge
away. Always wait a number of minutes between the changes.
4. +20 K setpoint step change, await transient response,
-20 K setpoint step change, await transient response.
5. Assess transient responses:
- if an overshoot is to be reduced, then slowly increase Tv (until about 90 % of Tn),
- if settling is too slow, then reduce Tv to about 60 % of Tn,
- always adjust Td:
- after each change repeat Point 4. Carry out and evaluate ±20 K setpoint step changes.
6. If the response takes too long, then Tn can be reduced. Similarly reduce Tv, Td as a per-
centage. Reduce
7. If the tendency to oscillate increases without the overshoot being acceptably reduced, then
a)
b) larger time constants should be chosen: Increase
and
7.15.3.2 Table with control parameters and pump level for internal control
Outflow
control
Device type
XT 150,
XT 250 W
XT 750 H,
XT 950 W
Description
a) 20 m pipe, D = 10 mm (internal), bypass used.
b) 20 m pipe, D = 10 mm (internal), bypass used.
c) Glass double-shell reactor with 4 liters, uninsulated, thermostatic oil in the reactor, 2 x 1.5 m metal
corrugated hose D = 10 mm (internal).
d) Metal double-shell reactor, 17 liters of thermostatic oil in the reactor, 2 x 1.5 m metal corrugated
hose D = 20 mm
e) Glass double-shell reactor with 4 liters, uninsulated, thermostatic oil in the reactor, 2 x 5 m metal
corrugated hose D = 10 mm (internal), bypass used.
YAWE0028 / 24/06/2016
Td = 20 % of Tv,
Xp to 70...50 % so that the system oscillates. Then continue from Point 2.
Xp can be slightly increased; continue with Point 3,
Xp to 70...50 % so that the system oscillates. Then continue from Point 2.
Heat transfer liquid
in the outflow
KRYO 30
KRYO 30
KRYO 55
KRYO 55
KRYO 55
Xp
External ap-
plication
_P
a) 30
b) 40
c) 30
d) 50
e) 80
Starting up
Xp until the oscillation dies
Tn , Tv , Td by 30...80 %,
Tn Tv Td
tn tu td
80 68 15
100 84 18
50 40 8
50 40 8
100 85 16
Pump level
6
4
3
8
5
95