TCY-FT-U
Configuration
Doc: 70-00-0128B, V1.2, 20110621
© Vector Controls GmbH, Switzerland
Page 6
Subject to alteration
Control Functions (Password 241)
Warning! Only experts should change these settings! See user parameters for login procedure.
Control configuration
Parameter Description
Range
Default
CP 00
Minimum setpoint limit in heating mode
0-60°C (32-160°F)
16°C (61°F)
CP 01
Maximum setpoint limit in heating mode
0-60°C (32-160°F)
30°C (86°F)
CP 02
Minimum setpoint limit in cooling mode
0-60°C (32-160°F)
18°C (65°F)
CP 03
Maximum setpoint limit in cooling mode
0-60°C (32-160°F)
30°C (86°F)
CP 04
Economy (unoccupied) Mode temperature shift:
The comfort (occupied) setpoint is shifted by the value set
with parameter. If heating is active the comfort setpoint will
be decreased, if cooling is active, the setpoint will be
increased. (Enable with UP06.)
0-100°C (200°F)
5.0°C (10°F)
CP 05
Dead Zone Span (TCY-FT4-U only):
The Dead Zone Span lies between the heating and the cooling
setpoint. The output is off while the temperature is within the
dead zone span. A negative dead zone is not possible.
0-100°C (200°F)
1.0°C (2°F)
CP 06
Heat/Cool Changeover Delay (TCY-FT4-U only):
A demand to switch between heating and cooling must persist
for the length of time set with this parameter before the
controller switches. Prevents activation of a sequence during a
short-term change in temperature in order to protect
equipment (with control overshoot for example)
0-255 min
5 min
CP 07
P-band heating X
PH
0-100°C (200°F)
2.0°C (4.0°F)
CP 08
P-band cooling X
PC
0-100°C (200°F)
2.0°C (4.0°F)
CP 09
K
IH
, Integral gain heating, in 0.1 steps, (TI is fixed to 4s)
0 disables ID part
low value = slow reaction
high value = fast reaction
0…25.5 0.0
CP 10
K
IC
, Integral gain cooling, in 0.1 steps, 0 disables I part
0…25.5
0.0
CP 11
Configuration of operation mode
0 = TCY-FT2-U-W1 = Cooling only
1 = TCY-FT2-U-W2 = Heating only
2 = TCY-FT2-U = Heating and Cooling (2 pipe system)
3 = TCY-FT4-U = Heating and Cooling (4 pipe system)
TCY-FT2-U: 0 - 2
TCY-FT4-U: 0 – 3
TCY-FT2-U-W1: 0
TCY-FT2-U-W2: 1
TCY-FT2-U:
2
TCY-FT4-U:
3
Î
Proportional control
(P-band)
The proportional control function calculates the output based on the difference between setpoint and measured value.
The proportional band (P-band) defines the difference between setpoint and measured value which will result in a 100%
output. For example, with a heating or reverse 0-10v control sequence, and a 2.0°C (4.0°F) P-band value, at 10v the
controller will be 2.0°C (4.0°F) below setpoint. This is the working range of the proportional control sequence.
Setting the proportional band to 0 disables proportional control.
Î
Integral and Differential control
Proportional control is a very stable control mode. The flaw of proportional control alone, however, is that the setpoint
is normally not reached. As the measured value gets closer to the setpoint, the output reduces until it reaches a point,
a fraction above or below the setpoint, where the output equals the load. To reach the setpoint and achieve a higher
level in comfort the Integral/Differential function should be activated.
Integral Gain (KI)
dynamically increases the output by the selected KI value until the setpoint is reached. The
challenge, however, is to prevent hunting, where the output increases too fast, the temperature overshoots the
setpoint, the output goes to 0, the temperature undershoots the setpoint, and the cycle repeats itself. Hunting may
result if the integral gain
is too high. Each system is different. It is recommended to start with a KI value of 0.5 for
water based systems and 1.0 for air based systems. Reduce this value if the measured value overshoots the setpoint
by more than 1°C (2°F). Increase the value if the output takes too long to reach the setpoint. Air based systems
react faster than water based systems.
Setting the integral gain to 0 disables integral and differential control.
