Samson TROVIS 5500 - Three-Step Control; On;Off Control

102 EB 5573-1 EN
System-wide functions
Note:
The condensate accumulation control function can only be activated when the control
circuit concerned is controlled using a PI algorithm (three-step control).
Functions WE Conguration
Control mode 1 CO1, 2, 4 > F12 - 1
Damping 0
2.0°C
CO1, 2, 4 > F13 - 1
Max. system deviation: 2.0 to 10.0°C
8.6 Three-step control
The ow temperature can be controlled using a PI algorithm. The valve reacts to pulses that
the controller sends when a system deviation occurs. The length of the rst pulse, in particu-
lar, depends on the extent of the system deviation and the selected 'KP (gain)' (the pulse
length increases as KP increases). The pulse and pause lengths change continuously until the
system deviation has been eliminated. The pause length between the single pulses is greatly
inuenced by the 'Tn (reset time)' (the pause length increases as TN increases). The 'TY (valve
transit time)' species the time required by the valve to travel through the range of 0 to
100%.
Functions WE Conguration
Control mode 1
2.0
120s
0s
45s
CO1, 2, 4 > F12 - 1
KP (gain): 0.1 to 50.0
Tn (reset time): 1 to 999s
TV (derivative-action time): Do not change this
value!
TY (valve transit time): 5, 10, 15, … , 240s
8.7 On/off control
The ow temperature can be controlled, for example, by activating and deactivating a boiler.
The controller switches on the boiler when the ow temperature falls below the set point by T
= 0.5 x 'Hysteresis'. When the set point is exceeded by T=0.5x'Hysteresis', the boiler is
switched off again. The greater the value you choose for 'Hysteresis', the less frequent switch-
ing on and off will be. By setting the 'Minimum ON time', an activated boiler remains
switched on during this period regardless of the ow temperature uctuations. Similarly, a
deactivated boiler will remain switched off regardless of the ow temperature uctuations if
the 'Min. OFF time' has been specied.
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