Parameter Settings And Adjustment - Honeywell MicroniK 200 R7426A Installation & Start-Up Instructions

R7426A,B.C Temperature Controller
Multistage ON/OFF Function YMode (C.11)
In the case of the R7426B controller with three floating
outputs, several ON/OFF sequence control functions can be
selected by the configuration parameter YMode (see Table
5).
In the case of the R7426B,C controller, the output Y1 can be
configured for two-position damper control by setting the
configuration parameter YMode to 4.
Table 5. Multistage Selection
Output Function
YMode
6-stage ON/OFF
1
sequence control
4-stage ON/OFF
sequence control 2
heating
4-stage ON/OFF
sequence control 3
cooling
15-stage binary
coded ON/OFF 5
sequence control H.
Two-position
4
damper control
Supply of Temperature Signal T2
T2ext (C.12)
The configuration parameter T2ext must be set to 1 if sensor
T1 is used also for high or low limit control. This inter-
connects the T1 and T2 input internally and the sensor must
be connected only to the T1 input.
Limit Type LimTyp (C.13)
The configuration parameter LimTyp allows the selection of
high or low limit control. High limit control is performed if
configuration parameter LimTyp = 1 and low limit control is
performed if configuration parameter LimTyp = 0.
Sensor Type Senstyp (C.14)
Three different sensor types can be used with the controller
(see Table 6).
Table 6. Sensor types
Automatic ID Temperature
of sensor type range
Pt 1000
-30....+130 °C
BALCO 500
-30....+130 °C
-30....+85 °C /
NTC 20kΩ
-30....+130 °C
1)
NTC sensor is detected automatically if, during power-
up, the sensor temperature is within -30....+85 °C and the
configuration parameter Senstyp = 0.
NTC sensor is selected manually if the configuration
parameter Senstyp is set to 1.
Automatic identification of sensor type is selected if the
configuration parameter Senstyp = 0 (default). After power
EN1B-0206GE51 R0602
Provided Function of
R7426
by output Y2
Y1,Y2,Y3 n.a. B
floating or
Y1,Y3 2-stage B
cooling
floating or
Y1,Y3 2-stage B
heating
floating or
Y1,Y3 2-stage B
cooling
Y2 and Y3
Y1 B,C
individual
Characteristics
1000Ω at 0 °C
500Ω at 23.3 °C
20kΩ at 25 °C
1)
up reset the controller detects automatically the type of
sensor, which is connected to the main temperature input T1.
For a correct auto detection, it is necessary that the
measured temperature is in the specified range (see Table
6). The same type of sensor must be used for all temperature
inputs (T1, T2 and T3).
PARAMETER SETTINGS AND
ADJUSTMENT
Main Setpoint W1 (P.01)
The main setpoint W is either set by the control parameter
W1 or by the external setpoint potentiometer if the
configuration paramter CPATYP = 3.
High/Low Limit Setpoint W
For high or low limit control, the control parameter W
used as setpoint.
During limit control, the throttling range Xp2 and reset time
tr2 are active.
Limit control will be active only if the T2 temperature signal
(control parameter T2ext = 0) is available or, alternatively, if
the sensor T1 (control parameter T2ext = 1) is used also for
limit control.
For cascade control the limit setpoint W
control point at which the submaster setpoint (W
maintains the limit value and is not shifted anymore by the
master control loop.
High or low limit control is in accordance with the
configuration parameter LimTyp (C.13).
Submaster Setpoint W
The R7426A,B,C controllers provide cascade control which
uses two control loops, master and submaster to maintain
the master setpoint (CTRP1).
This adjustment sets the control point of the submaster
control loop, discharge temperature (T2), at zero room
temperature deviation. If the room temperature deviates, the
submaster setpoint W
cas
Cascade control is disabled if the submaster setpoint W
set to OFF.
Reset Span Adjustment R
The reset span adjustment R
reset effect in degrees Kelvin, the submaster setpoint W
altered if the temperature (T1) deviates by 50% of the
throttling range Xp1.
Throttling Range Xp1/Xp2 (P.08 / P09)
Proportional band (throttling range X
the temperature change, required at the main sensor (T1)
and limit or cascade sensor (T2) to operate the output device
from full open (100%) to full closed (0%) or vice versa.
Xp1 is the throttling range for the main control loop, Xp2 is
used if limitation or cascade control (submaster control loop)
is active (see Table 7).
6
(P.02)
lim
determines the
lim
cas
(P.06)
cas
is automatically altered.
(P.07)
cas
determines the degrees of
cas
) adjustment determines
p
is
lim
)
is
cas
is
cas