Block Diagram; Thermostat And Controller Function; Thermostat; Pid Two-State Controller - JUMO miroTRON Operating Manual

2.4

Block diagram

Analog input
2-wire RTD temperature probe
Pt100, Pt1000
3-wire RTD temperature probe
Pt100, Pt1000
Thermocouples
Fe-CuNi "L" Fe-CuNi "J", NiCr-Ni "K" ,
0(4) to 20 mA
0 to 10 V
Digital input
Digital input for potential-free contact
(not with 3-wire circuit)
Voltage supply
- AC 230 V +10/-15 %, 48 to 63 Hz
- AC 115 V +10/-15 %, 48 to 63 Hz
- DC 12 to 24 V
Factory default
2.5

Thermostat and controller function

In addition to the standard thermostat function, the devices can also be used as PID two-state control-
lers, including autotuning according to the oscillation method.
The PID two-state controller can be ordered as an extra code or can be activated retrospectively via the
setup program.
2.5.1

Thermostat

The thermostat function monitors the analog input to check it keeps to the configured thermostat setpoint
value and, at the thermostat output, based on the function for heating or cooling, gives the signal for
switching off or on, e.g. for a device downstream of the digital output (e.g. heating or cooling unit).
NOTE!
In order not to overload downstream units, both the minimum switch-on period and the minimum switch-
off period can be configured. See "Thermostat", Page 50
2.5.2

PID two-state controller

The PID two-state controller implemented in the device has a switching output and can be parametrized
with
P, I, PD, PI, or PID transmission behavior. In order for the controller structure to take effect, the propor-
tional band must be X
2.5.3

Autotuning

For the purpose of using the device as a two-state controller, an autotuning function has been integrated
into the device software. The autotuning function works according to the oscillation method. With this
method, the device sets the output level alternately to 100 % and 0 %, which produces oscillation of the
control variable.
In the case of a large control deviation between the setpoint value and actual value (for example, in the
startup phase), the controller determines a switching line around which the control variable performs a
forced oscillation during autotuning. The switching line is determined so that the actual value does not
exceed the setpoint value if possible.
or
or
or
or
±
15 %
Options
> 0.
p
Setup interface
USB device
PID two-state controller
Digital outputs 701080
1 relay (changeover AC 250 V, 10 A)
1 relay (NO contact AC 250 V, 5 A)
or
1 relay (changeover AC 250 V, 10 A)
1 digital output DC 0/14 V
Digital outputs 701081
4 relays (NO contact AC 250 V, 2.5 A)
LCD display
Membrane keypad
2 Description
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