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NRT405F901 manual Chapter 11 Types of actuators 24
Chapter 11 Types of actuators
NRT405F901 can be used with two types of actuators:
•
Thermal actuators
•
3-point actuators (Increase/decrease actuators)
The type of actuator is configured using NRT tool or in the parameter menu of the display.
Thermal actuators When control of a thermal actuator has been selected, it is controlled digitally through output
DO... via time proportional pulses. By pulsing, the degree of opening of the actuator (and its
valve) is varied. The period time (in seconds) equals the sum of output on time and output
off time. The factory setting (FS) for period time is 60s. The controller varies output on time
and off time proportionally, depending on the output signal requirements of the actuator.
3-position actuators For 3-position actuators, two digital outputs (DO4/DO5) are used for control of a single
actuator; one output controlling opening the actuator and another closing it. The run time (in
seconds) can be configured for different actuators (FS=120 s).
Exercising All actuators, independent of type, are exercised. This is performed by the controller at a set
interval measured in hours (FS=23 hour interval). Exercising means a signal to open is sent
to the actuator for as long as the actuator’s configured run time. A signal to close is then sent
for an equal amount of time, after which exercising is completed.
The interval between exercises is set in parameters 22 and 23. If the parameter is set to ”0”,
the function is deactivated.
If an electric heater has been selected, no exercise will take place.
Number of
parameter
Description
Factory
setting
22 Time (in hours) between exercise of heating actuator 23
23 Time (in hours) between exercise of cooling actuator 23