Watlow Series F4P Temperature/Process Controller

(2) Output type and specifications

The output is divided into control output (driving actuator), alarm output (fault linkage), and retransmission output (signal forwarding), supporting multi output collaborative work:

Output type quantity, key parameter configuration points, applicable scenarios

Control output (1A/1B) 2-channel - mechanical relay (Form C): 2A/250V AC or 30V DC, 100000 cycles life, no contact suppression

-Solid state relay (SSR): 0.5A/24-253V AC, zero crossing trigger, optical isolation, leakage current ≤ 10 μ A

-Open collector: 42V DC/0.5A, requires external power supply, supports switching DC loads

-Process output: 4-20mA DC (maximum 800 Ω load) or 0-10V DC (minimum 1k Ω load), accuracy ± 30 μ A/± 15mV, supports "D ú plex" (dual-mode, such as heating/cooling bidirectional control), in "P á gina Configuraci ó n>Salida control x", set "Funci ó n" (functions, such as "Calor" and "Fr í o"), "Tipo del tiempo del ciclo" (cycle type: fixed/variable), "Proceso" (process output range) to drive actuators such as heaters, refrigerators, valves, frequency converters, etc., such as PID regulating heating power and valve opening control

Alarm output 2-channel mechanical relay (Form C): 2A/250V AC or 30V DC, supports "Autoborrado"/"Enganche" modes, can be associated with process/deviation/rate alarms. Set "Tipo de alarma" (alarm type), "Lados de alarma" (high and low end triggering), "L ó gica de alarma" (normally open/normally closed) fault linkage (such as overheating to cut off power, triggering buzzer), status prompt (such as running/standby indication) in "P á gina Configuraci ó n>Salida de alarma x"

Resend output (optional) 1-2 channels of same process output, can resend input signals or control output signals, supports "Compensataci ó n de escala" (range offset) in "P á gina Configuraci ó n>Salida de retracns x" setting "Fuente de retracmisi ó n" (signal source, such as input 1, control output 1A), "Rango anal ó gico" (output range) signal forwarding to recorders, PLCs or other controllers, such as retransmitting temperature signals to SCADA systems

2. Control and computation functions (core algorithms)

(1) Basic control mode

F4P supports switch control and PID control, adapting to different precision requirements scenarios. Parameters can be configured through "P á gina Operaiones":

Applicable scenarios for key parameters of control mode core logic

On Off control is based on the set point and hysteresis to start and stop the output: if the temperature is higher than the set point+hysteresis → turn off the heating; Below the set point - hysteresis ->turn on heating - Hist é resis (hysteresis): 1-9999 units, avoid frequent switching

-Need to set 'Banda proportional' to 0 (disable PID) for low precision control, such as insulation boxes and small heating equipment

Proportional control (P) output power is proportional to deviation: deviation=set point - process value, output power=(deviation/proportional band) × 100%, with static deviation ("Ca í da") - Banda proportional (proportional band): 0-30000 units, the smaller the proportional band, the higher the gain

-Suitable for medium precision control in scenarios without static deviation requirements, such as fan speed regulation and simple heating control

Proportional integral control (PI) adds an integral effect on the basis of proportional control to eliminate static bias: integral output=(deviation x time)/integral time - integral: 0.00-99.99 minutes (SI units), the shorter the time, the stronger the integral effect

-It is necessary to avoid high-precision control of system oscillation caused by excessive integration, such as the temperature of chemical reaction vessels and food baking furnaces

Proportional integral differential control (PID) increases differential action and suppresses overshoot: differential output=differential time × deviation change rate, adjust output in advance to deal with rapid deviation - Derivativa (differential time): 0.00-9.99 minutes (SI units), the longer the time, the stronger the differential action

-Need to cooperate with "Banda muerta" (dead zone) to avoid high-frequency fluctuations, high-precision, and large hysteresis systems, such as plastic extruder temperature and semiconductor wafer heat treatment

(2) Advanced control functions

Advanced models support extended functions such as cascade control, proportional control, valve positioning control, etc., suitable for complex industrial scenarios:

Functional Type Core Logic Configuration Steps Applicable Scenarios

Cascada dual loop linkage: The output of the external loop (such as process temperature) serves as the set point for the internal loop (such as heat source temperature), and the internal loop controls the heat source to reduce hysteresis and overshoot of the external loop. 1. Configure the external loop: "P á gina Configuraci ó n>Entrada anal ó gica 3" is set to "Cascada", and "Margen bajo/alto" (internal loop range) is set