Watlow Series L Temperature Limiting Controller

Setpoint locking: LF/LS setpoints cannot be modified on site, LV needs to press the SET button to adjust, to prevent unauthorized personnel from operating them incorrectly.

(2) Operation interface functions (LV series only)

The LV series offers two versions of the operating interface, adapted to different operating habits:

Rotary encoder version (Figure 12):

Display screen: 4-digit LED displays the set point, the ° F/° C indicator light displays the current unit, and the ALARM indicator light is on to trigger protection.

Operation: Press the SET/RESET button and rotate the encoder to adjust the set point. After the encoder stops for 3 seconds, it will automatically save; After triggering the protection, press the RESET button to reset (if the temperature meets the standard).

Button version (Figure 13):

Buttons: UP (increase), DOWN (decrease), SET/RESET (confirm/reset). Press the SET button for 3 seconds to enter adjustment mode, UP/DOWN button to modify the set point, no operation saved for 3 seconds.

Advanced function: Press and hold the UP+DOWN button for 5 seconds to enter calibration offset (-30~30 ° C); Press and hold for 10 seconds to switch between ° F/° C units, and the set point and measured value will be automatically converted after switching.

(3) Fault diagnosis and status indication

Solution to the meaning of series fault codes/indicator lights

LV [Er; In] sensor input fault (open/short circuit). Check the sensor wiring and replace the sensor

LS two LED alternate flashing dual sensors temperature difference>20 ° C or polarity reversed check sensor polarity, adjust installation position to ensure temperature difference ≤ 20 ° C

LS Limit LED flashes, Range LED lights up, temperature does not drop to reset threshold, wait for temperature to drop below "set point hysteresis", or power off to reset

The full range of ALARM LEDs are constantly on, triggering temperature limit protection to investigate the cause of overheating (such as heating tube adhesion), and ensuring temperature safety before resetting

2. Key configuration points

(1) Set point configuration

LF series: The set point is specified by the ordering model, such as "0120" in "LFC4JW0120AAAA" indicating a set point of 120 ° F. It is necessary to ensure that the set point is within the sensor range (such as 0-750 ° C for J-type thermocouples).

LV series: on-site adjustment, the steps are as follows:

Press the SET button for 3 seconds, and the display screen will flash to enter adjustment mode.

Rotary encoder (or press UP/DOWN key) to modify the set point, the range should be within the "low limit set point - high limit set point" (customized when ordering).

Stop the operation for 3 seconds, the display screen stops flashing, and the set point is saved.

LS series: The set point and hysteresis loop are specified by the ordering model, for example, in "LSF4HW0900220AA", "0900" represents the set point of 900 ° F and "220" represents the hysteresis loop of 20 ° F, which cannot be modified on site.

(2) Temperature unit configuration

LF/LS: Unit specified by ordering model (such as J-type thermocouple with "J" in ° C and "H" in ° F), cannot be switched on site.

LV: The button version supports unit switching, steps:

Press and hold the UP+DOWN key for 10 seconds, and the display screen will show "F" and "C".

Press the UP key to switch to ° F, and press the DOWN key to switch to ° C.

No operation for 3 seconds, the unit takes effect, and the set point and measured value are automatically converted (such as 100 ° C → 212 ° F).

(3) External reset configuration (LF/LV only)

Wiring: Connect an external momentary normally open switch (such as a button) to terminal 9 (RESET) and the common terminal (COM).

Function: After triggering the protection, press the external switch (or panel RESET button), and if the temperature has dropped to the reset threshold, output a reset; If the temperature does not meet the standard, resetting will be ineffective to avoid danger relief.

Installation and wiring specifications

1. Installation process (taking panel installation and rail installation as examples)

(1) 1/8 DIN panel installation (LV series, IP65 protection)

Preparation for Drilling: Drill holes on the panel in a size of 72.4mm × 72.4mm, with smooth edges and no burrs, and a panel thickness of 1.52-3.18mm.

Sealing gasket inspection: Confirm that the rubber sealing gasket on the front of the controller is not twisted and fits snugly into the groove of the housing to ensure IP65 protection.

Embedded controller: Insert the controller from the front of the panel, with the sealing gasket completely covering the edge of the opening without any offset.

Fixed bracket: Install the bracket from the back of the panel, ensuring that the bracket buckle is aligned with the ridge of the controller housing, press the bracket tightly against the panel, and lock the buckle with your thumb (both side buckles need to be locked at the same time to avoid uneven force causing sealing failure).

Check installation: Gently shake the controller without looseness; The front of the panel has no protrusions/indentations, and the sealing gasket has no compression deformation.