Watlow PM LEGACY ™ Limit controller

Lag value (L.hy): Set the process value deviation required for limit reset (0.001-9999.000 ° F/° C, default 3.0 ° F or 2.0 ° C), for example, if the high limit is 200 ℃ and the lag is 2 ℃, the process value needs to drop below 198 ℃ to reset the limit.

Reset source (sfn. a/si. a): Select the trigger source for limit reset (such as numeric input 5, Function key) and corresponding instance to ensure that the reset operation is effective.

Alarm configuration (Setup Page Arm Menu)

Alarm type (a.ty): Select "off" or "Pr.AL", process alarms support high/low alarms (set according to a.sd).

Alarm source (sr.a/is.a): Select the input source (such as analog input 1) and instance for alarm monitoring to ensure matching with the controlled object.

Alarm setting value (a.hi/a.Lo): Set the high/low alarm trigger value (-1999.000-9999.000 ° F/° C, default high alarm 300.0 ° F or 150.0 ° C, low alarm 32.0 ° F or 0.0 ° C), which needs to be set according to the process safety range.

Lock and mute (a.La/a.si): When "a.La" is set to "LAt (lock)", it needs to be manually cleared after the alarm is triggered; When "a.si" is set to "on", the alarm output can be muted through the Reset key or communication command.

Communication Configuration (Setup Page Communications Menu)

Protocol (pCoL): Select the protocol for port 1 (Standard Bus or Modbus RTU), and port 2 supports Modbus RTU, EtherNet/IP, DeviceNet, Profibus DP depending on the model.

Address and baud rate: Modbus addresses 1-247, Standard Bus addresses 1-16, DeviceNet addresses 0-63, Profibus addresses 0-126; The baud rate should be selected according to network requirements (such as Modbus RTU 9600bps, DeviceNet 250kbps), and all network devices should be consistent.

IP parameters (EtherNet/IP/Modbus TCP only): Set "iP. ∧Џ" to "dhCP (auto fetch)" or "F.Add (fixed IP)". Fixed IP requires setting ip.f1-ip.f4 (IP address), ips1-ips4 (subnet mask), and ipg1-ipg4 (gateway). After modification, the controller needs to be restarted to take effect.

（3） Calibration operation

Calibration prerequisite: It is necessary to confirm that the input/output readings exceed the accuracy range (such as a large deviation between the simulated input display value and the standard signal source). Before calibration, a standard signal source with higher accuracy than the equipment (such as a high-precision thermocouple simulator, DC power supply), a high-precision measuring instrument (such as a 4.5 bit multimeter), and the controller must be at a stable ambient temperature (25 ° C ± 3 ° C).

Analog Input Calibration (Factory Page Calibration Menu)

Input offset (ELi. o): Connect a low range standard signal (such as a thermocouple 0.000mV, current 0.000mA), read the controller display value, and if there is a deviation from the standard value, adjust "ELi. o" to make the display value equal to the standard value (range -1999.000-9999.000).

Input slope (ELi. S): Connect a high range standard signal (such as thermocouple 50.000mV, current 20.000mA), read the controller display value, and if there is a deviation from the standard value, adjust "ELi. S" to make the display value equal to the standard value (range -1999.000-9999.000). Slope calibration affects the accuracy of the entire range.

Output Calibration (Factory Page Calibration Menu)

Output offset (ELo. o): Configure the output to a low range value (such as voltage 0.0V, current 4.0mA), measure the actual output value with a multimeter, adjust "ELo. o" to make the actual value equal to the set value (range -1999.000-9999.000).

Output slope (ELo. S): Configure the output to a high range value (such as voltage 10.0V, current 20.0mA), measure the actual output value with a multimeter, adjust "ELo. S" to make the actual value equal to the set value (range -1999.000-9999.000).

Calibration precautions: Calibration parameters need to be saved to EEPROM (via "Setup Page Global Menu Usr. s") to avoid power loss; After calibration, it is necessary to verify the accuracy of multiple intermediate points to ensure that the entire range meets the requirements; Non professionals are not recommended to perform calibration operations, please contact Watlow technical support.