Watlow EZ-ZONE PM Express - Manual (Page 17)

EZ-ZONE PM Express (PID) • 17 • Keys and Displays
Responding to a Displayed Message
Keys & Displays for 1/8 th
or 1/4 DIN PID Controllers
®
PM8
®
PM9
®
PM4
An active message will cause the display to toggle
between the normal settings and the active mes-
sage in the upper or left display and [Attn] in the
lower or right display. Your response will depend
on the message and the controller settings. Some
messages, such as Tuning, indicate that a process
is underway. If a message is generated in the
right or lower display that can be cleared (such
as [AL;h1]), simply push the infinity ˆ key to
execute the action ([CLr]).
[AL;L1]
Alarm Low 1 (sensor input below low
alarm set point)
[AL;h1] Alarm High 1 (sensor input above high
alarm set point)
[AL;E1]
Alarm Error 1 (alarm state cannot be
determined due to lack of sensor input)
[Er;i1]
Error Input 1 (sensor is not providing a
valid signal to the control)
[tUn1]
Tuning (controller is autotuning the
control loop)
[`rP1]
Ramping (controller is ramping to a
new set point)