Watlow ez-zone pm - Timer Function; Setting up the Timer Function

Watlow EZ-ZONE
®
PMI Controller • 200 • Chapter 9 Features
Timer Function
1. When Timer Enable ti.En is set to yes yEs and the timer is started (you dene which key
combination this is), the controller will switch from Set Point C.sp1 to Closed Loop Timer
Set Point Ct.s1. If the timer is interrupted, the timer is terminated and the time remain-
ing is reset to its initial value.
2. When Timer Start Method ti.st is set to:
a. Immediate iЛЏd, the timer starts as soon as the counter is initiated. When Time Re-
maining t.r1 equals zero, the set point changes from Closed Loop Timer Set Point Ct.s1
back to Set Point C.SP1. A ashing colon 00:00 indicates that a countdown is in prog-
ress.
b. Ready Band rdy, the set point changes and when the temperature is within ready
band, the ready band indicator
‰
lights up and the countdown timer starts and con-
tinues as long as the temperature is within the ready band. When Time Remaining t.r1
equals zero, the set point changes from Closed Loop Timer Set Point Ct.s1 back to Set
Point C.sp1. A ashing colon 00:00 indicates that a countdown is in progress.
c. Ready Acknowledge rdya, the set point changes, and when the temperature is within
the ready band, the ready band indicator
‰
lights up. The user must then acknowledge
(you dene which key combination for this) that the countdown timer should start and
continue as long as the temperature is within the ready band. When Time Remaining
t.r1 equals zero, the set point changes from Closed Loop Timer Set Point Ct.s1 back to
Set Point C.sp1. A ashing colon 00:00 indicates that a countdown is in progress.
d. Power PФІr, the timer starts when the controller is turned on. When Time Remaining
t.r1 equals zero, the set point changes from Closed Loop Timer Set Point Ct.s1 back to
Set Point C.sp1. A ashing colon 00:00 indicates that a countdown is in progress.
3. In Setup Page, Output Menu, Output Function fn can be assigned as Timer Event Output
1 tE.o1, Timer Event Output 2 tE.o2 or Timer Event Output 3 tE.o3. Timer Event Output
1 is active during timing, Timer Event Output 2 is deactivated during timing and Timer
Event Output 3 produces a pulse at the end of the timing sequence. These signals may be
used to monitor timer activity. Process outputs may not be assigned to Timer Event Out-
puts.
4. The home display is customized in the Factory Page, Custom Menu. You may program the
display to alternate between display pairs. See display pairs in the Setup Page, Global
Menu. As an example, we could show the process temperature in the upper display and
have the lower display alternate between the countdown time remaining and the active
set point.
Note:
The timer feature is only available for control loop 1 of two-loop controllers. Time is
entered in hours, minutes and seconds. Countdown time will use the entered time but
display the time remaining in either hh:mm or mm:ss format, based on your settings. The
colon pulses in one-second intervals during a countdown, to indicate that timing is under-
way. Parameters that appear in the Home page have the number 1 at the end of the dis-
played parameter. As an example, hoUr in the Setup Page, Timer Menu will be displayed
as hoU1 in the Home Page.
Setting up the timer function
1. Press and hold up ¿ and down ¯ arrow keys for 6 seconds to enter into the Setup Page
SEt.