long cycle time is selected for a fast process, the process may become unstable as a result. Theoretically, the smaller
the cycle time selected, the better the control that can be achieved. However, for a relay output, the cycle time should be
as large as possible (while maintaining satisfactory control) in order to maximize the life of the relay.
The following table provides cycle time recommendations for avoiding premature relay failure:
Note: In an on-off control (when PB is set to zero) the cycle time parameter may be ignored.
FAIL-SAFE Configuration
FAIL-SAFE is a tool program used to define as on or off the status of output 1 (OUT1), output 2 (OUT2), alarm 1 output
(ALM1), and alarm 2 output (ALM2) in the event of a failure. Press and release and repeatedly until FAIL-SAFE
appears in the display windows. Press the scroll key until the desired output is shown in the upper display. Now press
and hold the up or down key to change the status as shown in the lower display. Note that if the desired setting is
different from the original one, a long scroll (pressing the scroll key for 3.2 seconds) will be required to enter the new
value before proceeding to the next tool parameter. If the FAIL-SAFE status is not critical for a process if the controller
should fail, then this section can be ignored.
LOCK Parameter
The flow chart in section 5–4 shows how to reach LOCK PARA and from there reach LEVEL (LEV.0–LEV.2), which is
shown in the upper display, and the lock status of that level (LOCK or FREE), which is shown in the lower display. For
example, if you select LOCK for LEV.2 and press the scroll key for 3.2 seconds to enter the selection, the all parameters
in level 2 can no longer be changed. A LOCK message will appear in the upper display if someone attempts to change a
locked parameter.
Configuring Security Levels of Parameters
One of the features of this controller is the ability to assign the security level for each parameter individually. One of four
levels (level 0, level 1, level 2, or level 3) can be assigned to any parameter. The parameters with lower security levels
will be displayed before parameters with higher security levels as one cycles through the parameters using the scroll
key. Furthermore, level 3 parameters are not displayed on the front panel, so any unused parameters can be assigned
security level 3 and removed from the viewing rotation completely.
As shown in section 5.4, to configure a new level for a parameter, press and to reach CONF LEVL, then press
to display the desired parameter. The lower display will indicate the level of the selected parameter. You can now
change the level for that parameter using the up and down keys. Finally, press and hold for 3.2 seconds or longer to
enter the new value. For example, if ASP1 and RAMP are set as level 0, PB, TI, and TD are set as level 1, ASP2 is set
at level 2, and all other parameters are set as level 3, the scrolling sequence of parameters will be as follows:
Output Device
(OUT1 or Cooling Output)
Cycle Time
(CYC or CCYC)
Load (resistive)
Relay
20 sec. or more
recommended
10 sec. minimum
2A/250VAC
or contactor
5 sec. minimum
1A/250VAC
Solid State Relay Drive
1–3 sec.
SSR
Linear Current/Voltage
0.1 sec.
Phase control module
15
ASP1
RAMP
TI
TD
SV
PB
ASP2
