Novus N480, Руководство по эксплуатации, Страница: 6 / 8

N480
6
4. RAMP TO SOAK FUNCTION CHARACTERISTICS
This function makes the process temperature rise gradually from the starting point (present PV) to the temperature value
set in “
SP
SP SP
SP
“ (Ramp).
The user defines the rate of rise in degrees per minute at the “ rAtE rAtE rAtE rAtE ” prompt.
When SP is reached the temperature is leveled at this point for 1 to 9999 minutes as programmed at the “
t SP
t SP t SP
t SP
” prompt.
Setting 0 (zero) at “
t SP
t SP t SP
t SP
” defines an infinite length soak profile.
To disable the ramp function Set 0.0 at the “ rAtE rAtE rAtE rAtE ” prompt. To disable the soak function set 1 at the “ t SP t SP t SP t SP ” prompt (thus
making a 1 minute soak) and the control output will go off in 1 minute. To restart control set 1 at the “
rvn
rvn rvn
rvn
” prompt.
After a power failure the controller will resume ramp to soak execution at the equivalent previous ramp point. If the proces
temperature is the same as the SP (no temperature drop) the controller will repeat the soak segment.
Soak Temperature
PV
Ramp
Time
SP
Figure 2 - Ramp to Soak Function
5. PROBLEMS WITH THE CONTROLLER
Connection and configuration errors state for most of the problems in using the controller. A final revision of parameters will
save time and further losses.
Error messages are displayed to help the user to identify possible problems.
: Process temperature is below the selected sensor range.
: Process temperature is above the selected sensor range
: Controller or sensor error. Example:
•
Broken thermocouple or Pt100.
•
Pt100 badly connected, short-circuited or high cable resistance.
5.1 ELECTRONIC SERIAL NUMBER VISUALIZATION
To read the 8-digit serial number go to the Operation Level and press the key for 3 seconds. The display will show the
first 4 digits. Keep the
key pressed for 3 seconds and the display will show the last 4 digits.
FIRST 4 DIGITS
SERIAL NUMBER
LAST 4 DIGITS
When powering the unit the display will show the software version for a few seconds.
6. ALARM FUNCTIONS
Low and high alarms are used to signal minimum and maximum temperature values as programmed in the “ SPA1 SPA1 SPA1 SPA1 ” ande
“
SPA2
SPA2 SPA2
SPA2
” prompts.
Differential alarms are used to indicate deviations from the desired setpoint ( SP ) temperature. These deviations are
programmed at the “
SPA1
SPA1 SPA1
SPA1
” and “
SPA2
SPA2 SPA2
SPA2
” prompts.
Error alarm shows sensor defects or not properly connected.
Alarm hysteresis is fixed and factory set as described below:
•
Pt100: 1.1ºC
•
Thermocouples: type J: 1.3ºC; types K and S: 2.3ºC
Table 2 shows each alarm function operation with their respective code. Alarm 1 is used as an example.
TYPE CODE ACTION
LOW
0
SPA1
Alarm ON
TEMPERATURE
HIGH
1
SPA1
Alarm ON
TEMPERATURE
LOW
differenti
al
2
SPA1
Negati
ve
SP + SPA1 SP
Alarm ON TEMPERATURE
SPA1
Positi
ve
SP + SPA1 SP
Alarm
ON
TEMPERATURE