Despatch LBB2-xxA/B-2 - Manual (Page 22)

T HEORY OF O PERATION LBB Series Oven Owner’s Manual
22 Version 18
Table 2. Control Instrument Explanations.
3.2.2. High Limit Instrument
The LBB Series oven is equipped with a High
Limit instrument (Figure 5). The High Limit
instrument protects the oven or product by
discontinuing the heating process when the High
Limit is exceeded.
Set the High Limit instrument to a temperature
10°C - 14°C higher than the control instrument
setpoint, or to a temperature that should not be
exceeded in the process. If the setting on the High
Limit instrument is exceeded, the heater shuts
down. See
Table 3 for explanation about the
High Limit instrument.
Table 3. High Limit Instrument Explanations.
Features
Description
OP1 Output 1 status value. (OP2 normally not used for LBB Ovens).
°
C/
°
F Degree indicator.: Celsius or Fahrenheit
PV Process value
HSP1 High Limit setpoint 1. (LSP1 typically not used for LBB Ovens).
SP2 Setpoint 2 for output 2 (typically not used for LBB Ovens)
LOCK Lock status indicator
Scroll Key, used for advancing available displays
Display Description
Main (PV) Display Typically displays actual oven temperature. Press SET/ENT to display
setpoint. Displays parameter code and value.
Key
Press to switch between PV and SP displays. Enter data using or . Press
repeatedly to switch through parameter displays.
Decrease setpoint or mode parameter
Increase setpoint or mode parameter
SP Lit when setpoint value displays
OUT Lit when control calls for heat
AL1 –2 N/A
Reset the High Limit instrument by pressing RESET on the
instrument.
Figure 5. High Limit Instrument.