26 UDC3300 Limit Controller Product Manual 1/01
3.7 Limit Set Up Group
Introduction
Limit control provides a latching output relay which is de-energized
whenever the PV goes above (high limit) or below (low limit) a selected
setpoint value. Reset is through the [RESET] key on the front of the
controller or an optional external switch (Digital Input #1).
Function prompts
Table 3-4 lists the function prompts in the “LIMIT” Set Up group.
Table 3-4 Limit Group Function Prompts
Function Prompt
Lower Display
Function
Name
Selections or
Range of Setting
Upper Display
Factory Setting
LO or HI
Type of Limit Control LO LIM
HI LIM
HI LIM
EXT RSET
External Reset
(Digital Input 1)
DISABL
ENABLE
EXoNLY
DISABL
POWER UP
Power-up Logic NORMAL
RESET
NORMAL
SP HILIM
High Setpoint Limit 0 to 100% of Span in engineering
units
ATTENTION
This value should
never be set higher than the
temperature limit of the oven or
furnace being controlled.
1000
SP LOLIM
Low Setpoint Limit 0 to 100% of Span in engineering
units
0