1/01 UDC3300 Limit Controller Product Manual 51
5.4 How to Operate Your Limit Controller, Continued
Selecting a setpoint
value
Use the procedure in Table 5-5 to change the setpoint value in the lower
display.
Table 5-5 Change a Setpoint Value Procedure
Step Press Action
1
LOWER
DISPLAY
until you have selected display mode #1 or #2.
2
or
This changes the value of the limit controller setpoint.
NOTE: To change setpoint values quickly, you can adjust
a more significant digit in the lower display by holding in
one key [s] or [t] and pressing the other [s] or [t] at the
same time. The adjustment will move one digit to the left.
Press the key again and you will move another digit to the
left.
High or low limit
indication
When the High or Low limit setpoint is exceeded the lower display
alternately indicates “the limit control setpoint value” and the word
“LIMIT.” This will continue until you reset the latching relay.
Non-latching relay
alarm conditions
The alarm is active if alarm setpoint 1 or alarm setpoint 2 is exceeded. The
alarm goes inactive when the value goes into the allowed region by more
than the hysteresis.
Digital input option
The digital input option detects the state of external contacts. On contact
closure, the limit controller will be reset if the option has been enabled at
prompt “EXT RSET” in Set Up group “Limit.” (See Sections 3 and 4 for
explanation.)
How to reset the
latching relay
The latching relay cannot be reset until the PV input signal drops below
the high limit setpoint or rises above the low limit setpoint.
Press the [RESET] key or make contact closure of an external switch if the
digital input option is present.
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