Honeywell UDC2500 Manuale Utente

Lower Display 

Upper Display 

DE 2 
TC W  
TC F 

16 
17 
18 

DEVIATION FROM LSP 2 (NOTE 3) 
THERMOCOUPLE WARNING (NOTE 5) 
THERMOCOUPLE FAILING (NOTE 6) 

 

 

 

 ATTENTION   

NOTE 1. When the controller is configured 
for Three Position Step Control, alarms set 
for Output will not function. 

 

 

NOTE 2. Alarm 1 is not available if the Timer 
is enabled because Alarm 1 is dedicated to 
Timer output. 

 

 

NOTE 3. This Deviation Alarm is based upon 
deviation from the 2nd Local Setpoint or 
Remote SP regardless of whichever SP is 
active. 

 

 

NOTE 4. Loop Break monitors the control 
loop to determine if it is working. When 
enabled, the control output is checked 
against the minimum and maximum output 
limit settings. When the output reaches one 
of these limits, a timer begins. If the timer 
expires and the output has not caused the 
PV to move by a pre-determined amount, 
then the alarm activates, thus signalling that 
the loop is broken. The loop break timer 
value must be configured by the operator as 
the AxSx VAL entry.  This value is in 
seconds with a range of 0 to 3600 seconds.  
A setting of 0 is equivalent to an 
instantaneous loop break when the output 
reaches one of its limit values. 

The amount of PV Movement required is 
determined by the “UNITS” setting in the 
Display Setup Group.  For the Degrees F 
configuration, the PV must move by 3

° in the 

desired direction in the time allowed.  For the 
Degrees C configuration, the PV must move 
by 2

° in the desired direction in the time 

allowed.  For the “NONE” selection, the PV 
must move 1% of the PV range in the time 
allowed. 

Loop Break alarms do not have a 
HIGH/LOW State configuration, they are 
always assumed to be a HIGH state alarm.