E l e c t r o n i c T e m p e r a t u r e M o n i t o r
1 8
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PPENDIX
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A –––– M
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ANUAL
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ETPOINT
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DJUSTMENT
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Although the preferred method of changing the unit setup is to use a computer connected to the RS-
232 port, there may be cases where it is desired to change a setpoint in the field when there is no
computer available. The model 111L/111W has this capability by using the following procedure:
•
Push and hold the MAX MEMORY RESET button for 5 seconds. The unit
will stop scrolling. The #1 icon will be on and the display will show the Fan
1 setpoint. (This will also reset the Max Memory)
•
Use the TEST and MAX MEMORY RESET buttons to step the Fan 1
setpoint up or down.
•
Push the MAN / FAN button. The #2 icon will be on and the display will
show the Fan 2 setpoint.
•
Use the TEST and MAX MEMORY RESET buttons to step the Fan 2
setpoint up or down.
•
Push the MAN / FAN button. The #3 icon will be on and the display will
show the Alarm setpoint.
•
Use the TEST and MAX MEMORY RESET buttons to step the Alarm
setpoint up or down.
•
Push the MAN / FAN button. The #4 icon will be on and the display will
show the Trip setpoint.
•
Use the TEST and MAX MEMORY RESET buttons to step the Trip setpoint
up or down.
•
Push the MAN / FAN button. The display will show the mA loop type – 0nA
for 0 to 1 mA, 4nA for 4 to 20 mA. Push the TEST or MAX MEMORY
RESET buttons to change type of mA loop.
•
Push the MAN / FAN button. The display will show whether the Fan Bank
switching function is On (bSy) or Off (bSn). Push the TEST or MAX
MEMORY RESET buttons to change between bank switching On and Off.
•
Push the MAN / FAN button. The display will show whether the Fan
Exerciser is On (Fey) or Off (Fen). Push the TEST or MAX MEMORY
RESET buttons to change between Fan Exerciser On and Off.
•
Push the MANUAL FAN button. The new settings are saved and the unit
returns to normal operation.
If during the above process no button is pushed within 30 seconds, the unit
returns to normal operation.
When the setpoint is changed using the above technique the switching
differential is preserved. Thus, if the original fan setpoint is 190°C with a 10°C
switching differential, the fans would come on at 190°C and turn off at 180°C.
If the above method is used to change the setpoint to 175°C, then the fans will
turn on at 175°C and off at 165°C.