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4-18 l Operation
Control Function Descriptions (continued)
Test Mode
Screens *
SCREEN 50
SCREEN 52
SCREEN 53
Function
This is the output 3 screen. Press the "+"
key to jog output 3. Output 3 on a heater
is the process heater solid-state relay sig-
nal. Pressing the "+" key will cause the
process solid-state relays to fire. You can
observe the solid-state relay LED to check
this output. Since the isolation contactor is
open, the heater does not come on because
it does not have power.
This is the output 5 screen. Press the "+"
key to jog output 5. Output 5 on a heater
is the process heater power isolation con-
tactor signal. Pressing the "+" key will
cause the isolation contactor to close.
Watch the isolation contactor pull in to
check this output. Since the solid-state
relays are not on, the heaters does not
come on because they do not have power.
This is the output 6 screen. Press the "+"
key to jog output 6. Output 6 on a heater
is the alarm horn. Pressing the "+" key
will cause the alarm horn to sound.
ou.3
OFF
ou.6
OFF
ou.5
OFF
* Outputs 1, 2, and 4 are not used
in the HTC.