Owner manual

- 38- Revision 4.6 3/2004
change of state has been detected. When the switch has
tripped the HHC will display:
Eng Unit Tripped
+12345 +vvvvv
where:
• Eng Unit is the pressure or temperature engineering
unit in use
• Tripped indicates the pressure switch has tripped
• +12345 represents the pressure or temperature at
which the switch tripped
• +vvvvv is voltage value
Step 5 To perform additional trip tests press any key
and the trip detect system will be rearmed.
Step 6 To discontinue the switch testing process press
the trip detect key.
TRIP
DET
The HHC will respond by displaying:
Disable Manual
Deadband
Step 7 Using the left/right and up/down arrow keys
select the word disable in the menu selection. When
selected the word disable will flash.
Disable Manual
Deadband
Step 8 With the word “disable” flashing press the
enter key.
ENT
The switch test operation has now been terminated.
Section 18.3 Switch Deadband Testing
Step 1 With the HHC on and reading pressure or tem-
perature press the trip detect key on the keypad.
TRIP
DET
The HHC will respond by displaying the following:
Disable Manual
Deadband
Step 2 Using the left/right and up/down arrow keys
select the word deadband in the menu selection. When
selected the word deadband will flash.
Disable Manual
Deadband
Step 3 With the word “Deadband” flashing press the
enter key.
ENT
Step 4 Gradually increase or decrease, as required,
pressure, vacuum or temperature until the display of the
HHC indicates that a change of state has been detected.
When the switch has tripped the HHC will display:
Eng Unit Tripped
+12345 +vvvvv
where:
• Eng Unit is the pressure or temperature engineering
unit in use
• Tripped indicates the pressure or temperature switch
has tripped
• +12345 pressure at which the switch tripped
• +vvvvv is voltage value
Step 5 To perform a deadband test, maintain the pressure/
vacuum or temperature and power applied to the switch
and press any key to rearm the trip detection system.
TRIP
DET
Step 6 Gradually allow the pressure/vacuum or temper-
ature level applied to the switch to return to the starting
point.
Step 7 When the HHC detects a reset of the switch the
HHC will respond by displaying:
Deadband +xxxxxxx
+yyyyyyy +zzzzzz
where:
xxxxxx is the measured trip point
zzzzzz is the measured reset point
yyyyyy is the measured deadband value
Step 8 To perform additional deadband tests press any
key and the trip detect system will be rearmed.
Step 9 To discontinue switch testing press the trip
detect key.
TRIP
DET
The HHC will respond by displaying:
Disable Manual
Deadband
Step 10 Using the left/right and up/down arrow keys
select the word disable in the menu selection. When
selected the word disable will flash.