10
Z0X-2 Series Z-tron III
TM
Point Level Control
3.3 Time Delay Action
Time delay action describes whether the relay contacts are
delayed from going into the alarm state or recovering from an
alarm state.
•
FWD:
Forward delays the system from coming OUT of
alarm.
•
REV:
Reverse delays the system from going INTO
alarm.
• The instrument is supplied with the time delay action
set in the forward mode position.
• The time delay action may be selected in the field using
the slide switch #2 located on the top of the instrument.
See Figure 3-1.
Selecting Time Delay with Slide Switch #2:
Forward Acting
- Switch #2 is ON, or to the RIGHT.
Reverse Acting
- Switch #2 is OFF, or to the LEFT.
3.4 Failsafe
Failsafe describes the level condition which causes the
output relay to de-energize, and determines the condition
of the relay upon loss of power or upon the failure of most
components.
• The failsafe mode may be selected in the field by
changing the position of slide switch #1 located on the
top of the instrument. See Figure 3-1.
• High Level Failsafe (HLFS) means the relay will de-
energize when level is high, indicating high level upon
loss of power. (N.O. contacts open/N.C. contacts closed)
• Low Level Failsafe (LLFS) means the relay will de-
energize when level is low, indicating low level upon loss
of power. (N.O. contacts open/N.C. contacts closed)
• The instrument is supplied in the failsafe mode that is
requested when the order is placed. If none specified, it
will be shipped as High Level Failsafe (HLFS).
Selecting Failsafe with Slide Switch #1:
High Level Failsafe (HLFS)
- Switch #1 is ON, or to the
RIGHT.
Low Level Failsafe (LLFS)
- Switch #1 is OFF, or to the
LEFT.
3.5 Start-up
Before applying power to the instrument, be sure that the
power wiring is correct.
See Section 2.3.
