Ametek Z-tron IV, Инструкция по установке и эксплуатации

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Operation
15
3.2 Time Delay Control
The time delay adjustment is located on top of the
instrument, as shown in Figure 3-1. It is used to help stop a
repeated relay output due to agitation or waves in the vessel.
CAUTION:
THIS adjustment is a 270º (¾ turn) potentiometer. Do
not turn it beyond its mechanical stops or damage to
unit may occur.
The unit is shipped with the Time Delay set to zero (0)
seconds. Using a small screwdriver, turn the adjustment
clockwise to set anywhere from 0 to 60 seconds.
If the unit is waiting for a change in its alarm state, the
alarm LED is blinking and the blinking period is equal to one
second. One second period helps to accurately adjust time
delay potentiometer to desirable value without necessity of
using a stopwatch.
When the alarm LED is blinking, it uses one of two possible
blinking modes. See Time Delay Action for definition of
modes.
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 acting delays the system from coming
OUT of alarm. Long blinking mode, 0.9 second on and
0.1 second off.
•
REV:
Reverse acting delays the system from going
INTO alarm. Short blinking mode, 0.1 second on and 0.9
second off
• 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 left slide switch located on the top of the instrument.
See Figure 3-1.
Selecting Time Delay with Slide Switch:
Forward Acting
- Left Switch UP.
Reverse Acting
- Left Switch Down.