2.
SEQUENCE OF OPERATION:
The sequence of
operation is based on a five (5) minute or ten (10)
minute NEMA Cycle. For either cycle length, one-
half of the total time is for adsorption of moisture
from the process gas and one-half is for desiccant
regeneration. Specifics of the timing sequence are
detailed in Figure 2, the Sequence of Operation
Diagram (SDG-2). If power is interrupted and then
reapplied, the DMP controller will start the timing at
zero. At all times during operation, the current status
of the timing cycle is indicated graphically by the
LEDs.
MODE OF OPERATION
1.
START UP:
The Digital Microprocessor Sequence
Controller will start to operate as soon as the unit is
turned on. The load outputs will recycle on and off
based on a five (5) minute or ten (10) minute NEMA
Cycle. The sequence will proceed according to the
Sequence of Operation Diagram SDG-2. See Figure
2. The timing starts at zero.
2.
NEMA CYCLE:
The DMP Controller can be set to
operate in a 5 minute NEMA Cycle or a 10 minute
NEMA Cycle. The cycle can be selected via a slide
switch at the back of the timer.
3.
FEATURES
• LED sequence annunciator indicating R/L tower
drying/regenerating, demand cycle indicator
(opt.), high humidity alarm (opt.), fail to shift
alarm (opt.).
3.
RELAY OUTPUTS (DRY CONTACTS):
There are
two relay outputs for remote annunciation. The
output is normally open rated for 10 AMPS resistive
at 125VAC, 5 AMPS resistive at 30VDC. The
outputs are for the inhibit Failure to Switch and High
Humidity. If one or both inhibits are made, the relays
will be energized and the LED on the timer will light
up.
• 5 or 10 minute NEMA cycle selector
• Alarm reset button
9
FIGURE 2 — SDG-2: 10 MINUTE SEQUENCE OF OPERATION DIAGRAM
