PMT200B SERIES DryLine
®
DEHYDRATOR USER MANUAL
5
During the initial pressurization of the
transmission line, the dehydrator will cycle
every 2 to 4 minutes with the system at 0 psig
pressure. As the dehydrator pressurizes the
system, the cycle times will increase and the
pressure will rise until the dehydrator output is
balanced with the system leak, at which point
the cycle times will stabilize.
The PMT200B offers Low Pressure and Excess
Run alarms as a standard feature; a summary
alarm connection is provided on all units. Alarm
conditions are indicated on the display. The
alarms are Form C dry contacts and have
connection options for normally open (NO) or
normally closed (NC) configurations.
Additionally, a discrete alarm option is available
with discrete connection for Low Pressure,
Excess Run, High Humidity and Power Fail
alarms. The discrete alarm version also
includes a summary alarm contact.
The external alarm monitoring system (supplied
by others) is connected to the terminal
strip located on top of the cabinet. A small
slotted screwdriver is necessary to make the
connections.
The connections to the alarm strip are as
follows; refer to Figure 1 for correct locations
and colors of the wires on the terminal strip
Alarm Definitions:
Summary:
Activates when the Excess Run, and/
or Low Pressure alarms are triggered.
It will also report High Humidity if unit
is equipped with full alarms. The
summary alarm does not report Power
Fail.
Power Fail:
Activates when power is removed from
the dehydrator. This includes turning
the power off at the switch.
High Humidity:
Activates when system or dehydrator
output humidity rise above 7.5%
relative humidity. At initial installation,
this alarm will continue to alarm until
the system has been properly purged.
Excess Run:
Factory run time set in accordance
with the normal run time for the
dehydrator application. Selectable
times are 1, 10, 30, 120 and 240
minutes, with the 10 minute selection
used on the PMT200B as the default
setting.
Low Pressure:
If system pressure falls below the
low–pressure trigger point (6.9 kPa
(1.0 psig) on the PMT200B), the low-
pressure alarm sensor will activate
an alarm contact. This alarm is an
indication of a significant system leak
or a dehydrator failure.
Note: All of the alarms clear and reset automatically,
but can be manually reset in the display menus.
However, if the alarm condition still exists, the alarm
will return immediately after being reset.
WIRE
WIRE
ALARM
TERMINAL COLOR FUNCTION
1
WHITE
EXCESS RUN NO
2
TAN
EXCESS RUN COM
3
BLUE
EXCESS RUN NC
4
BROWN
HIGH HUMIDITY NO
5
PINK
HIGH HUMIDITY COM
6
GREEN
HIGH HUMIDITY NC
7
BLACK
POWER FAIL NO
8
VIOLET
POWER FAIL COM
9
RED
POWER FAIL NC
10
ORANGE
LOW PRESSURE NO
11
YELLOW
LOW PRESSURE COM
12
GRAY
LOW PRESSURE NC
DISCRETE Alarm
WIRE
WIRE
ALARM
TERMINAL COLOR FUNCTION
1
RED
SUMMARY NO
2
WHITE
SUMMARY COM
3
BLACK
SUMMARY NC
Summary Alarm
Figure 1 — Terminal Strip Summary
Pin 3
Pin 1
Pin 1
Pin 12
