Connections – High Humidity Or Dew Point Alarm; Jumper Jp3 – Outlet Dew Point Sensor; Jumper Jp4 – Inlet Pressure Sensor; Jumper Jp1 – Maximum Operating Pressure - Gardner Denver DGH Series Instruction Manual

7. Controller – Level 2
the same response as a loss of power. Both inlet-
switching valves will open and both purge-
repressurization valves will close. A tower that is
actively purging when the power on/off button is
actuated will be subjected to a rapid repressurization
that can lead to fluidization and subsequent abrasion
of the desiccant bed. Ideally, dryers should only be
powered off during those portions of the drying cycle
when both desiccant towers are at full operating
pressure. Use of the remote start/stop connections as
described in Section 7.2.3 would be preferable in most
cases.
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Terminals J2-7 and –8 (Remote Alarm Reset Switch)
7.2.5 Connections – RS232 / Net Web
RS232 and/or Net Web connections can be made at the 3-pin
connector labeled J3 and located at the upper left-hand corner
of the control board.
7.2.6 Connections – High humidity or dew point alarm
The normally closed dry contacts from a high humidity or dew
point alarm device can be wired to AUX 1 terminals TB1-7 and
TB1-8. A shorting jumper that connects the two terminals must
be installed if an alarm device is not wired to the terminals.
When continuity between the terminals is broken, the controller
displays an outlet dew point alarm (refer to Section 7.9, screens
17 and 18). If the AUX1 terminals are in use, then the optional
dew point sensor cannot be used (see 7.3.3).
7.3 Control Board Jumpers – Level 2
Refer to Figure 7-3, Point to Point Connection Diagram – Level 2
Controller. In the upper left hand corner of the control board
there are eight two-pin jumpers labeled JP1 through JP8. Only
five of the eight jumper pairs are utilized. Pairs JP6-JP8 are not
used. NOTE: Do not install jumpers in the ON position on
pairs JP6 through JP8. The jumper is a removable bridge that
is used to make or break continuity between the two pins that
form a pair. When installed in the ON position, the jumper is
placed on both pins of the pair and continuity between the pins is
established. When installed in the OFF position, the jumper is
removed or stored on a single pin and continuity is broken.
Jumper functions are as follows:
7.3.1 Jumper JP1 – Maximum Operating Pressure
•
Jumper JP1 is used to select the maximum operating
pressure. Installed in the OFF position when operating at
inlet pressures of 60 to 150 psig (4.2 to 10.5 kgf/cm
Installed in the ON position when operating at inlet
pressures of 120 to 250 psig (8.4 to 17.6 kgf/cm
•
This setting will affect tower purge and repressurization
times.
7.3.2 Jumper JP2 – Electric Drains
•
Jumper JP2 is installed in the ON position if one or two
electric demand drains are installed. It is installed in the
OFF position when no electric drains are installed.
7. Controller – Level 2
•
The drains can be manually tested through the Level 2
controller Setup Mode.
•
The drains provide a digital alarm signal to the Level 2
controller, which then displays an alarm message.
•
If the dryer has only 1 drain, then the alarm input terminals
for Drain 2 (TB2-25 and TB2-26) must be shorted.
7.3.3 Jumper JP3 – Outlet Dew Point Sensor
•
When a dew point sensor is connected to Analog Input 1,
AUX 2 terminals (TB1-5 and TB1-6), Jumper JP3 should
be installed in the ON position. The jumper is stored in the
OFF position when no device is installed.
•
The Level 2 Controller will display the dew point in °C and
°F. The instrument's range is -130°F to +50°F (-90°C to
+10°C). The user will set an alarm point through the Level
2 Controller Program Mode. When the measured dew
point exceeds the alarm point, a high dew point alarm
occurs, which is then displayed on the Level 2 Controller.
•
If the dew point sensor is installed, the AUX1 terminals
must be shorted (see 7.2.6).
7.3.4 Jumper JP4 – Inlet Pressure Sensor
•
When a pressure sensor is connected to Analog Input 2,
AUX 3 terminals (TB1-3 and TB1-4), Jumper JP4 should
be installed in the ON position. The jumper is stored in the
OFF position when no device is installed.
•
The Level 2 Controller will display the pressure in bar(g)
and psig. The instruments range is 0 to 250 psig (0 to 17
bar(g)).
•
There are no alarms associated with the pressure sensor.
7.3.5 Jumper JP5 – Inlet Temperature Sensor
•
When a temperature sensor is connected to Analog Input
3, AUX 4 terminals (TB1-1 and TB1-2), Jumper JP5 should
be installed in the ON position. The jumper is stored in the
OFF position when no device is installed.
•
The Level 2 Controller will display the inlet temperature in
°C and °F. The instrument's range is +40°F to +150°F
(+4°C to +66°C).
•
There are no alarms associated with the temperature
sensor.
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