SPX Hankinson HHE Series Instruction Manual page 34

the drying cycle when both desiccant towers are at full operating
pressure. Use of the remote start/stop connections as described
in Section 8.2.3 would be preferable in most cases.
• Terminals J2-7 and –8 (Remote Alarm Reset Switch)
8.2.5 Connections – RS232
Refer to Figure 8-4, Panel Layouts – Level 2 Controller. RS232
connections can be made at the 3-pin connector labeled J3 and
located at the upper left-hand corner of the control board. A cable for
this connection can be purchased through your distributor.
8.2.6 Connections – High humidity alarm
The normally closed dry contacts from a high humidity 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 8.9, screens 17 and 18).
8.3 Control Board Jumpers – Level 2
Refer to Figure 8-3, 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 three of the eight
jumper pairs are utilized. Pairs JP3-JP5 and JP7-JP8 are not used.
NOTE: Do not install jumpers in the ON position on pairs JP3 through
JP5 or JP7 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:
8.3.1 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 (4.1 to 10.3 barg). Installed in the ON position
when operating at inlet pressures of 120 to 250 psig (8.3 to
17.2 barg).
• This setting will affect tower purge and repressurization times.
8.3.2 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.
• 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.
8.3.3 Jumpers JP3 through JP5 – Unused.
8.3.4 Jumper JP6 – Common Alarm.
Jumper JP6 is installed in the OFF position to enable both dryer fault
alarms and service alarms to activate the common alarm. This is
the default configuration. Install jumper JP6 in the ON position if the
common alarm is to be activated by a dryer fault alarm only.
8.3.5 Jumpers JP7 through JP8 – Unused.
8.4 Front Panel Overlay – Level 2 Controller
Refer to Figure 8-1, Front Panel Overlay – Level 2 Controller for
information regarding the location and function of the LEDs, switches,
and text display.
8.4.1 Front Panel LEDs
• Power on – green (constant when controller is switched on;
flashing when controller is energized but switched off.)
• Alarm – red
• Service/maintenance reminder – amber
• Filters (pre, after, and pilot) service/maintenance reminders
- amber
• Purge / repressurization valve status (On = valve open; Off = valve
closed) – green
• Left and right tower status (regenerating) - amber
• Left and right tower status (drying) - green
• Left and right tower pressure switch status (On = switch closed;
Off = switch open) – green
8.4.2 Front Panel Switches
The front panel contains four momentary-contact push button switches.
Refer to Figure 8-1, Front panel Overlay – Level 2 Controller for the
appropriate icon associated with each switch. Pushing on the overlay
icon actuates the switch. Switching can be affected remotely by wiring
external push-buttons to the RPB (J2) terminals located on the rear of
the display board. Refer to Section 8.2.4.
8.4.2.1 Dryer On / Off Switch
This switch is used to turn the dryer on (run) or off (stop).
CAUTION: In the event of a loss of power, either intentional or
unintentional, both purge-repressurization valves will close. On
standard pressure models 4100 & 5400 and high pressure models
40 through 450, both inlet-switching valves will open. A tower that
is actively purging when the power 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 be powered off at the end of any half cycle when both
desiccant towers are at full operating pressure.
Power recovery after an external loss of power is affected by the
programming of the auto restart mode (Program Mode – Screen 2).
Refer to Section 8.7 for additional information.
8.4.2.2 SELECT Switch
This button is located to the left of the text display window.
Refer to Section 8.6 for additional information.
8.4.2.3 ENTER Switch
This button is located to the right of the text display window.
Refer to Section 8.6 for additional information.
8.4.2.4 Alarm Reset Switch
This switch is normally used to reset an alarm or service reminder.
Refer to Section 8.9 for additional information.
8.5 Event Sequence and Component Status
Refer to Tables 8-2, 8-3, and 8-4 for the event sequence, timing and
component status for the Level 2 Controller.
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