SPX Hankinson HHE Series Instruction Manual page 43

Process valve name
(Process valve state
w/ de-energized
pilot solenoid valve)
Left purge valve
(normally closed)
Left inlet valve (normally open)
(See NOTE 1)
Right inlet valve (normally open)
(See NOTE 1)
Right purge valve
(normally closed)
Left tower
pressure switch
Right tower
pressure switch
Left tower drying
Low tower pressure
a
Left tower regenerating
Fail to de-pressurize
b
Left tower regenerating
Fail to re-pressurize
c
Right tower drying
Low tower pressure
d
Right tower regenerating
Fail to de-pressurize
e
Right tower regenerating
Fail to re-pressurize
f
NOTE
1: Check for fault condition at 15, 25,
35,... seconds into the half-cycle
2: Check for fault condition just before
the end of the half-cycle
a: Blink the Alarm LED and display the following text message: Alarm + Left Tower Drying + Low Pressure
b: Blink the Alarm LED and display the following text message: Alarm + Left Tower Regenerating + High Pressure
c: Blink the Alarm LED and display the following text message: Alarm + Left Tower Regenerating + Low Pressure
d: Blink the Alarm LED and display the following text message: Alarm + Right Tower Drying + Low Pressure
e: Blink the Alarm LED and display the following text message: Alarm + Right Tower Regenerating + High Pressure
f: Blink the Alarm LED and display the following text message: Alarm + Right Tower Regenerating + Low Pressure
NOTE 1: Standard Pressure Models 4100 & 5400 ONLY. High Pressure Models 40 through 450 ONLY
t0 t1 t2
Left Tower Drying
Right Tower Regenerating
Half Cycle
Pilot Energized (closed)
Pilot Energized
closed closed
closed closed
sec. then open
Stop cycle on
fault
If the fault condition is clear for 1 cycle: the alarm LED stays on (without blinking) and the alarm message continues to be
no
displayed. Once the fault condition is clear, pressing the reset button will clear the alarm LED and message.
If the fault condition clears: tower cycling resumes and the alarm LED stays on (without blinking). Once the fault condition is
yes
clear, pressing the reset button will clear the alarm LED and message.
Event Sequence and Component Status – Level 2 Controller
Time (refer to Table 8-3)
t3 t4
(open)
Normal status of pressure switches
closed closed
closed for < 5 open at t3,
closed before t4
Pressure switch status that causes an alarm
open open
1 1
closed
1
open
2
Comments
Table 8-4
— 41 —
t5 t6
Right Tower Drying
Left Tower Regenerating
Half Cycle
Pilot Energized
(open)
Pilot Energized (closed)
closed for < 5
closed closed
sec. then open
closed closed closed
closed
open
t7 t8
open at t7,
closed before t8
closed
1
open
2
open
1 1