SPX Hankinson HHE Series Instruction Manual page 27

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 half-cycle
2: Check for fault condition just
before the end of the half-cycle
a: Blink the following LEDs: Alarm + P1 + Left tower drying
b: Blink the following LEDs: Alarm + P1 + Left tower regenerating
c: Blink the following LEDs: Alarm + P1
d: Blink the following LEDs: Alarm + P2 + Right tower drying
e: Blink the following LEDs: Alarm + P2 + Right tower regenerating
f: Blink the following LEDs: Alarm + P2
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 for < 5
closed closed
sec. then open
Stop cycle on
fault
If the fault condition is clear for 2 cycles: the alarm LED stays on (without blinking); the tower and pressure switch LEDs stop
no blinking (return to normal operation). Once the fault condition is clear, pressing the reset button will clear the alarm LED (and the
tower and pressure switch LEDs if they are still blinking).
If the fault condition clears: resume cycling; the alarm LED stays on (without blinking); the pressure switch LED stops blinking
yes
(returns to normal operation). Once the fault condition is clear, pressing the reset button will clear the alarm LED.
Event Sequence and Component Status – Level 1 Controller
Time (refer to Table 7-3)
t3 t4
(open)
Normal status of pressure switches
closed closed closed
open at t3,
closed
closed before t4
Pressure switch status that causes an alarm
open open
1 1
closed
1
open
2
Comments
Table 7-4
— 25 —
t5 t6 t7
Right Tower Drying
Left Tower Regenerating
Half Cycle
Pilot Energized
(open)
Pilot Energized (closed)
closed for < 5
closed
sec. then open
closed closed
closed
1
open
1
t8
open at t7,
closed before t8
closed
open
2
open
1