Event Sequence And Component Status – Level 1 Controller - Gardner Denver DGH Series Instruction Manual

Process valve name
(Process valve state
w/ de-energized
pilot solenoid valve)
Left purge valve
(normally closed)
Left inlet valve
(normally open)
Right inlet valve
(normally open)
Right purge valve
(normally closed)
Left tower
pressure switch
Right tower
pressure switch
Left tower drying
a
Low tower pressure
Left tower regenerating
b
Fail to de-pressurize
Left tower regenerating
c
Fail to re-pressurize
Right tower drying
d
Low tower pressure
Right tower regenerating
e
Fail to de-pressurize
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 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
t0 t1 t2
Left Tower Drying
Right Tower Regenerating
Half Cycle
Pilot Energized (closed)
Pilot Energized
Normal status of pressure switches
closed closed
closed for < 5
closed closed
sec. then open
Pressure switch status that causes an alarm
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
no stop 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're still blinking).
If the fault condition clears: resume cycling; the alarm LED stays on (without blinking); the pressure switch LED stops
yes blinking (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 6-3)
t3 t4
(open)
closed closed closed
open at t3,
closed
closed before t4
1 1
open open
1
closed
2
open
Comments
Table 6-4
- 21 –
6. Controller – Level 1
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
1
closed
1
open
6. Controller – Level 1
t8
open at t7,
closed before t8
closed
2
open
1
open