Event Sequence And Component Status – Level 2 Controller - Gardner Denver DGH Series Instruction Manual

7. Controller – Level 2
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 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
7. Controller – Level 2
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 1 cycle: the alarm LED stays on (without blinking) and the alarm message continues to
no
be 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
yes
condition is clear, pressing the reset button will clear the alarm LED and message.
Event Sequence and Component Status – Level 2 Controller
Time (refer to Table 7-4)
t3 t4
(open)
closed closed closed
open at t3,
closed
closed before t4
1 1
open open
1
closed
2
open
Comments
Table 7-5
- 38 –
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
t8
open at t7,
closed before t8
closed
2
open
1
open