![background image](http://html1.mh-extra.com/html/gardner-denver/deb-series/deb-series_instruction-manual_3579620013.webp)
13
Input Which Causes
Cycle Steps When Alarm
Alarm
Alarm
Tower
the Alarm
May Be Activated
Number
Description
Operating
(See Figure 4.6)
(See Figures 4.7 & 4.8)
Mode
Number
Status
Fixed
Demand
Cycle
Cycle
L1
Low Tower Pressure
I0.0
Off
00-15
00-15
R1
Drying
I0.1
L2
Early dew point
I0.6
On
NA
08
R2
breakthrough
L3
Failure to
I0.0
On
03, 05-08,
03, 05-09,
R3
Depressurize
I0.1
13
13
L4
Low or no Blower Pressure
I0.2
Off
07,08
07-09
R4
L5
High Heater Element
Regeneration
I0.3
On
06-08
06-09
R5
Temperature
L6
Incomplete Heating
I0.4
Off
14
14
R6
I0.5
L7
Failure to
I0.0
Off
15
15
R7
Repressurize
I0.1
L8
High Outlet Dew Point
Analog input
Dew point
08-15
08-15
Drying
from dew point
exceeds user
R8
monitor
spec'd set point
6 Hour Cycle (3 Hour Drying Per Tower)
Fixed Cycle Step Length (Minutes)
Step
One Stage Regeneration
Two Stage Regeneration
Step
Number
(Standard)
(Optional)
Description
L00, R00
0.5
0.5
Open inlet valve to on-line tower
L01, R01
0.5
0.5
Close inlet valve to off-line tower
L02, R02
4.0
4.0
Depressurize off-line tower
L03, R03
0.5
0.5
Examine off-line tower pressure switch
L04, R04
0.5
0.5
Open purge valve
L05, R05
0.5
0.5
Examine off-line tower pressure switch
L06, R06
0.5
0.5
1st stage regeneration
L07, R07
50.0
50.0
1st stage regeneration (continued)
L08, R08
115.5
80.0
1st stage regeneration (continued)
L09, R09
0.5
0.5
1st stage regeneration extended for demand cycle
L10, R10
N/A
1.0
Partially pressurize off-line tower to seat purge check valve
L11, R11
N/A
2.0
Depressurize off-line tower
L12, R12
N/A
0.5
Open purge valve
L13, R13
N/A
32.0
2nd stage regeneration
L14, R14
6.5
6.5
Repressurize off-line tower
L15, R15
0.5
0.5
Examine off-line tower pressure switch
Total
180.0
180.0
Drying time per tower
Figure 4.10 - Alarms
If the dryer has one stage regeneration (standard), steps 10 through 13 are skipped.
Under DEMAND cycle operation, steps L09, R09, L15, and R15 are variable length. The minimum time is shown above for these steps and for the drying time per tower.
Figure 4.9 - Operating Schedule: Cycle Times