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2. DELCOS 3100 Base-Load Sequencing
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Setting value too high (sensitive): the BLS system
disconnects compressors prematurely in the range
between CUT-IN POINT and CUT-OUT POINT.
2.7
Progression through the BLS array
Once the changeover time has elapsed, the system
switches over to the new array, and the time remaining
until changeover is reset to the [CHANGEOVER TIME]
set value. The backup compressors remain in peak-
load position.
Example for version FS:
2 slave compressors
4 BLS compressors
2 backup compressors
No backup compressor
possible
Example for version RS and SR:
2 slave compressors
4 BLS compressors
2 backup compressors
No backup compressor
possible
On switching over, the network-pressure switching
points are passed on together with the on-load enables
prevailing before changeover.
2.8
Compressor fault
Slave faults can only be taken into account if their fault-
message contacts are wired to the relay module.
If faults occur in a compressor, it is moved to the last
position in the array, and the on-load enable is
disconnected. The available, non-malfunctioning
compressors move up. Once the fault has been
rectified, the compressor(s) is(are) re-incorporated into
the BLS series.
1. Example for version FS
System with 4 compressors, 1 backup compressor,
[BASE LOAD COMP 3], fault K4
Before the fault:
103h K3
K4
k1 k2 r5
{K3+K4 in on-load mode}
Fault
K4
:
103h K3 K1 k2 r5
k!
{K3+K1 in on-load mode}
After fault:
102h K3
K4
k1 k2 r5
On moving to the next BLS array, the new BLS array is
newly configured with the machines available.
2. Example for version FS
System with 4 compressors, 1 backup compressor,
[BASE LOAD COMP 3], [CHANGEOVER TIME 250h],
Fault K4
Before the fault:
14h K3
K4
k1 k2 r5
{K3+K4 in on-load mode}
Fault
K4
:
14h K3 K1 k2 r5
k!
{K3+K1 in on-load mode}
Changeover:
250h K1 K2 k3 r5
k!
{K4 is now scheduled base-
load compressor, but still
under fault conditions}
After the fault:
217h
K4
K1 k2 k3 r5
{K4 re-incorporated after
fault rectification}
K1 K2 K3 R4 R5
↓
K1 K3 K2 R4 R5
K1 K2 K3 K4 K5
↓
K1 K3 K4 K5 K2
↓
K1 K4 K5 K2 K3
↓
K1 K5 K2 K3 K4
K1 K2 R3 R4
↓
K2 K1 R3 R4
K1 K2 K3 K4 K5
↓
K2 K3 K4 K5 K1
↓
K3 K4 K5 K1 K2
↓
K4 K5 K1 K2 K3
↓
K5 K1 K2 K3 K4