2. DELCOS 3100 Base-Load Sequencing
48
1. Example for version RS and SR:
System with 4 compressors, 1 backup compressor,
[BASE LOAD COMP 3], fault K4
Before the fault:
103h K1 K3
K4
k2 r5
{K1+K3+K4 in on-load mode}
Fault
K4
:
103h K1 K3 K2 r5
k!
{K1+K2+K3 in on-load mode}
After fault:
102h K1 K3
K4
k2 r5
On moving to the next BLS array, the new BLS array is
newly configured with the machines available.
2. Example for version RS and SR:
System with 4 compressors, 1 backup compressor,
[BASE LOAD COMP 3], [CHANGEOVER TIME 250h],
Fault K4
Before the fault:
14h K1 K3
K4
k2 r5
(K1+K3+K4 in on-load mode}
Fault
K4
:
14h K1 K3 K2 r5
k!
{K1+K2+K3 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 K1
K4
K2 k3 r5
{K4 re-incorporated after
fault rectification}
2.9
BLS active message
The slave compressors normally have their own or an
internal pressure switch for controlling on-load/off-load
operation. In conjunction with coupling relays, the BLS
active message can be used to disconnect the slaves
from their internal pressure switches, i.e. control takes
place exclusively through the master's load request.
If the BLS system fails, the slave compressor can, in
this way, switch over to its own pressure switch.
2.9.1
Via the spare-out output (option)
The BLS active function can be activated via the
master's spare out using code 9348. The relay is pulled
in when [OPERATION ON/TIMER] is active. The relay
drops out if the following events prevent the BLS master
from passing on load enables to the machines
[OPERATION OFF/—]:
1. BLS is deactivated in the menu
2. Master without power supply
3. Fault: network pressure sensor B1
4. Warning: MS bus: A06 (relay module failed for
activating slaves)
2.9.2
Via the BLS module
If the sum of slaves and backup machines is less than
four, one relay is unused on relay module A06. This
relay then accepts the BLS active message. This way,
the spare out can remain free for other messages.
2.10
Messages to higher-order system
when BLS is not activated
(version RS and SR only)
If the number of slave + backup compressors = 0 and
the BLS operating mode = OFF, the relay outputs on
the BLS module report the following:
Relay A06.0 The speed-controlled machine is at 100%
full load
Relay A06.1 The speed-controlled machine is in off-
load mode
Relay A06.2 The speed-controlled machine is in on-
load mode
Relay A06.3 Version RS: Speed control activated (not
off or being bypassed)
Version SR : Reserved
