Manual No. 4801- 2997 Rev 1-15
Secondary Sensing System
21 of 42
SPECIAL FEATURES IF CONNECTED TO EVOLUTION 3000/3001
7.1.4 Fail-Safe Relay Operation
There are two types of Relay strips used in the Evolution 3000. The Normally Open (NO) strip requires a
signal from the controller board in order to energize a stage of ventilation. Should power be removed from
the EV-3000 the Normally Open Relay strips would not be able to energize a ventilator. On the other hand
the Fail-Safe relay strip would close each of the relays in the strip resulting in energizing the ventilators in
case of a controller power failure. Each of the relay strips contains four relays for controlling four stages.
In the EV-3000 there are a total of four relay strips, three will be N.O. and one will be a Fail-Safe. The
operator must insure that the Fail Safe relay strip is connected only to stages that should be turned on in
case of a controller failure. See the
EV-3000 Owners Manual Part No. 4801-5307
for a physical
description of the relay strips. The
S
3
Stand-Alone Unit (Plus) also contains a Fail-Safe. It is not
recommended to place heating equipment on Fail-Safe stages.
7.1.5 Setting EV Back-Up Stage Jumpers
Pictured at the right is a Stage Relay Board consisting
of four stage relays and the associated stage jumper for
each stage relay. This board is located in the EV-3000
or EV-3001 controller. The stage jumpers are labeled
COOL 1, COOL 2, COOL 3 and HEAT. Location of
the jumper places the equipment on one of these four
Back-Up Stages, or if the jumper is not inserted, the
equipment is not placed on Back-Up. The jumpers
should be placed based on the operation of stage
equipment and should be the same as assigned in the
EV-3000 Controller. Jumpers are placed according the
following table:
Type of Stage
Operation
Jumper
Assignment
Cool Negative Fan
COOL 1
Cool Negative Tunnel Fan
COOL 2
Cool Tunnel Fan
COOL 3
Heat Stage
HEAT
Stage not on Back-Up
No Jumper
Installed
Additional information can be found in the Evolution
3000 Owners Manual, Part Number 4801-5307.
7.1.6 Vent/Tunnel Inlet Override Operation
The S
3
contains override relays to operate your
Vent
or
Tunnel
inlets during Back-Up situations. It is
intelligent enough to understand how it needs to operate these overrides in a manner that will not disrupt
what the main control system is trying to do.
Typical operation results in the
Tunnel
inlet being overridden open anytime the Back-Up stage
Cool3
is
on. Otherwise, if
Cool1
or
Cool2
is on, the S
3
will override the
Vent
inlets open. This is the correct
assumption most of the time but there are exceptions. It is important to note that if
Cool3
is turned on, the
S
3
will turn off
Cool1
which, in turn, will disable the
Vent
inlet override. This allows the Back-Up system
to perform in much that same manner as the main control system would function during tunnel ventilation.
If connected to the Evolution 3000/3001, the S
3
communicates with the master controller. Therefore, it is
aware of what type ventilation mode the controller is currently in. For example, if the main controller is in
tunnel ventilation. The S
3
will not allow
Cool1
to turn on. The reason is due to the fact that it knows that
this is your sidewall fans. Therefore, it understands that it would be detrimental to the ventilation to turn
them on. This, in turn, also disables the
Vent
inlets from opening.
STAGE RELAY BOARD
Stage Relay
COOL 3
COOL 2
COOL 1
HEAT
Stage
Jumpers
