Page 32
CPS
– User Manual
“LS / HS” Operation
Requirements
: Alarm level 1
<
Alarm level 2
The LS relay is activated by Alarm 1
The HS relay is activated by Alarm 2
Phases
Action operation
Default
Delay*
T
1
Min. duration LS
operation
Adjustment(s)
: [ 1 …
32767 ]
Minimum duration, in seconds, during which the
ventilator operates at low speed
5 min.
T
2
HS operation delay
Adjustment(s): [ 2
…
32767 ]
Minimum duration for Alarm 2, after which the
ventilator switches to high speed
15 min.
T
R1
R2
LS/HS transition time
1 second (cannot be
changed)
Transition time between Relay 1 and Relay 2 is 1
second (standardized throughout the central
controller)
1 sec.
T
3
Min. duration HS
operation
Adjustment(s): [1
…
32767 ]
Minimum duration, in seconds, for the ventilator to
operate at high speed.
HS relay deactivated if Alarm 1 condition ends
10 min.
T
4
LS-HS stop delay
Adjustment(s)
: [ 1 …
32767 ]
Duration, in seconds, after low or high speed ventilator
operation has been stopped, before the ventilator can
be restarted at low speed.
10 min.
Time values
T
1
,
T
2
,
T
3
and
T
4
can be modified. When the
“
Sensor simulation
” menu is used (see the
chapter on the maintenance menu/simulation on page 43) the times are decreased, by default, to 12
seconds, 24 seconds, 36 seconds, and 24 seconds, respectively.
Note:
An underscale alarm (= fault) activating a LS or HS relay will force the relay into HS position
(with respect to the defined time).
“Forced ventilation” function
This is a forced relay state change via the CPS menu. This function allows you to block or release the
HS (high speed) command at specified times.
Forced relay state change via a logic input command
In both cases the response is immediate and priority safety settings are maintained: HS takes
precedence over LS, and both relays are shut-down if there are contradicting signals.
Summary of Contents for CPS Series
Page 1: ...CPS_CPS 10 System Part Number NPCPSGB Revision J 2 The Fixed Gas Detection Experts User manual...
Page 25: ...CPS User Manual Page 25...
Page 35: ...CPS User Manual Page 35...
Page 54: ...Page 54 CPS User Manual...
Page 57: ...CPS User Manual Page 57 Chapter 8 Annexes JBUS MODBUS Protocol...
Page 58: ...Page 58 CPS User Manual...
Page 59: ...CPS User Manual Page 59...
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Page 73: ...CPS User Manual Page 73 Chapter 9 UE Declaration of Conformity...
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