Oldham CPS Series User Manual

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.

Oldham CPS Series Specifications

General

Brand	Oldham
Model	CPS Series
Category	Gas Detectors
Language	English