Door Alarm; Sensor Failure Alarm; Alarm Sequence; Dpm Inputs And Outputs - Siemens 125-2134 Owner's Manual

Differential Pressure Monitor Owner's Manual
Anteroom
If the differential pressure rises above the high limit and remains so longer than the time set
in the alarm delay, the high pressure alarm will turn on and the DPM's LCD displays
and
PRESSURE
The alarm clears when the differential pressure falls below the high limit and the DPM's LCD
no longer displays

Door Alarm

When the door is open the DPM's LCD displays
than the time set in the door delay the alarm turns on.
The alarm clears if the door is closed and the DPM's LCD will no longer display

Sensor Failure Alarm

If one or both of the RPTs lose power or fails the DPM's LCD displays
The alarm clears when one or both RPTs return from power loss or failure. The DPM's LCD
no longer displays

Alarm Sequence

When the DPM detects the alarm conditions described in Pressure Alarms or Sensor Failure
Alarm, ALARM STATUS (Point 26) changes from NORMAL to ALARM and:
•
Normal LED (green) turns OFF.
•
Alarm LED (red) turns ON and flashes.
•
If it has not been disabled, the horn sounds. To silence the horn, push the Horn
Silence button on the front cover of the DPM. The horn will not sound again until all
alarm conditions have cleared (ALARM STATUS returns to NORMAL) and a new
alarm is present (ALARM STATUS changes from NORMAL to ALARM).
•
The LCD displays the appropriate alarm status message.

DPM Inputs and Outputs

Door Switch Input – Leaks should be minimized to maintain room pressurization. One
contributor to leaks is the entry door. If using a door contact switch, a door delay is activated
when the door is opened to allow the door a chance to close before activating the alarm. This
minimizes nuisance alarms due to door position.
Alarm Relay Output – The DPM's alarm relay output is used for remote monitoring of alarms.
The contact relates to how the alarm is powered and wired.
10
.
ANTEROOM
and
HIGH PRESSURE
.
GENERAL FAILURE
.
ANTEROOM
. If the door remains OPEN longer
DOOR OPEN
Siemens Building Technologies, Inc.
HIGH
.
DOOR OPEN
.
GENERAL FAILURE