Fume hood operator display panel interface, QMX3.P88 (FhOdpItf12)

Overview

The application function "Fume hood operator display panel interface 12, QMX3.P88" (FhOdpItf12) is connected to a fume hood controller. The display, alarm lights, alarm horn, and green leaf indicator are controlled based on the current state of the fume hood. The QMX3.P87 provides buttons to put the fume hood in emergency mode, silence alarms and, provide energy efficiency request.

Note
The ODP is not fully functional during setup and commissioning when the administrative mode of the fume hood is "Startup". See the room segment AF Hvac16 for information on the fume hood administrative mode object.

Main features:

Function

 

Command or request (or related)

Notification of condition or status, or availability

Device mode

Interlock (internal signal, not a BACnet object; see Interlocks section for additional information)

LED Display

Alarm indication: The alarm indication screen will display a graphic icon that represents the current alarm state. Alarm indication is a multistate process value object that has 5 states:

  1. No Alarm
  2. Close the sash
  3. Airflow alarm
  4. Critical alarm
  5. Fire

Displaying face velocity or exhaust airflow: The face velocity and exhaust volume can appear unstable when displayed on the ODP. The configuration extension items DspyWght, DspyRslVFace and DspyRslAirFlEh are used to stabilize the displayed value(s).

DspyWght is entered as a percentage and is used to calculate a weighted average.

DspyRslVFace represents the increments of the velocity reading that will be displayed relative to the face velocity setpoint.

DspyRslAirFlEh represents the increments of the exhaust airflow reading that will be displayed relative to the exhaust airflow setpoint.

The control of the fume hood can appear to be slow on the ODP when DspyWght is set low and a large sash adjustment happens. The unfiltered face velocity with DspyRslVFace or exhaust volume with DspyRslAirFlEh applied will be displayed when the exhaust airflow setpoint changes by more than 20% compared to the previous exhaust airflow setpoint. The unfiltered reading will be used until the difference between velocity/volume and setpoint is less than or equal to DspyRslVFace / DspyRslAirFlEh.

The face velocity setpoint to ODP, SpVFaceOdpCol, is set to the same value as the fume hood face velocity setpoint.

The exhaust air flow setpoint to the ODP, SpAflEhOdpCol, is set to the same value as the fume hood exhaust air flow setpoint.

The ODP configuration extension item DspyValue determines if the face velocity or exhaust volume is displayed. The value displayed on the ODP is calculated for both VFaceOdp and SpVFaceOdpCol.

Alarm Lights: The red, yellow, and green LED alarm lights (RedLedOdp, YlwLedOdp, and GrnLedOdp) on the ODP have 6 operational states.

  1. Continuously Off
  2. Flash (100ms / 900ms)
  3. Blink (500ms / 500ms)
  4. Blink 5 times, then stop
  5. Blink 5 times every minute
  6. Continuously On

The values of the multistate objects for the LEDs are determined by the inputs Fh Mode, Effective Administrative Mode, and Air Flow Alarm.

Alarm Horn: The alarm horn (BzzModOdp) on the ODP has 6 operational states.

  1. Continuously Off
  2. Short Buzz (100ms / 900ms)
  3. Long Buzz (500ms / 500ms)
  4. Buzz 5 times, then stop
  5. Buzz 5 times every minute
  6. Continuously On

The value of the multistate object for the alarm horn is determined by the inputs Fh Mode, Effective Administrative Mode, Sash Alert, Sash Open Time, and Air Flow Alarm.

The horn should be turned on after the silence button has been pressed and the alarm condition has not cleared and a new alarm comes in. Silencing the horn is a local function in the ODP. The AF does monitor the horn silence button (BzzSlncIn) and updates a multistate output (BzzStaOdp) with 3 possible states.

  1. No Alarm
  2. Alarm Active, Alarm Horn On
  3. Alarm Active, Alarm Horn Silenced

If BzzSlncIn is activated while FhSashOpnAlrt is active, the timer for the switch-on delay for the sash opening alert will be reset.

Green Leaf: The Green Leaf LED (EeiOdp) on the ODP has 5 operational states.

  1. Undefined
  2. Poor
  3. Satisfactory
  4. Good
  5. Excellent

Control of the green leaf LED color is handled within the ODP. It will be green when EeiOdp has a value of 4 or higher, red if a value of 2 or 3, and off if a value of 1.

The value of the multistate object for the green leaf LED is determined by the inputs Fh Mode, Effective Administrative Mode, Air Flow Alarm, Sash Alert, Fh Air Flow Setpoint, Fh Air Flow Minimum and a energy efficiency indication from the setpoint AF.

Configuration

Parameters

Description

Parameter

Default value

Display resolution for face velocity
▶ The ODP continuously displays the weighted face velocity when DspyRslVFace is set to zero. Resetting DspyRslVFace to a value other than zero displays the weighted face velocity incrementally. A DspyRslVFace setting of 5 FPM will result in values being displayed in increments of 5 from the face velocity setpoint (for example if the face velocity setpoint is 90, values of 80, 85, 90, 95, 100, etc. would be displayed).

DspyRslVFace

0.02 [m/s]
3.9 [ft/min]

Display resolution for exhaust air volume
▶ The ODP continuously displays the weighted exhaust air volume when DspyRslAirFlEh is set to zero. Resetting DspyRslAirFlEh to a value other than zero displays the weighted exhaust air volume incrementally. A DspyRslAirFlEh setting of 10 will result in values being displayed in increments of 10 from the exhaust air volume setpoint (for example if the exhaust air volume setpoint is 225, values of 205, 215, 225, 235, 245, etc. would be displayed).

DspyRslAirFlEh

5 [m3/h]
2.9 [ft3]
1.39 [l/s]

Display weight
▶ If DspyWght is set to 100%, the face velocity or exhaust air volume displayed at the ODP may fluctuate rapidly. This rapid fluctuation is due to the constant adjustments of the FHC. When DspyWght is set to a value less than 100%, the face velocity or exhaust air volume displayed at the ODP is a weighted calculated value. This value is used to stabilize the ODP displayed value only; it has no effect on the control sequence.

If you set DspyWght to zero, the Operator Display Panel will “freeze” at the last read value. Setting DspyWght to a value other than zero (suggested value is 30%) allows the Operator Display Panel to update the displayed face velocity.

DspyWght

100 [%]

Switch-on delay for sash opening alert
▶ The length of time after FhSashOpnAlrt turns on before the buzzer will start to beep. It is also the time after the buzzer silence is pressed in response to a sash open alert before the buzzer will start beeping again.

DlyOnSashAlrt

300 [s]

Enable sash tone

▶ Set to yes to allow the buzzer to be activated in the event of a sash opening alert or in the event of a sash maximum opening alert.

0:No
1:Yes

EnSashTone

0:No

Switch-off delay for sash maximum opening buzzer
▶ The buzzer will be immediately turned on in the event of a sash maximum opening alert. The buzzer will be automatically silenced after the time defined. The auto silence feature is disabled when DlyOffSshmBzz is set to 0.

DlyOffSshmBzz

0 [s]

Air velocity unit
▶ Defined by selected engineering unit – do not change.

AirVUnit

[m/s]
[ft/min]

Air volume flow unit
▶ Defined by selected engineering unit – do not change.

AirFlUnit

[m3/h]
[ft3]
[l/s]

Interface

Interface

Description

Type

Ref.

Owned by

BzzSlncInCol

Collection of buzzer silence input value

ColView

●

-

 

BzzSlncInRs

Result of buzzer silence input value

0:Off
1:On

BCalcVal

●

-

 

BzzSlncIn

Buzzer silence input value

0:Off
1:On

BCalcVal

◉

Room segment / Field device

GrnLedOdpCol

Collection of ODP green LED mode

ColView

●

-

 

GrnLedOdp

ODP green LED mode

1:Off
2:Short flash
3:Flash
4:5 flashes
5:5 flashes/Minute
6:On

MPrcVal

◉

Room segment / Field device

YlwLedOdpCol

Collection of ODP yellow LED mode

ColView

●

-

 

YlwLedOdpCol

Collection of ODP yellow LED mode

Enumeration see ODP green LED mode

MPrcVal

◉

Room segment / Field device

RedLedOdpCol

Collection of ODP red LED mode

ColView

●

-

 

RedLedOdp

Collection of ODP red LED mode

Enumeration see ODP green LED mode

MPrcVal

◉

Room segment / Field device

AlmIndOdpCol

Collection of alarm indication for ODP

ColView

●

-

 

AlmIndOdpCol

Collection of alarm indication for ODP

1:Blank
2:Close the sash
3:Air volume flow
4:SOS
5:Fire
6:High temperature

MPrcVal

◉

Room segment / Field device

EeiOdpCol

Collection of ODP energy efficiency indicator

ColView

●

-

 

EeiOdp

ODP energy efficiency indicator

1:Undefined
2:Poor
3:Satisfactory
4:Good
5:Excellent

MPrcVal

◉

Room segment / Field device

BzzModOdpCol

Collection of ODP buzzer mode

ColView

●

-

 

BzzModOdp

ODP buzzer mode

1:Off
2:Short buzz
3:Long buzz
4:5 buzz
5:5 buzz/Minute
6:On

MPrcVal

◉

Room segment / Field device

BzzStaOdpCol

Collection of buzzer state for ODP icon

ColView

●

-

 

BzzStaOdp

Buzzer state for ODP icon

1:Off
2:On
3:Silenced

MPrcVal

◉

Room segment / Field device

AirFlEhOdpCol

Collection of exhaust air volume flow for ODP

ColView

●

-

 

AirFlEhOdp

Exhaust air volume flow for ODP

APrcVal

◉

Room segment / Field device

VFaceOdpCol

Collection of face velocity for ODP

ColView

●

-

 

VFaceOdp

Face velocity for ODP

APrcVal

◉

Room segment / Field device

SpVFaceOdpCol

Collection of face velocity setpoint to ODP

ColView

●

-

 

SpVFaceOdpCol

Collection of face velocity setpoint to ODP

APrcVal

◉

Room segment / Field device

SpAflEhOdpCol

Collection of exhaust air volume flow setpoint to ODP

ColView

●

-

 

SpAirFlEhOdp

Exhaust air volume flow setpoint to ODP

APrcVal

◉

Room segment / Field device

FhSashOpnAlrt

Fume hood sash opening alert

BPrcVal

◉

Hvac16

FhSashMaxAlrt

Fume hood sash maximum opening alert

BPrcVal

◉

Hvac16

FhUseExcd

Fume hood use exceeded

0:Off
1:On

BCalcVal

●

-

Engineering and commissioning

The ODP is not fully functional during setup and commissioning when the administrative mode of the fume hood is "Startup". See the room segment AF HvacLgt16 for information on the fume hood administrative mode object.