VMS-1655M
LIT-12013297
9
Applying power
Follow the correct installation of the VMS-1655M, apply
power to the unit, and conrm that you hear a brief chirp at
the touchscreen display. There is a 6 s power-up delay during
which time, the 360° Safety Halo cycles through the following
colors: red, green, blue, yellow, magenta, cyan, and white.
After this power-up delay, the unit displays a brief 5 s
animation of the action icons, followed by the VMS-1655M
splash screen. The splash screen displays the model number,
electronic serial numbers, rmware version numbers, and
current network address. The splash screen displays for
about 15 s, and then proceeds to the main display screen.
Use the About This VMS option on the diagnostics menu to re-
display the information that shows on the splash screen during
the power-up sequence.
Main display screen
All VMS-1655M units ship from the factory in the
decommissioned operating mode, which is represented by
a blue graphical screen with a disabled status icon at the
center of the screen. The information that displays on the main
screen includes the following information from top to bottom:
• Current operating mode and status
• Status icon centrally located
Located at the bottom of the display is an audible toggle
button.
While in decommissioned operating mode, the screen
background is blue. However, while in occupied mode, the
screen background represents the current alarm status of
the unit. A green background with a check mark at the center
indicates that the current face velocity is within enableable
limits of the required setpoint.
A yellow background with an exclamation point at the center
indicates that the current face velocity drifts outside the
enableable limits of the required setpoint and is in the caution
range. A red background with an exclamation point at the
center indicates that the current face velocity reaches a critical
unsafe condition, as it is beyond the safe operating range.
An alarm buzzer sounds at this screen and also provides an
audible alert of the unsafe conditions.
Conguring the vortex monitor
The initial setup of the VMS-1655M Vortex Monitor involves
the following simple steps:
• Calibrate vortex sensor
• Congure face velocity alarm setpoints
Calibrating the vortex sensor
The standard VMS-1655M comes pre-congured and pre-
calibrated with a vortex sensor that is installed in the sidewall
of the monitored fume hood.
After installation, to begin the calibration of the vortex sensor,
complete the following steps:
1. Touch the touchscreen display anywhere other than one
of the hotspot locations to enter the Main Setup Menu. See
page 13 for hot spots features.
2. From the Main Setup Menu, select Unit Setup > Hood
Setup > Field Calibration. At this initial eld calibration
screen, cap the vortex velocity sensor to prevent air ow.
3. Conrm that the sensor pressure reading is at 0.00 pascals,
and tap the Next button to proceed to the next eld calibration
screen.
4. With the sash positioned at a height of 18 in., measure the
face velocity in 3 locations across the sash opening with a
calibrated air ow measuring instrument.
5. Use the slider on the eld calibration screen to enter the
average of the three velocity readings.
6. Tap the OK button to complete the eld calibration
procedure of the fume hood vortex sensor.
Conguring face velocity alarm setpoints
The VMS-1655M features a comprehensive alarm facility that
includes both audible and visual capabilities. To congure the
alarm setpoints for the face velocity, complete the following
steps:
1. Touch the touchscreen display anywhere other than one
of the hotspot locations to enter the Main Setup Menu. See
page 13 for hot spots features.
2. From the Main Setup Menu, select System Setup > Alarm
Limits.
3. Use the popup numeric keypad on the touchscreen display
to enter the High Alarm, High Warning, Low Warning, and
Low Alarm setpoints. The default settings for the occupied
mode face velocity alarm setpoints are 150 fpm, 130 fpm, 90
fpm, and 75 fpm.
Changing fume hood operating mode
You can set the VMS-1655M vortex monitor for occupied, and
decommissioned modes of operation. To change the mode
of operation, select Unit Setup > Hood Setup > Operating
Mode to prompt you to select one of two modes.
Setting a deadband
The VMS-1655M vortex monitor has a deadband feature to
help keep the actuator control signal constant until the sensed
velocity has gone above or below the deadband limit.
To set the deadband, select Unit Setup > Hood Setup > Set
Deadband and use the numeric keypad to enter the deadband
value as a percentage using the numeric keypad. Click Finish
to save the setting.
