VMS-1655M
LIT-12013297
10
To quickly change the operating mode from the main display
without entering the user menus, use the Hood Status hotspot
to invoke the Operating Mode selection pop-up. See Figure 7.
The alarm buzzer may be selected for one of two modes of
operation: Audible or Silent Mode. If audible mode is selected,
a delay may be specified in seconds or minutes.
If Silent Mode is selected, then the alarm buzzer will not sound
whenever the unit encounters an alarm condition. The alarm
buzzer will reset to audible mode when alarm condition has
cleared
The VMS-1655M can be monitored over a BMS network using
the BACnet MS/TP protocol available at CN7 terminal on the
VMS-1655M- User Interface display. Refer to page 17 for CN7
location.
The VMS-1655M also provides an analog output signal that
linearly represents the exhaust air flow when a flow pressure
sensor is connected to the analog input at the VMS-1655M
vortex sensor. This output may be connected to an available
analog input on a third party controller, thereby allowing the
hood exhaust air flow to be monitored from the BMS front-
end.
Changing network settings
To change network settings on the VMS-1655M, select
Unit
Setup
>
Network Setup
. The
Network Setup
menu presents
you with the available options.
All VMS-1655M units have a BACnet MS/TP protocol and the
Network Setup
menu options relate to this protocol. From
this menu, you can select a different baud rate or change the
network address of the unit.
Adding password security
You can add up to ten multi-level passwords to the system to
protect the VMS-1655M menu system. To create a password
entry, complete the following steps:
1. Select
System Setup
>
Passwords Setup
>
Add
Password
to prompt you to enter a minimum of four digits and
a maximum of eight digits.
2. When you enters a password, the system prompts you to
specify one of four access levels: Unrestricted, Standard,
Basic, and Restricted. All password entries save to non-
volatile memory.
In the event of a forgotten password, a factory-default
password provides unrestricted access to the user menu
system. Consult with the factory for more information about
this password. The first user password automatically saves as
unrestricted.
Changing display settings
The
360° Safety Halo feature significantly enhances the status
visibility of individual units, and enables an unsafe fume hood
to be immediately recognized from anywhere in the laboratory
space. Use the
360° Safety Halo option on the Display Setup
menu to configure the display settings of this feature. Disable
this option if the installation does not require it, which simply
turns off the 360° Safety Halo status indicator. If you enable
this option, you can adjust the brightness from full intensity to
barely visible in daylight conditions.
You can also use the
Set Brightness
option on the
Display
Setup
menu to adjust the brightness of the VMS-1655M main
display screen. All brightness settings store to non-volatile
memory and remain in effect through a power cycle.
Built-in diagnostics
The VMS-1655M incorporates several useful diagnostic
tools to diagnose and troubleshoot the system during the
installation and commissioning phase. The
Override PID
Out
option enables an override of the analog output. You can
lock the analog output at the overridden percentage, while
test and balance makes adjustments to the exhaust damper.
If you enable this option, the analog output disconnects from
its control loop while in the overridden state. If you cancel the
override, the normal control loop operation resumes.
A unique feature of the VMS-1655M is the real-time view
option, which enables you to see in real-time the actual face
velocity, actuator deadband, actuator position, and exhaust
flow.
Figure 11: Operating mode election pop-up screen
Figure 12: Alarm buzzer may be set for audible