Operating Instructions

Fume Hood Monitor Owner's Manual
6-4 Siemens Building Technologies, Inc.
Descriptor Address Application Description
MID FVEL 83 651 Represents the field calibration mid face velocity. The mid face
velocity is found using the portable velocity probe and moving the
sash to a mid calibration velocity position.
MID DONE 84 651 The person performing calibration toggles this point to save the
entered mid velocity calibration value to EEPROM.
MIN FVEL 85 651 Represents the minimum field calibration face velocity. The
minimum face velocity is found using the portable velocity probe
and moving the sash to a minimum calibration velocity position.
MIN DONE 86 651 The person performing calibration toggles this point to save the
entered minimum velocity calibration value to EEPROM.
CAL COMPLETE 87 651 Changing this point to YES (when CAL REQUEST (Point 81) is set
to YES) will complete the field calibration procedure and store the
values entered in address Points 81 through 86 into EEPROM.
When this point is set to YES, the new calibration values are set
and the point CAL REQUEST (Point 80) automatically changes to
NO.
CAL RAW 88 650, 651 Raw counts used for diagnostic purposes.
CAL TIME 89 651 The amount of time the FHM samples velocity during a calibration
procedure.
BLANK DISP 91 650, 651 When set to YES, the face velocity is not displayed on the FHM.
DISPLAY RES 92 650, 651 A Change Of Value (COV) limit for the face velocity shown on the
LCD. The display does not update unless the change in face
velocity exceeds this value.
ENG UNITS 93 650, 651 Toggles the display of the FHM from ft/min to m/s. Toggling this
point does not affect the displayed value in CIS at the Portable
Operator’s Terminal.
LAMP TEST 94 650, 651 Turns on all lights, the audible horn, and energizes the alarm relay.
DISPLAY WT 95 650, 651 Factor used to filter out large changes in the value of the point
FACE VEL (Point 4), which is displayed on the LCD. This value is
a percentage that is used to average a portion of the current
average face velocity with a portion of the previous average face
velocity. The value of this point is a percentage of the current
average face velocity.
ALARM TIME 96 650, 651 Time delay used to detect sudden changes in face velocity and
eliminate false alarms. The average face velocity must rise above
any of the set limits (e.g., HI ALM LIMIT) for the amount of time
specified at this point before the FHM indicates an alarm condition.
DISPLAY MIN 98 650, 651 The value of this point controls the lowest value the LCD will show.
Below this value (in fpm or m/s), the display shows zero.
ERROR STATUS 99 650, 651 The status code that indicates any errors detected during FHM
power-up. A status of 0 (zero) indicates that there are no problems.