Unit Disable Option; Figure 51 Unit Disable Option; Figure 52 Damper Power Output - Bard MEGA-TEC W090A Service Instructions Manual

Unit Disable Option

The wall-mount unit can be disabled by opening a
dry set of contacts connected to Input DI1 on the
PLC board. This feature can be used in addition to
the emergency off feature provided by the LC6000
to ensure that the unit does not operate even when
in orphan mode. This feature is disabled by default
and must be enabled before the input will affect unit
operation. When the input detects open contacts, all
unit operation will stop and the dampers will close.
This is an automatic reset feature that will resume
operation as soon as the unit detects the contacts are
closed again.
For applications that require the dampers to close
rapidly, the 24VAC power supplied to each actuator
should be removed so the actuator spring returns.
In normal operation, the dampers can take up to 2
minutes to close from fully open. When the 24VAC
power is removed from the actuator, the dampers will
close in under 30 seconds using the spring return on
the actuator.
Beginning with software version MGS1000.1.3.0,
output NO9 can be wired in series with the actuators
to utilize the spring return when unit disable or
emergency off are active on the controller.
NOTE: Alarm logging and trend logging will not be
available if power is removed from the controller
and unit offline alarms will be recorded on the
LC6000.
The unit disable input can be verified and adjusted by:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Digital Inputs;
press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Ins 1/2.
6. Reference Disable row and En column (see Figure
51).
FIGURE 51
Unit Disable Option
7. Press ENTER key to scroll to Disable En value.
8. Press UP or DOWN key to change value.
9. Press ENTER key to scroll to Dir.
10. Press UP or DOWN key to change direction (N/O or
N/C), if applicable.
11. Press ESCAPE key several times to return to Main
Menu screen.
To verify the status of the damper power output:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Digital
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Outputs
2/6 (see Figure 52).
FIGURE 52
Damper Power Output
If the function of the output needs to be verified, the
output can be put into override. To override the output:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Digital
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Outputs
6/6 (see Figure 53 on page 36).
6. Press ENTER key to scroll to Enable Override.
7. Press UP or DOWN key to change from No to Yes.
8. Press ENTER key to scroll to Damper Power.
10. Press UP or DOWN key to set to On to power the
actuator or Off to spring return the actuator.
NOTE: This override will only last for 5 minutes and
then return to normal operation.
Manual 2100-671C
Page 35 of 59