Manual 2100-671C
Page
35 of 59
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).
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 51
Unit Disable Option
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.
Summary of Contents for MEGA-TEC W090A
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Page 111: ...Manual 2100 479 Page 6 of 11 FIGURE 1 TYPICAL AIR CONDITIONING SYSTEM COOLING CYCLE MIS 369...
Page 112: ...Manual 2100 479 Page 7 of 11 FIGURE 2 TYPICAL HEAT PUMP SYSTEM COOLING CYCLE MIS 368...
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