Document: LT0400 4100U-S1 Programming Guide
AS1668 Fan Controls
Issue 1.4 15 December 2010 Page 10-9
10.5 AS1668 Custom Control Equations
The control of the fans and the AS1668 LEDs as described in Section 10.2 is done using
custom control equations in custom control program 7: AS1668 FAN CONTROL CUSTOM
CONTROL. Alarm/Active Test and Fault Test Custom Control resides in Program 5 -
ALARM / ACTIVE and FAULT TESTS.
Equations provided in the template have a Pseudo point entered for the input and output
devices. These should be replaced with the actual module address as shown in the
following example:
Template Custom Control equations for Fan1 start is
[INPUTS]
STATUS ON
P521 | DIGITAL | UTILITY | A/C TRIP
AND NOT STATUS ON
P1298 | DIGITAL | UTILITY | FAN STOP RELAY SUBSTITUTE
OR STATUS ON
P1201 | DIGITAL | UTILITY | FAN #1 MANUAL START
[END INPUTS]
[OUTPUTS]
TRACK ON PRI=9,9
P1297 | DIGITAL | UTILITY | FAN START RELAY SUBSTITUTE
[END OUTPUTS]
Should be modified to:
[INPUTS]
STATUS ON
P521 | DIGITAL | UTILITY | A/C TRIP
AND NOT STATUS ON
M1-3-0 | RIAM | RELAY | FAN 1 STOP RELAY
OR STATUS ON
P1201 | DIGITAL | UTILITY | FAN #1 MANUAL START
[END INPUTS]
[OUTPUTS]
TRACK ON PRI=9,9
M1-5-1 | MRELAY | RELAY | FAN 1 START RELAY
[END OUTPUTS]
The following is an example of required custom control equations to control fan #1. In this
example, the fan start is controlled by point M1-5-1 which is an output relay on a TRIAM
module. The airflow status uses M1-5-2 and the fan stop is via M1-3-1, which is a RIAM.
Mech board fault is on address M1-7-2.
10.5.1 FAN FAULT and S/A RESTART DELAYS-STARTUP
This equation loads the setpoint values to A260 and A261, 1 second after start up or
rebooting so the other Custom Control uses a value of zero on start up. If the delay is not
included, all supply fan stop relays will operate until the timer expires.
[INPUTS]
NOT STATUS ON
P32 | DIGITAL | TROUBLE | COLD START
OR NOT STATUS ON
P33 | DIGITAL | TROUBLE | WARM START
DELAY CONSTANT 1
A259 | Analog Timer | ANALOG | ANALOG | FAN CUSTOM CONTROL START UP DELAY
[END INPUTS]
[OUTPUTS]
SET CONSTANT 15 SECS
A260 | Set-Analog (Destination) | ANALOG | ANALOG | FAN FAULT DELAY SETPOINT
SET CONSTANT 60 SECS
A261 | Set-Analog (Destination) | ANALOG | ANALOG | S/A DETECTOR RESTART DELAY SETPOINT
[END OUTPUTS]
To Next Page
Loading...
Need help?
General
