Document: LT0400 4100ES-S1 Programming Guide
AS1668 Fan Controls
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.
Mechanical 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]
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