Table of Contents
Advertisement
Operating Procedures
The chiller control setpoint screen allows you to enter a
value within setpoint range in °C or °F depending on the
HMI configuration. Digital Input #4 enables the digital offset
functionality. When this input is on, the digital offset display
turns blue and the accompanying pilot lights up.
Remote Setpoint
When enabled it ignores the user setpoint and reads
analog input #1. This function requires:
•
Inputs:
–
Remote Setpoint – Analog Input #1 – range:
Settable on the admin version of the control pop-up.
–
Remote Setpoint Enable – Digital Input #3.
•
Parameter:
–
Remote Set Enable – set to Absolute.
Figure 15. Chiller setpoint control - Remote setpoint
Note: Actual Setpoint equals Remote Setpoint.
With Digital Offset
Remote setpoint and the digital offset can be combined:
34
Figure 16. Chiller setpoint control - Remote setpoint
with digital offset
In this situation, the controller adds the offset value to the
remote setpoint value.
Example: 49.3 + 1.4 = 50.7
This requires everything in the previous section plus the
Remote Offset Enable input (#4).
Remote Offset
Remote Offset and Digital Offset can be used concurrently:
Figure 17. Chiller setpoint control - Remote offset
with digital offset
To use this scenario the controller requires:
•
Inputs:
–
Remote Offset Enable – input #4.
•
Parameters:
–
Remote Set Enable – set to Relative.
The actual setpoint is calculated:
User Setpoint + Digital Offset+ Remote Offset
42.3 + 1.4 + 0.2 = 43.9
ARTC-SVX007A-EN
Advertisement
Table of Contents
