Yaskawa APOGEE FLN - Manual (Page 15)

YASKAWA TOEP YAICOM 10A Z1000 Bypass Network Protocol Apogee FLN Technical Manual
15
‹ Field Panel Controlled Feedback
In this strategy, the sensor is connected to the APOGEE FLN network at a remote location, and the control loop is executed in PPCL. The
drive speed command is passed from the field panel to the drive by commanding INPUT REF 1 (Point 60).
CAUTION
This strategy is not recommended because it means that the loop is being closed over the network.
Delays due to processor scan time and network traffic can cause control to be degraded or lost.
Damage to HVAC equipment may result.
Unbundle the FEEDBACK
To unbundle the feedback (PI FEEDBACK) for monitoring in degrees Fahrenheit:
New Intercept = 30
New Slope = (250 - 30)°F x (0.01)
(100 - 0)%
= 0.022
New Slope = (Desired Range) x (Slope of Existing Point)
(Range of Existing Point)
Formula Notes:
Desired Range = Range Maximum – Range Minimum
Range of Existing Point = Existing Range Maximum – Existing Range Minimum