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Limitation of Digital Compressor Capacity
The capacity of the digital compressor can range from
10-100%.
Proportional Band Regulation - Only for Fans
The fan regulation band Pb is divided by the number
of fans:
The numbers of fans switched ON is proportional to the
value of the input signal: when this distances itself from
the target set point and enters the various bands, the
compressors are switched ON, to be then turned OFF
when the signal brings near the set point.
In this way if the pressure is greater than regulation
band, all the fans are on, if the pressure (temperature)
is lower than the regulation band all the fans are off.
Regulation According to the Running Hours
The algorithm switch on and off the loads according to
the running hours of each load. In this way the running
hours are balanced.
Example
2 Fans: oA2 =FAn; oA3 = FAn;
Fan Regulation
Pb Proportional band zone width
(00.10-5.00bar/0.5-30°C or 1-80PSI/1-50°F).
Set the dEU parameter and the target set point for
fans before setting this parameter.
The band is symmetrical compared to the target set
point, with extremes: SETF+Pb/2 - SETF -Pb/2.
The measurement unit depends on the dEU
parameters.
Use of the Programming Hot Key
(Requires Optional Hot Key Programming Kit)
How to Program a Hot Key from the Controller
(UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the Hot Key
and push the
appears followed a by flashing "End"
3. Push "SET" key and the End will stop flashing.
4. Turn OFF the controller remove the Hot Key,
then turn it ON again.
© 2013 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
Application Engineering
B U L L
key; the
"uPL" message
E T I N
NOTE: The "Err" message is displayed for
failed programming. In this case push the
key again if you want to restart the upload
again or remove the Hot Key to abort the
operation.
How to Program a Controller using a Hot Key
(DOWNLOAD)
1. Turn OFF the controller.
2. Insert a programmed Hot Key into the 5 PIN
receptacle and then turn the Controller ON.
3. Automatically the parameter list of the Hot Key
is downloaded into the Controller memory,
the "doL" message is blinking followed a by
flashing "End".
4. After 10 seconds the controller will restart
working with the new parameters.
5. Remove the Hot Key.
NOTE: The message "Err" is displayed for failed
programming. In this case turn the unit off and
then on if you want to restart the download again or
remove the Hot Key to abort the operation.
The unit can UPLOAD or DOWNLOAD the
parameter list from its own internal memory to the
Hot Key and vice-versa.
15
AE8-1386 R1
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