Danfoss VLT FC 103 Programming Manual page 167

Parameter Description
28-81 dP0 Offset
Range:
3 3
28-82 P0
Range:
-999999.999 -
999999.999
28-83 P0 Setpoint
Range:
-999999.999 -
999999.999
28-84 P0 Reference
Range:
-999999.999 -
999999.999
28-85 P0 Minimum Reference
Range:
-999999 -
999999
28-86 P0 Maximum Reference
Range:
-999999 -
999999
3.21.4 28-9* Injection Control
The injection ON/OFF signal is a forced close signal to the
case controllers (to turn display cases off). The signal is
distributed by following means- hardwired through a
digital output/relay or soft wired via bus by gateway or
system manager.
166
Function:
the feedback is assumed to be a pressure
converted to an equivalent temperature via
the pressure-to-temperature conversion
functions selectable in 20-01 Feedback 1
Conversion, 20-03 Feedback 2 Source or
20-06 Feedback 3 Source.
Function:
[] The feedback pressure measured on
the analogue inputs, converted to an
equivalent temperature.
Function:
[] The setpoint of the frequency
converter excluding any offset
programmed into 28-81 dP0 Offset.
Function:
[] The sum of the setpoint of the
frequency converter (28-83 P0 Setpoint)
and the offset programmed into
28-81 dP0 Offset.
Function:
[] The largest negative offset value that can be
programmed into 28-81 dP0 Offset without
exceeding the minimum reference value
programmed into 3-02 Minimum Reference. The
value is rounded to the nearest larger integer.
If a numerically larger value is entered the sum
of the offset and the setpoint is clipped to the
value of 3-02 Minimum Reference.
Function:
[] The largest positive offset value that can be
programmed into 28-81 dP0 Offset without
exceeding the maximum reference value
programmed into 3-03 Maximum Reference. The
value is rounded to the nearest smaller integer.
If a numerically larger value is entered the sum
of the offset and the setpoint is clipped to the
value of 3-03 Maximum Reference.
MG16H102 - VLT
®
VLT Refrigeration Drive Programming Guide
28-90 injection_on
Range:
0 [0 - 1] This parameter is read by LON Bus to convey the
*
28-91 Delayed Compressor Start
Range:
0 [0 -
*
1]
®
is a registered Danfoss trademark
Function:
Injection ON/OFF signal to the case controllers. If
this parameter value is 0 then it means Injection
OFF, if the parameter has a value 1 then it means
Injection ON.
Function:
If this parameter is set to 1, Delayed start of
compressor is controlled by Injection Control feature
in association with 1-71 Start Delay. If it is set to 0
then Delayed start of compressor is controlled only by
1-71 Start Delay. If 28-91 Delayed Compressor Start set
to 1 and injection is OFF; start of compressor is
delayed by amount of time set in 1-71 Start Delay. If
28-91 Delayed Compressor Start set to1 and injection is
ON then start of compressor is not delayed. If 28-91 is
set to 0, Injection Controller feature will not interfere
in delaying start of compressor. Delayed start of
compressor is not active during Short Cycle
protection.