Trane TR170 - Page 92

Illustration 3.17 Flow Compensation Set-up
There are 2 methods which can be employed, depending
on whether the speed at system design working point is
known.
Parameter used
Speed at design point
KNOWN
Speed at design point
UNKNOWN
Parameter 22-80 Flow Compensation ++
Parameter 22-81 Square-linear Curve Approximation ++
Parameter 22-82 Work Point Calculation ++
Parameter 22-84 Speed at No-Flow [Hz] ++
Parameter 22-86 Speed at Design Point [Hz] +-
Parameter 22-87 Pressure at No-Flow Speed ++
Parameter 22-88 Pressure at Rated Speed -+
Parameter 22-89 Flow at Design Point -+
Parameter 22-90 Flow at Rated Speed -+
Table 3.12 Speed at Design Point Known/Unknown
22-80 Flow Compensation
Option: Function:
[0] * Disabled Disable ow compensation of setpoint.
[1] Enabled Enable ow compensation of setpoint.
22-81 Square-linear Curve Approximation
Range: Function:
100 % * [0 - 100 %] Adjusts shape of control curve. 0% =
straight line, 100% = maximum parabola.
22-82 Work Point Calculation
Option: Function:
[0] * Disabled Disable calculation of working point at rated
speed.
[1] Enabled Enable calculation of working point at rated
speed.
22-84 Speed at No-Flow [Hz]
Range: Function:
Size related * [ 0 - 50.0 Hz] Set the motor speed in Hz at which
ow
is 0 and minimum pressure is
achieved.
22-86 Speed at Design Point [Hz]
Range: Function:
Size related * [ 0.0 - 50.0 Hz] Set the motor speed in Hz at
which system design working
point is achieved.
22-87 Pressure at No-Flow Speed
Range: Function:
0 * [ 0 - 4999.000 ] Set the pressure value corresponding to
speed at no ow.
22-88 Pressure at Rated Speed
Range: Function:
4999.000 * [ 0 - 4999.000 ] Set the pressure value
corresponding to pressure at rated
speed.
22-89 Flow at Design Point
Range: Function:
0 * [0 - 4999.000 ] Set the ow value corresponding to ow at
design point.
Parameters Programming Guide
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