Trane TR200 Series Programming Manual page 197

Parameter Description
20-8* PID Basic Settings
This parameter group is used to configure the basic operation of the frequency converter's PID Controller, in-
cluding how it responds to a feedback that is above or below the setpoint, the speed at which it first starts
functioning, and when it will indicate that the system has reached the setpoint.
20-81 PID Normal/ Inverse Control
Option:
[0] * Normal
[1] Inverse
20-82 PID Start Speed [RPM]
Range:
0 RPM* [0 - par. 4-13 RPM]
20-83 PID Start Speed [Hz]
Range:
0 Hz* [0.0 - par. 4-14 Hz]
20-84 On Reference Bandwidth
Range:
5 %* [0 - 200 %]
196
Function:
Normal
[0] causes the frequency converter's output frequency to de-
crease when the feedback is greater than the setpoint reference. This is
common for pressure-controlled supply fan and pump applications.
Inverse
[1] causes the frequency converter's output frequency to increase
when the feedback is greater than the setpoint reference. This is common
for temperature-controlled cooling applications, such as cooling towers.
Function:
When the frequency converter is first started, it initially ramps up to this
output speed in Open Loop Mode, following the active Ramp Up Time.
When the output speed programmed here is reached, the frequency
converter will automatically switch to Closed Loop Mode and the PID
Controller will begin to function. This is useful in applications in which
the driven load must first quickly accelerate to a minimum speed when
it is started.
NOTE: This parameter will only be visible if par.0-02
is set to [0], RPM.
Function:
When the frequency converter is first started, it initially ramps up to this
output frequency in Open Loop Mode, following the active Ramp Up
Time. When the output frequency programmed here is reached, the fre-
quency converter will automatically switch to Closed Loop Mode and the
PID Controller will begin to function. This is useful in applications in
which the driven load must first quickly accelerate to a minimum speed
when it is started.
NOTE: This parameter will only be visible if par.0-02
is set to [1], Hz.
Function:
When the difference between the feedback and the setpoint reference is
less than the value of this parameter, the frequency converter's display
will show "Run on Reference". This status can be communicated exter-
nally by programming the function of a digital output for
ence/No Warning
[8]. In addition, for serial communications, the On
Reference status bit of the frequency converter's Status Word will be
high (1).
On Reference Bandwidth
The
reference.
Motor Speed Unit
Motor Speed Unit
is calculated as a percentage of the setpoint
TR200 Programming Guide
Run on Refer-