Toshiba Q9 HVAC Instruction Manual

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Pressure
Transducer
Air Flow
Damper
Damper
Damper
Area in which constant
pressure is desired
4-20 mA Feedback
Q9 APPLICATION GUIDELINE 1.1
Process PID
Introduction
The built-in Process PID control of the Q9 can be used to maintain a constant process variable such
as flow, pressure, temperature, or level. In the example below, the Q9 is being used to vary the speed
of the motor/fan to maintain a constant static pressure in the ductwork. As the dampers on the output
side of the fan are opened, the static pressure in the system will begin to drop. The drive senses this
change in static pressure via a 4-20mA feedback signal and the drive will increase the speed of the
motor/fan to bring the static pressure to the desired level. Conversely, the drive will slow the
motor/fan down as the dampers close to compensate for the increase in pressure. The rate at which
the drive responds to changes in the feedback signal is adjustable via three parameters (Proportional
Gain, Integral Time, and Differential Time) and will need to be field-tuned.

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+
-
Pressure Transducer
(2-Wire)
P24 V/I CC IICC
4-20 mA
Connections
Depending on the type of transducer that is being used for process feedback, the wiring will be
different. The connection diagrams below show how to connect a 2-wire transducer and a 4-wire
transducer to the Q9.
2-Wire
When using a 2-wire transducer with a Toshiba drive, it is usually
powered from the P24 terminal (24 Vdc supply). The positive
terminal of the transducer is connected to P24 and the feedback
signal (4-20 mA) is connected from the negative terminal to the V/I
terminal.
Because the V/I terminal is an isolated analog input and the
transducer is powered from P24, the current loop will not be
complete. A jumper will need to be placed between CC and IICC
to make the V/I terminal non-isolated.
4-Wire
A 4-wire transducer is powered from an external source and does
not use the drive for power. Two of the wires will connect to the
external power source. The feedback signal will be connected
from the positive terminal of the transducer to the V/I terminal of
the drive. The return for the current loop will be connected from
the negative terminal of the transducer to the IICC terminal of the
drive.
Because the transducer is not being powered from the Q9, the V/I
terminal can remain isolated and there is no need to connect CC to
IICC.
Note:
When using a 4-20 mA signal as feedback into the V/I terminal, be
sure to set SW 301 to “I”.

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Programming
Below are the adjustable PID parameters and their default settings.
Direct
Access Parameter Name Range Default Setting
F359 PID Control Switching 0: PID Off 1: Process PID
2: Speed PID
0
F360 PID Feedback Signal Selection
0: Feedback Value = 0
1: V/I
2: RR
3: RX
4: RX2
5: Option V/I
6: PG Feedback
0
F361 PID Feedback Delay Filter 0.0 – 25.0 0.0
F362 PID Feedback Proportional (P) Gain 0.0 – 100.0 0.10
F363 PID Feedback Integral (I) Gain 0.01 – 100.00 0.10
F354 PID Deviation Upper Limit 0.00 – 60.0 Hz 60.00 Hz
F365 PID Deviation Lower Limit 0.00 – 60.00 Hz 60.00 Hz
F366 PID Feedback Differential (D) Gain 0.00 – 2.55 0.00
F367 Process Upper Limit Lower Limit – Upper Limit 60.00 Hz
F368 Process Lower Limit Lower Limit – Upper Limit 0.00 Hz
F369 PID Control Wait Time 0 – 2400 sec 0 sec
F370 PID Output Upper Limit Lower Limit – Upper Limit 60.00 Hz
F371 PID Output Lower Limit Lower Limit – Upper Limit 4.00 Hz
F372 Process Increasing Rate 0.1 – 600.0 sec 10.0 sec
F373 Process Decreasing Rate 0.1 – 600.0 sec 10.0 sec
Enabling Process PID Control (F359)
To operate the Q9 in Process PID mode, Parameter F359 (PID Control Switching) must be set to “1:
Process PID”.
PID Feedback Signal Selection (F360)
A feedback signal from a transducer needs to be sent to the drive in order for PID control to function
properly. The type of signal being used to measure the system variable determines what the value of
Parameter F360 should be set to. In most cases, the feedback signal from the transducer is a 4-20
mA signal and F360 should be set to “1: V/I”.

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Setting the Setpoint
The setpoint is adjusted according to whatever level is necessary to yield the desired process
variable setting. The setpoint will be entered as a frequency (Hz) value and not as the process
variable’s value (PSI, temperature, etc.). It is entered as a frequency because the setpoint is related
as a percentage of the feedback signal. For example, if the transducer’s measurement range is 0 to
300 PSI and the target is 150 PSI, the setpoint should be set at 50% of the Upper Limit Frequency. If
the Upper Limit Frequency is 60 Hz, the setpoint would be 30 Hz.
The setpoint is set by the commanded frequency. The frequency command is determined by the
Frequency Mode Selection 1 (F004). The settings for Frequency Mode Selection 1 can be seen
below.
Direct
Access Parameter Name Settings Default Setting
F004
Frequency Mode Selection 1
1: V/I
2: RR
3: RX
4: Panel Keypad
5: RS485 (2-wire)
6: RS485 (4-wire)
7: Communication Option Board
8: RX2
9: Option V/I
10: Up/Down Frequency
11: Pulse Input (option)
12: Pulse Input (motor CPU)
13: Binary/BCD Input (option)
2: RR
It is important not to set Frequency Mode Selection 1 (F004) the same as the PID Feedback Signal
Selection (F360) as this will change the setpoint as the process variable changes and will cause
unfavorable results. In most cases, the Frequency Mode is set from the Electronic Operator Interface
(EOI). Setting F004 to “4: Panel Keypad” will use the EOI to set the setpoint. However, the user may
use any of the settings listed above to set the setpoint.
Determining the Setpoint
The range of the transducer must be known to accurately calculate the setpoint. The following
equation is used to calculate the setpoint:
ASD Setpoint LimitUpper
mAatunitsmAatunits unitssetptdesired _ 4__20__ __ 











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The following example shows how to calculate the setpoint on a pressure control system with the
following transducer characteristics:
Pressure Transducer Range: 0-300 PSI
Transducer Output: 4-20 mA
Desired Pressure: 60 PSI
ASD Setpoint Hz
PSIPSIPSI 60 0300 60 








ASD Setpoint = 12 Hz
Examples:
Note: These values are starting point suggestions for tuning. They may or may not get the desired
result right away.

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Revision History
Rev. Date Written/Revised
By Approved By Description
1.1 6/23/2011 Joshua Austin Terry Voigt Formatting. Revised to incorporate document control
requirements.