Hoffman 709D-VmA Series User manual
709D-VmA and 709E-VmA Series
Electronic Fan Speed Controllers
Hoffman
|
Controls
Installation & Operating
Instructions
1
Introduction
The 709 Series of Electronic Fan Speed Controllers consists of two
models. These 2 models allow for the option of deriving power
for the control via an external 24 VAC transformer (provided
by customer), or directly from line and phase of the “onboard”
PCB mounted transformer. The 709D does not include the 24
VAC transformer. The 709E includes the transformer internally
connected to the line voltage.
Each of these models have the option of using a Hoffman Controls
Proportional Integration (PI) Interface plug-in PCB assembly.
This document contains instructions for establishing the electrical
connections for each of the 709 Series controllers’ four configura-
tions.
The 709E controller has sufficient VA (power) to drive the
optional Proportional Integration (PI) Interface plug in card and
one of the the following signal sources; a Hoffman Controls 203-
5(24)V Flow Transducer, a 203-6(24)P Pressure Transducer, or a
906VmA Thermostat. IMPORTANT: When using 709D series
controllers, select a transformer to meet the requirements of all the
components being used.
Initial Controller Installation
Motor Line Voltage Wiring (Figures 1 & 2)
Connect one side of the motor to the "LOAD" terminal on the
709D PCB. Connect the other side of the motor to L1.
Connect L2 or Neutral to the "LINE" terminal on the 709D PCB
assembly.
24 Volt Wiring (Figures 1&2)
Connect the primary side of the 24 VAC transformer to the same
L1 & L2 or Neutral as the motor.
The primary of this external 24 VAC transformer MUST BE THE
SAME PHASE that is supplying power to the motor.
Connect the leads of the 24 VAC transformer secondary to the
"24V IN" & adjacent "GND" terminals of the 709 PCB assembly.
The GND terminal allows for a grounded secondary of the 24 volt
transformer if required.
Do not share this AC GND with DC signal
sources, use a separate wire connection for dc signal ground.
Control Signals (Figure 1)
The 709D accepts industry standard 2-10 VDC or 4-20 ma input
signals. Connect the 2-10 VDC or 4-20 mA control signal and
it's GND reference to their respective terminal block locations.
There is a common signal GND shared by both VDC and mA.
PI Interface Option (Figure 2)
IMPORTANT: The PI Interface Option will replace the standard
2-10 VDC and 4-20 mA inputs on the 709D control. When using
this option the control signals are connected to their respective
terminals on the PI Interface PCB, not the 709 PCB terminals.
Insure that all power sources have been disconnected.
Remove longer top cover of 709D or E (with B or C suffix) model
controller by removing (4) self-tapping screws.
Secure the controller via the heat sink mounting tabs.
Connect the green wire to earth ground.
709D Wiring
Transformer Phasing
The model 709D Series Electronic Fan Speed Control requires an
external 24 VAC source.
This 24 VAC SOURCE MUST BE IN
PHASE with the line voltage being supplied to the motor
. Motor
line voltage and transformer primary MUST be on the same
phase/lines.
709E Wiring
Transformer Phasing
The model 709E Electronic Fan Speed Control contains an inter-
nal transformer to provide the required 24 VAC that is "in phase"
when the speed control is required to function.
Motor Wiring (Figures 3 & 4)
Connect one side of the motor to the "LOAD" terminal on the
709E PCB. Connect the other side of the motor to L1.
Power Supply (Figures 3 & 4)
Connect L2 or Neutral to the "LINE" terminal on the 709E
PCB. Connect L1 to the 120 VAC or 208-240 VAC terminal as is
appropriate for the voltage required.
Control Signals (Figure 3
)
The 709E accepts industry standard 2-10 VDC or 4-20 mA input
signals. Connect the 2-10 VDC or 4-20 mA control signal to
their respective terminal block.
There is a common signal GND shared by both VDC and mA.
PI Interface Option (Figure 4
)
IMPORTANT: The PI Interface Option will replace the standard
2-10 VDC and 4-20 mA inputs on the 709E control. When using
this option the control signals are connected to their respective
terminals on the PI interface PCB, not the 709 PCB terminals.
PI Interface Options
The 709 series of controllers have an available PI Interface option.
The PI Interface will allow for two modes of fan speed control in
relation to a setpoint.
In the Direct Acting or "DA" mode, the PI Interface does not
provide an input to the 709 series control until a control signal has
exceeded the setpoint level.
In the Reverse Acting or "RA" mode, The PI interface will contin-
uously provide an input to the 709 series control in an attempt to
maintain a control signal at the setpoint level.
Refer to the Hoffman Controls PI Interface Product Data Sheets,
PI Interface Installation & Operation Instructions, or Application
Notes literature for complete details on the operation of the
optional PI Interface board.
2
Controller Setup
Initial Potentiometer Settings
• Cutoff Pot at full ccw (minimum) position.
• Cal Pot at full ccw (minimum) position.
• Minimum Speed Pot at approximately center position.
• Maximum Speed Pot at approximately center position.
Note: If PI is installed, ensure mode select is in “RA” position with
the set point pot adjusted to full ccw position.
CALIBRATION PROCEDURE
1. Disconnect 2-10 VDC or 4-20 mA input from 709 controller.
2. Power up motor & 709 controller.
3. Adjust Cal Pot R5 (cw rotation) until 10.0 VDC is read on
TP1.
4. Adjust the Maximum Speed Pot R13 (cw or ccw as required) to
achieve desired maximum motor voltage and RPM.
a) HCC recommends that a maximum motor voltage setting
equal to line voltage minus 10% be used to obtain the most
linear response for use of the full rpm requirement.
For a 120 VAC motor adjust for 108 VAC across motor.
For a 240 VAC motor adjust for 216 VAC across motor.
b) A correctly calibrated motor will yield the most linear
response curve of motor performance.
c) A motor voltage setting equal to line voltage minus 10 VAC is
the maximum level recommended at full speed.
5. Adjust Cal Pot R5 (ccw rotation) until 2.0 VDC is read on
TP1. The motor
may
de-energize at this time until your
may de-energize at this time until your may
minimum speed has been properly set.
6. Adjust the Minimum Speed Pot R15 (cw or ccw as required) to
achieve desired minimum motor voltage and RPM.
a) HCC recommends not less than 200 rpm for ball bearing,
and 400 rpm for sleeve bearing motors.
b) The Minimum Speed Pot and Maximum Speed Pot will
interact with each other, repeat steps 3 through 6 as required.
7. For a continuous flow application, no further adjustment is
required. Stop the calibration procedure at this point. Leave the
Cal Pot R5 in its current position at 2.0 VDC.
a) The motor will run at this speed until the external input
signal indicates demand, forcing a change in motor speed.
b) For a switching application that requires the control to cutoff,
proceed with calibration steps 8 & 9 below.
8. Adjust cutoff pot R11 (cw rotation) slowly until motor de-
energizes.
a) This sets the point a motor will “turn off” as the input signal
decreases to the set point (currently simulated by the Cal Pot
setting). The motor will turn ON again at approximately this
cutoff level + 0.3 VDC.
b) The minimum required cutoff input level is 2.0 VDC.
The maximum available cutoff input level is 6.0 VDC.
9. Adjust Cal Pot R5 back to full ccw position. This will allow the
unit to run the fan in a "cutoff" mode which de-energizes the
motor when the input signal indicates no demand.
RE-CALIBRATION COMPLETED
Note: Important
- verify that PI mode jumper is returned to
Note: Important - verify that PI mode jumper is returned to Note: Important
proper position for your application.
Final Controller Installation
De-energize all system components.
Insure all wiring and connections are in compliance with appli-
cable state and local codes.
Reconnect the signal inputs to the controller, or the PI interface
card, if used.
Re-install long top cover, securing it with (4) self-tapping screws.
Installation Completed
When shipped from the factory all 709 series controls have
received the following standard calibration.
• The minimum motor speed setting is adjusted to approximately
400 RPM for a sleeve bearing motor.
• The maximum motor speed setting is adjusted to provide the
motor with approximately line voltage minus 10% as full speed.
• The 709 Series control has a "cutoff" set to de-energize the
motor when the DC input to the control drops below a 2 volt
level.
• Models equipped with a PI Interface have the PI Interface
configured for "DA" operation by default.
These setting may be adequate for most installations. If it is deter-
mined that a re-calibration is required due to the particulars of
the installation, follow all steps of the re-calibration procedure as
listed in the "Re-Calibration Procedure" section below.
Test Point (TP1) Measurements
Monitor TP1 of the 709series control with respect to circuit
ground using a DVM. The Cal Pot voltage used during calibration
(to simulate a 2-10 VDC input) is monitored here.
Motor Volts
Measurements
It is prefer
able to calibrate the control while monitoring
voltage
present across the
motor windings.
Re-Calibration Procedure
Speed Controls
When shipped from the factory all 709 Series controls are config-
ured to de-energize the motor when the dc input level falls below
2.0 VDC or 4 mA. A maximum speed setting of line voltage less
10% is also configured. Performance may be modified by calibrat-
ing the following control potentiometers.
POTENTIOMETER DEFINITIONS
Cal Pot R5
Used to simulate a 2-10 VDC input internally to the 709 Series
control. (For mA calibration values, multiply VDC by 2)
Cutoff Pot R11
Used to set a given input level that causes the control to "turn off"
the motor when the input signal has dropped below this level.
Maximum Speed Pot R13
Used to adjust the maximum motor speed when the full input
signal (10 VDC or 20 mA) level is applied.
Minimum Speed Pot R15
Used to adjust the minimum motor speed when the input signal
level of 2 VDC or 4 mA is applied.
3
709D-VmA(PI) Wiring Diagram
Figure 2
709D-VmA Wiring Diagram
Figure 1
709D-VmA Series
709D-VmA Series
709E-VmA Series
Hoffman
|
Controls
2463 Merrell Road, Dallas, Texas 75229 • Phone: (972) 243-7425 • Fax: (972) 247-8674 • Toll Free: 1-888-HCC-1190
www.hoffmancontrols.com Form: 173-0236-000 Rev A
4
www.hoffmancontrols.com Form: 173-0236-000 Rev A
4
www.hoffmancontrols.com Form: 173-0236-000 Rev A
709E-VmA(PI) Wiring Diagram
Figure 4
709E-VmA Series
709E-VmA Wiring Diagram
709E-VmA Wiring Diagram
Figure 3
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1
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