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NEMA
4X rated polycarbonate enclosure
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| SmartFan
AC-VX is a digital fan speed control designed for HVAC applications.
Automatic detection and adjustment for power factor permits
efficient control of a wide range of single phase PSC and shaded
pole fans with current ratings up to 8.0 Amps. It accepts 115
or 230 VAC (50/60 Hz) supply voltages. AC-VX proportionally
controls fan speed over a range of about 4 to 1, as well as
turns the fan off and on based on a control signal input. The
control signal can be from a 20 mA current loop, 0 to 5 VDC,
0 to 10 VDC or P10 remote temperature sensor input. Because
the control signal is electrically isolated from the fan, it
can be derived from nearly any source. No low voltage power
source is required. It is available with or without a NEMA 4X-rated
polycarbonate enclosure. |
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Features
- Under low speed
conditions, acoustical noise and energy usage are substantially
reduced
- Automatically
detects and adjusts for power factor
- Compensates
for variations in line voltage
- Does not require
a separate low voltage power source
- Compatible with
single phase PSC or shaded pole-motors that are phase (TRIAC)
controllable
- All connections
through terminal blocks
- Control signal
can be used to switch the fans on and off
- Fan speed is
proportional to control signal
- Jumpers allow
user selectable settings of:
- Full Speed
Temp.
- Temp. Differential
- Idle or
off
- Idle Speed
- Includes RFI
noise filter
- CE and UL approvals
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| SPECIFICATIONS |
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Part
Number
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Power
Source (50/60 Hz)
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Maximum
KVA
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Maximum Current to Fans 104°F(40°C) Still
Air
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Control
Signals
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Enclosure
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180V800
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115VAC
± 15%
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230VAC
± 15%
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8.0
Amps
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0-5
V
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0-10
V
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0-20
mA
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P10
Sensor
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180V800E
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115VAC
± 15%
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230VAC
± 15%
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8.0
Amps
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0-5
V
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0-10
V
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0-20
mA
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P10
Sensor
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AC-VX
mounted in a NEMA 4X polycarbonate enclosure with liquid
tight strain reliefs
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| U.S.
Patents 4,659,920, 4,722,699 and 5,364,026 and patent pending
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| INSTALLATION |
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| A complete
user manual is available in Acrobat PDF format. Click here:
AC-VX Manual |
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Mounting
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| Mounting
P/N 180V800 (AC-VX board only) To satisfy safety agency
requirements (UL, CSA, IEC, VDE, CE), allow 1/4” (6.3 mm) between
the circuit board and chassis ground and 5/16” (8mm) to any
uninsulated secondary circuits. |
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| P/N
180V800E (AC-VX in enclosure) Refer to Figure 1 for mounting
dimensions. P/N 180V800E includes the AC-VX board mounted in
a NEMA 4X rated polycarbonate enclosure. Electrical connections
are made through three bottom entry holes fitted with liquid
tight strain reliefs. There is a separate connection for line
power, fan power, and control signal. Mount the enclosure with
the strain reliefs tightened and pointing down. |
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| Line
Power Fan Voltage |
| Connect
line power and fan power as shown in Figure 2. A line power
disconnect switch is recommended to allow isolation of the AC-VX
from power mains. For 180V800E units, connect line power and
fan power through the two separate ports provided. |
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| Control
Signal Input |
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a control signal source as shown in Figure 2 to one of three
inputs. All control signal inputs at terminal block TB2 are
optically isolated from line power. For 180V800E units, control
signal wiring should enter the enclosure through the control
signal port. |
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| Temperature
Sensor |
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temperature sensor input, also optically isolated from line
power, is located at the two terminals on TB2 labeled SENSE.
There is no polarity consideration when connecting the sensor.
The input is compatible with the P10 sensor shown on Sensors
page. |
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| CONNECTIONS |
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Connection
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Function
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Type
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TB1:B
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TB1:W
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TB1:G
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TB1:G
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TB1:FW
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TB1:FB
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Line
Power
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Line
Neutral
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Circuit
Ground
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Circuit
Ground
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Fan
Neutral
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Fan
Power
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14
AWG Wire ready, #6 Raised Screw Terminal Blocks
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TB2:COM
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TB2:20mA
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TB2:10V
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TB2:5V
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TB2:SENSE
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TB2:SENSE
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Control
Signal Common
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20
mA Control Signal Input
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10
VDC Control Signal Input
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5
VDC Control Signal Input
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Temperature
Sensor Input
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Temperature
Sensor Input
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14-24
AWG Screw Clamp
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| OPERATION |
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Caution
- Not all PSC
and shaded pole fans are phase (TRIAC) controllable. The
fan manufacturer should confirm that the fan is designed
to permit this type of control.
- Some fans may
draw more current at reduced speed than at full speed. The
8.0 Amp current rating of the AC-VX should not be exceeded
at any speed.
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| Modes
of Operation |
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The AC-VX has two
modes of operation:
1) Fan Speed
Proportional to Analog Control Signal When used in this
mode of operation, the AC-VX controls fan speed in proportion
to a 0-20 mADC, 0-5 VDC, or 0-10 VDC analog control signal.
Idle speed ON/OFF and the idle speed voltage can be adjusted
in this mode.
2) Fan Speed
Proportional to Temperature Sensor Input When used in
this mode of operation, the AC-VX controls fan speed in proportion
to temperature as sensed by a thermistor (P10). The following
parameters can be adjusted using the four jumpers located
on the AC-VX: Idle speed, Idle speed ON/OFF, full speed temperature,
and differential temperature.
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| Powering
the Fans ON/OFF When the fan idle is set to OFF using jumper
J3, the fan voltage drops to zero when the control signal commands
the output to go below the idle speed set-point. The fan voltage
will come on slightly above (7%) the idle speed OFF point. This
is a built in hysteresis feature. Example: If header J3 is set
to OFF and header J2 is set to MID, the fan voltage will drop
to zero below a 35% control signal and come back on when a control
signal above 42% is applied. |
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| Power
Factor Adjustment The power factor of the connected fan
load is sensed at power up. This information is used by the
microcontroller to adjust for optimum fan speed range. As a
result, two fan types will have different voltage vs. control
input profiles if their power factors are significantly different.
For instance, the voltage range available for a high power factor
fan will be larger than a low power factor fan. |
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| Settings
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| Diff
°F (J1) Use this jumper to set the temperature difference
between full speed and idle speed. The setting is only applicable
to applications using the temperature sensor input (SENSE).
The three temperature differential settings are 5, 10, and 15°F.
The factory setting is 10°F. |
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| Idle
Speed (J2) Use this jumper to set the lowest fan voltage
applied to the fan when the idle speed (J3) is set to ON. With
idle speed set to OFF, this jumper sets the point at which the
voltage applied to the fans shuts off. The three positions in
order of increasing idle voltage are LOW, MID, and HIGH. The
factory setting is MID. |
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| ON/OFF
(J3) Use this jumper to determine if the fan voltage should
shut off below the idle speed set by header J2. The factory
setting is ON. |
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| Full
Speed °F (J4) Use this jumper to set the temperature above
which the maximum voltage is applied to the fan. The setting
is only applicable to applications using the temperature sensor
input (SENSE). The four temperature settings are 75, 80, 85,
and 90°F. The factory setting is 80°F. |
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| Fusing
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field replaceable line fuse is mounted in all AC-VX units. The
fuse is a snap in type rated 15 Amps, 250 VAC and is equivalent
to Littelfuse No. 314-015. |
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| The
following graphs summarize the AC-VX performance with a typical
permanently split capacitor type fan at 115 VAC line voltage. |
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Figure
3 Fan RMS voltage vs. percentage of control signal for
all idle voltage (J2) with Idle (J3) = ON.
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Figure
4 Fan RMS voltage vs. temperature input for all differential
temperature settings (J1) and all idle speed settings (J2)
with Idle (J3) = ON. Note: The variable Tc in the above graph
is the full speed temperature as set by the header J4. Three
full speed temperature settings are available.
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