Download 708-BVmA and CVmA PD 06-02 Rev A.qxd

Hoffman |Controls
708-BVmA and 708-CVmA Series
Electronic Fan Speed Controllers
Product Data
Application
The variable speed Controller is used for adjustment of
motor RPM within a limited range of operating temperatures that assure adequate ventilation of the motor. Motors
should always be evaluated at minimum reduced speed at
the highest ambient operating temperature anticipated. The
Controller is designed for air moving applications using
squirrel cage or propeller type fans.
However, it may be suitable for other, non air-moving,
direct drive motor applications. Motors should be open,
drip-proof types.
708-BVmA Series
Electronic Fan Speed Controller
The Controller heat sink is designed to operate in
ambient temperatures up to 120° F. The component
housing should be enclosed inside an electrical box or
wiring compartment. The Controllers should not be
mounted in an airtight, unventilated panel or on a heat
producing surface.
The Controller should be mounted to electrically conductive material and/or be electrically grounded.
Description
Squirrel Cage
The NEW 708-BVmA and 708-CVmA Series electronic
Controllers are designed to provide proportional speed
control of single phase motors for variable air volume applications. The Controller may be used with shaded pole or
permanent split capacitor type motors from 120V to 480VAC.
Propeller
(blade type)
The Controller phase proportions (modulates) the single
phase power to regulate RPM as determined by a 2 – 10V DC
or 4 – 20mA DC input signal provided by the customer.
The 708-BVmA and 708-CVmA Series Controllers provide
independent “maximum” and “minimum” speed limit
adjustments. Also included, a separate continuous
minimum speed or “drop out” function at minimum input.
Variable Air Volume controls offer the optimum flow of
air for the prevailing loads encountered. VAV provides
maximum flow for effectively accomplishing sensible heat
loads at design conditions. Minimum flow occurs when
lighter loads are encountered. In the cooling mode, an
added benefit can be obtained. As air flow decreases with
load, additional latent cooling capacity is utilized to
provide extra dehumidification. This function is most
beneficial when light loads are experienced and increased
dehumidification is required.
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Features and Benefits
• Applicable for shaded pole or permanent split
capacitor motors.
• Multi-voltage applications.
• Minimum/Maximum speed adjustments.
• Motor cut-out adjustment.
• Optional 265-PI Interface (Proportional Integration).
–
Shown in Product Illustration.
708-BVmA & 708-CVmA Product Data
Specifications
Full
Speed
Line
15% ≈
24VAC
Frequency
60 Hz
Voltage, Line (nominal)
120 – 480VAC
Current (maximum)
708-BVmA
708-CVmA
Recommended Operating Range
(Full Speed to 50% of 90%)
Good Speed Regulation
10 Amps
15 Amps
To
rq
ue
1.0 VA
90%
Motor Speed (RPM)
Power
≈ 85%
Volts
Voltage, Input (nominal)
RMS Voltage Reduction
effects ≈10% RPM Reduction
nt
re
ur
C
50%
Potential Operating Range
(50% to 30% of full speed)
Good Speed Regulation
Possible
≈ 30%
Not Recommended Operating Range
Motor Typically Stalls
Input Signals
DC Volts
Load Impeadance
DC milliAmps
Load
2 – 10V DC
10,000 Ohms Min.
4 – 20 mA DC
500 Ohms
Stall
≈ 30%
Current
Torque
Min.
Operating Ambient
FLA
≈ 135%
of FLA
Max.
32°F to 120°F
Humidity
Typical Motor Volts / RPM vs. Current / Torque
Non-condensing
Dimensions (L x W x H)
5.52” x 4.15” x 3.15”
4 – 20mA DC
Volts / mA inputs when
optional 265-PI Interface
is not installed
2 – 10VDC
!
24V AC
J1
J9
J8
265-PI
Interface
RA
J4
GND
24V AC
PI
H1
DA
Grounded
secondary
(if applicable)
MAX
TP1
Jumper either
RA or DA
as applicable
TB3
YEL/4–20
R6
BLK / GND
AS
RED / 2–10
R4
TB2
TIME CONST ADJ.
+12
SETPOINT ADJ.
TB1
OS
J2
R17
CUTOFF
CAUTION
MIN
!
mA in
J3
R28
R23
Transformer primary
must be connected to
same power line as
motor / Controller (L1 – L2).
Vin
4 – 20mA DC
J2
0 – 10V DC
GND
TP1
J1
Transducer / Aux
Equipment Power
LINE
+12V
LOAD
P2 P1
J4
J6
J7
J3
LOAD
L1
Motor
120V AC
208V AC
230V AC
277V AC
460V AC
480VAC
LINE
L2 or Neutral
708-BVmA and 708-CVmA Series Product Illustration
with Optional 265-PI Interface Installed
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
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Form: 708-BVmA/708-CVmA 0602-020, Rev. A