Product Brochure

ECM
Motor
T2
or Neutral
!
If d f i li d h VAC
CAUTION
!
T1
AC Line Voltage
From Contactor
(+) Signal
(-) GND
24 VAC
VDC or mA
Connect “GO” to motor enable pin
(if required)
-
+
G
792-ECM Motor Speed Controller
The 792-ECM (Vma) motor speed controller is designed to
provide both continuously variable and/or manually adjustable
proportional speed control for all sizes and voltages of ECM
DC Brushless motors. The
792-ECM (VmA) controller
also includes an output to
“enable” operation of ECM
motors that require such a
signal for operation.
Continuously variable speed
control is accomplished via
2-10VDC or 4-20mA input
signal to the control. This
controller provides a linear
increase of the output as the
input signal increases over
the 2-10VDC or 4-20mA
span.
Manual Speed Control is accomplished by adjusting the
control pot in the clock-wise direction to increase motor
speed. Adjusting the pot in the counter clock-wise direction
will slow down and eventually stop the motor as the PWM
signal is removed.
The two control methods may be used together by manually
setting a minimum speed for the motor to always maintain,
regardless of input signal. When the input signal exceeds the
level set manually, full variable speed control is resumed as
long as the input is above the manually set level.
The 792-ECM is line voltage independent and requires only a
24VAC supply. This unit is circuit board on standoffs for
mounting directly to control panel surfaces.
Variable speed control is accomplished via a Pulse Width
Modulated (PWM) output signal. The PWM signal operates at
a nominal 13.5VDC at 80 Hz and is capable of sourcing up to
5mA drive current to drive a single motor.
Specifications:
• Motor speed: Continuously variable/manually adjustable/Off
• Input voltage: 24VAC (+20%/-10%)
• Input signal:
º DC Volts: 2-10VDC
n Input impedance: 10,000 Ohms Min.
º DC milliAmps: 4-20mA DC
n Input impedance: 500 Ohms
• Output: 0% to 100% PWM @ 80Hz
º 13.5VDC, 5mA (max.)
º Max wire length (twisted pair) 100 ft.
• Operating ambient: 32°F to 120°F
• Humidity: 95% non-condensing
• Dimensions: (L x W x H): 2.50” x 3.00” x 1.25
MARS NO. DESCRIPTION
MARS
PACK
08033 ECM Motor Variable Speed Controller 1
If a ground reference is applied to the 24VAC
power source, the "grounded" lead must be
connected to terminal 24V COM ONLY.
CAUTION
!
Manual Motor Speed Controllers
MARS 08036 and MARS 08037
manual motor speed controllers
are designed to provide
proportional speed control for
single phase shaded pole or
permanent split capacitor (open
frame) motors. These modules
may be used for any nominal
voltage between 120 and 277
volts. The design is for direct
connected propeller (blade) or
blower (squirrel cage) fan type
applications, but may be
applicable to other non-air
moving type motor drive
requirements typical of pumps,
etc. Typical performance will
provide speed adjustment approaching stall with a separate minimum
speed limit. Minimum speed setting may be limited depending upon
the ventilating characteristics of the motor. The minimum speed limit
sets minimum RPM preventing motor stall. Minimum Speed varies with
motor loading.
Specifications:
• Minimum Speed: Field Adjustable
• Humidity: Condensation Free
• Operating Ambient Temperature: 0°C- 60° C
• UL Recognized
08036
08037
MARS NO. AMPS VOLTS
MARS
PACK
08036 5 120 through 277 1
08037 10 120 through 277 1
Motor Accessories
M–51M–51
®
marsdelivers.com
ACCESSORIES
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