ng power, so
there is less energy drain on the power source and less heat to dissipate.


Unlike other solenoids that loose pull force from the heat increases and wiring
losses, the Equalizer automatically compensates for these factors. Equalizer s
performance is virtually unaffected by the fluctuations in voltage and temperature
that are inevitable with mobile and other equipment


This pull-type solenoid eliminates the performance guesswork by eliminating the
variations normally associated with voltage and temperature fluctuations.
Trombetta s design uses PMW to precisely control coil power by changing the duty
cycle (coil on time/ (on + off time)) in response to changing voltage and
temperature conditions. The modulation affects pulse duration, which is changed
in response to the information being interpreted by the control s microprocessor.
The control s micro-code monitors voltage and temperature during each cycle to
predetermine the on and off time ratio (duty cycle) for the next cycle.

Because the Equalizer uses a consistent amount of power under broadly varying
conditions, it eliminates most of the headaches usually encountered in selecting a
protective fuse that will adequately protect equipment without nuisance failures,
for example, when the solenoid is cold.

The Equalizer operates at ambient temperatures between -40 to 105 C.
Continuous operation in ambient temperatures as high as 105 C still produces the
rated force of 12 lb, even with voltage at the solenoid as low as 10 V. With
ambient temperatures lower than 105 C, the Equalizer will produce its rated force
at voltages even less than 10 V. The typical Equalizer pull force is 12 lb minimum
at 10-15 V, even when operating continuously at 105 C. The hold force is 25 lb at
6 VDC and above when operating through the full temperature range.
The Equalizer uses a three-pin Packard Electric Metri-Pack series 150 male
receptacle connection that is integral to the solenoid. Two wires are for the typical
battery positive and ground carrying the main power to the solenoid. The third
wire is a command signal line. The solenoid is switched on by switching the control
line to battery plus. The control line draws only a few milliamps of current, so the
control wiring can be light-gage wire and the switching device can be a low-
current switch. The Equalizer maintains its performance even if the operator s
point of control is a significant distance from the solenoid, as is often the case with
mobile equipment such as aerial lifts. High-current wiring can be run the most
direct and shortest route from battery to the solenoid. Only the low-current
command signal needs to be wired to the operator s station.

Integrating the control module into the solenoid keeps the size of the solenoid
down to a minimum, so the unit can fit in a relatively small envelope. The
Equalizer is available in convenient side- or flange-mount configurations.

Trombetta will customize the Equalizer to suit special requirements. Options
include pull-in time duration, force, minimum voltage, thermal shut down, and
current modifications. Potential applications include remote throttle control,
equipment with distributed actuation of control; differential locks; and distributed
stop, release, lock, and unlock capabilities.

Equalizer s full voltage range is from six to 15 VDC when operating continuously,
but can increase to 16 VDC for 30 minutes or less. Its ratings also allow it to be
subject to 24 V during jump starts of five minutes or less. Hold force is25 lb at six
VDC. Stroke length is 1.0 inch. The product s maximum duty cycle is 10 cycles in 1
minute.

Based in Menomonee Falls, Wisconsin, Trombetta has been a leading
manufacturer of industrial work solenoids, DC contactors, electronic controls and
engineering services for over seventy years.

For more information call (262) 251-5454 or visit
www.Trombetta.com


Media Contact:
Stacy Wessell, Marketing Coordinator
P: 1.262.251.5454
F: 262.251.5757
E: swessell@trombetta.com