Polyspede

Our legendary OC2 series has been revamped with improved features and was launched in June 2002.
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OC2B is an open/closed chassis motor control that has been designed as building block solid state regulated power unit. OC2B uses state of the art control circuitry which can be used by itself, by wiring in the provided speed potentiometer as a straightforward speed regulated control or can be incorporated into much more sophisticated system designs contactor operation, external speed programming and tach feedback etc.

Speed Activated Relay

The Polyspede Speed Activated Relay (SAR) is an adjustable, voltage-sensitive relay. When provided with an input signal from a tachometer generator or motor control, the SAR can be adjusted to activate or release at a predetermined signal voltage level.
The board-mounted or optional external SET potentiometer is used to calibrate the voltage level at which the relay is activated.

The board-mounted differential potentiometer adjusts the difference between the pickup and dropout voltages.

The SAR can be used to activate an electrical device such as a motor, solenoid, clutch or brake, based on the line speed of a system.

It can also serve as safety device to sound an alarm, shut down a machine or interlock electrical functions.

Listed below is related application and ordering information for Polyspede's Speed Activated Relay.

Holding Brake

The brake is used to lock the shaft when the motor is not being driven. The SAR monitors the armature voltage to the motor. When the voltage rises from zero to a preset low level, the SAR releases the brake and the motor ramps up to speed. When armature voltage is reduced to near zero, the SAR sets the brake to hold the motor.

How to Order E1477-AA, Range X

Where:



E1477	is for Speed Activated Relay
AA	is an assembly number form Table 2 (below)
x	is a range number from Table 1 (below)

Table 1

Range X	R 812 Value	Adjustment Range AC or DC Volts	Max Allowable Input Volts RMS
1	Jumper	1.1 to 11	85
2	22 K	1.4 to 21	170
3	68 K	2.2 to 43	230
4	180 K	2.9 to 96	280
5	470 K	8.4 to 240	280

Other ranges are available by special order.

Table 2

Assembly	C603 Value	Used With	Release Time
-01	33.0 MFD	4 Pole, AC Tach	.35 sec
-02	10.0 MFD	14 Pole, AC Tach	.15 sec
-03	4.7 MFD	20 Pole, AC Tach. DC Tach, or Armature Voltage Sensing	.08 sec

Volts/Hertz, Sensorless
Vector and Flux Vector
drives ranging
from 1/4 to 200 HP.

Non Regenerative
and Regenerative
drives from 1/6
to 500 HP.

AC motors from Baldor,
AO Smith, Lincoln,
Marathon and Reliance.

DC motors from Baldor
and AO Smith.