PRS11011【PDF 1/4 页】SPEED SWITCH 115AC 10-100HZ

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Bulletin No. PRS1-H

Drawing No. LP0026

Released 8/05

Tel +1 (717) 767-6511

Fax +1 (717) 764-0839

www.redlion.net

MODEL PRS1 - PLUG-IN SPEED SWITCH

5 RANGES, FROM 0.1 Hz to 10 KHz

OVER-SPEED, UNDER-SPEED, OR ZERO-SPEED DETECTION

4 OPERATING MODES

REPEATABILITY TO 1/2% OF MAX. RANGE

LED RELAY “ON” INDICATOR

PROGRAMMABLE INPUT CIRCUIT ACCEPTS OUTPUTS FROM

A VARIETY OF SENSORS

DESCRIPTION

The PRS1 is a versatile, reliable and economical solution to most machine

speed switching problems. It is not affected by overspeeding and will operate in

either direction of rotation.

The heart of the PRS1 is a solid-state CMOS logic circuit, that continuously

measures the elapsed time between successive trailing edges (negative going) of

an incoming pulse train or waveform. It compares this time with an adjustable

set-point reference and determines if the period of the waveform is longer

(underspeed) or shorter (overspeed) than the set-point reference.

The internal relay is energized during “normal” operation and can be set to

de-energize on either under or overspeed by a programming switch. The unit

can be connected for simple over or underspeed detection or for latch/trip-off

operation in a machine STOP/START circuit.

The PRS1 features built-in hysteresis (differential between pick-up and drop-

out) of 5% of set-point speed. This prevents the output relay from chattering

when operating at or near the set-point speed. The set-point control is a 20-turn

screwdriver adjustment accessible at the top of the unit with a 10:1 adjustment

range. An LED indicates when the relay is energized. A built-in +12 VDC

regulated power supply, furnished power for the internal circuit and for external

sensor excitation.

The plug-in module mates with a heavy duty, CSA approved base mounting

socket with pressure clamp screw terminals that accept stripped wires without

lugs. Closed back construction allows mounting directly on metal panel without

an insulation barrier.

SPECIFICATIONS

1. PRIMARY SUPPLY VOLTAGE: Available for 115 or 230 VAC ±10%,

50/60 Hz; 2.5 VA (See Ordering Information).

2. SENSOR OUTPUT POWER: +12 VDC ±5% regulated, 60 mA max.

3. SIGNAL INPUT CHARACTERISTICS: See “PRS1 Input Circuits,

Sensor Connections & Configuration Switch Set-ups” section.

4. FREQUENCY RANGES AVAILABLE: Available in 5 ranges, each range

providing a relay pick-up or drop-out adjustment span of 10:1. (See Ordering

Information)

5. RELAY CONTACT OUTPUT: FORM “C” (SPDT) contacts max. rating 5

amps @ 120/240 VAC or 28 VDC (resistive load) , 1/8 H.P. @ 120 VAC

(inductive load). The operate time is 5 msec nominal and the release time is

3 msec nominal.

6. RELAY LIFE EXPECTANCY: 100,000 cycles at max. rating. (As load

level decreases, life expectancy increases.)

7. RESPONSE TIME: Response time is equivalent to the period of set-point

frequency, plus 5 msec for relay pickup or plus 3 msec for relay dropout.

8. OPERATING TEMPERATURE RANGE: 0 to 60°C.

9. WEIGHT: PRS1 PLUG-IN MODULE - 8 oz (226.8 g).

WARNING: SPEED SWITCHES MUST NEVER BE USED AS PRIMARY

PROTECTION AGAINST HAZARDOUS OPERATING CONDITIONS.

Machinery must first be made safe by inherent design, or the installation of

guards, shields, or other devices to protect personnel in the event of a

hazardous machine speed condition. Then a speed switch may be installed to

help prevent the machine from entering the unsafe speed condition.

DIMENSIONS In inches (mm)

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