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Digital Precision Electronic Positioning System
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PEPS® II improves and builds upon TMC’s patented PEPS® (Precision Electronic Positioning System). With the addition of a new digital controller, PEPS® II is easier to use, offers more features, and has an improved user interface. PEPS® II is a digital non-contacting, height control system for TMC pneumatic vibration isolation systems. Such systems normally incorporate mechanical height valves and a mechanical height sensing linkage. Its applications range from semiconductor manufacturing equipment to improve settling time and increase yields, to precision laboratory environments which demand the optimum noise performance and platform stability.




U.S. Patent No. 5,832,806
PEPS® II Digital Precision Positioning System


Physical Dimensions
PEPS® II Controller 1.72" (43.7mm) H x 8.0" (203mm) W x 9.4" (240 mm) D
PEPS® II Controller: approximately 3.0 lb (1.2 kg)
(refer to EN 61010-1: 1993,
EN 61010-1/A2: 1995)
For indoor use only, up to an elevation of 2,000 m (6560 ft.)
Maximum allowable temperature range: 5° C to 35° C
Maximum allowable humidity: 80% up to 31° C, decreasing linearly to 50% relative humidity at 40° C
Tolerance in main supply voltage: 85 VAC - 240 VAC
Over voltage category: 2
Pollution degree (IEC 664): 2
Ventilation requirements: 25 mm clearance on sides, 0 mm top and bottom
Power Requirements
Power input voltage range: 90-230 VAC
Input frequency range: 50-60 Hz
PEPS® II User Interface
(Front Panel)
Power switch
4 menu buttons
LCD display 20 x 2 characters
2 diagnostic sockets (BNC-type)
Three-color status LED
USB port
PEPS® II Interface
(Rear Panel)
AC power entry with EMI filter
1 air INPUT snap-in port for 1/4" O.D. tubing
1 air OUTPUT (Exhaust) snap-in port for 1/4" O.D. tubing
4 air snap-in ports for 1/4" O.D. tubing (one per isolator)
DB-25 male inputs-outputs and feedforward socket
1 Phoenix 0.2" pitch 6 pins GREEN header (vertical proximity sensors)
1 Phoenix 3.5 mm pitch 6 pins BLACK header (horizontal proximity sensors)
Grounding threaded stud (#10-32 thread)
DB-25 F socket: 1x digital Input, 3x geophone sensors interface (“-VX” option)
DB-25 F socket: 1x digital input, 3x current output proximity sensors (optional)
Analog inputs (unipolar): 8 x 12 bit (16 bit using over sampling), 0…3.0 V full scale
Analog inputs (feedforward): 5 x 12 bit
   (16 bit using over sampling), ±9 V full scale
Analog inputs (unipolar) protection: +5 Volts, -0.5 V clipping
Analog input (feedforward) protection: ±15 Volts clipping
Analog outputs: 4 x 12 bit (16 bit with over sampling), 0…3.0 V full scale
Analog outputs (OPTIONAL): 8 x 16 bit, 0…3.0 V full scale
Analog output protection: indefinite short circuit protection, +5 Volts clipping
Digital input voltage rating: 0…+3.3 V, +5 V tolerant (+5 Volts clipping)
Digital output rating: 0…+3.3 V, 20 mA max.
Digital I/O protection: +5 Volts, -0.5 Volts clipping
External available power: +5 VDC, 2.0 A max; +15 VDC, 1.0 A max. (20 Watt max)
Communication port: USB, appears as RS-232 on PC
Processor: ARM7TDMI / 41.78 MHz
Control loop rate: 100 Hz - 2.0 KHz
Proximity sensors: 3x vertical, (3x horizontal optional) Eddy current, NAMUR 0-20 mA output
Velocity sensors - geophones (“-VX” option): 3x vertical, current output
Long-term height stability: ±50 microns
Long-term tilt stability: ±50 micro radians
Servo valves: 4 x 2-way variable-orifice proportional servo valves
Valving technique: pure class-A
Maximum input pressure: 120 PSI or 8.3 Bar or 830 KPa
Nominal air consumption: 60 slpm (2 scfm)
Air requirements: clean, dry air, filtered to 20 microns or better
Fail safe: isolators deflate on power failure or power off
Pneumatic fittings: 'one touch' quick fittings for 1/4" O.D. hose


How to Order
Vertical Transmissibility
PEPS® II Digital Precision Positioning System Performance
Contact TMC
An application engineer will configure a system for your unique requirements and provide a quotation.
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