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ON TIME CALCULATIONS AND EFFECTS OF TUNING PARAMETERS

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 GP470FA APPENDIX B: INTERMEDIATE RELAYS When the damper actuator requires more than 3-1/2 Amps or 120 Vac, intermediate relays are required for controller protection.  The relays must be enclosed to protect personnel from electrical hazard.  A NEMA 4 enclosure is required for outdoor installations. Provide a suitably sized fuse to protect the actuator.  Wiring to the actuators and solid state relay terminals 1 and 2 should be sized to accommodate the maximum expected current.  #18 AWG wire is suitable for connections between the DPS and solid state relay terminals 3 and 4. Consult the manufacturer for the current required to drive the damper actuator.  Solid state relays are available with 10 Amp, 25 Amp and 40 Amp ratings.  Hauck recommends * Crydom relays which require a 6.8K Ohm 2W resistor between terminals 3 and 4 as shown in the schematic diagram below. Crydom Model Rating Voltage A2410 10 Amps 48-280 Vac A2425 25 Amps 48-280 Vac A2440 40 Amps 48-280 Vac *Manufactured by: International Rectifier Inc. 1521 E.  Grand Ave. El Segunda, CA 90245 Phone: 213/322-4987 (page 3-48)







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