Heavy Duty Chain Driven Zero Pressure Accumulator, Roach Model SZD251CDA Smart Zone™

Heavy Duty Chain Driven Zero Pressure Accumulator Roach Model SZD251CDA Smart Zone® can accumulate and release heavy duty products by singulation or slug release

TYPE: Accumulation Conveyors

MODEL: Roach SZD251CDA Smart Zone™

The Model SZD251CDA is a heavy duty roll-to-roll chain driven zero pressure accumulator designed to safely accumulate heavy items such as drums, castings, containers and pallet loads in 5' zones.


  • Designed to safely accumulate heavy products in 5’ zones
  • Can handle 1000 lbs./ft. up to a maximum of 4000 lb. pallet.
  • Incorporates photoelectric sensors, instead of sensor rollers, which eliminates many of the problems associated with conveying wooden pallets
  • Products do not touch during accumulation
  • Items are singulated individually off of the conveyor
  • Easy to install
  • Simple to maintain
  • Smooth product accumulation
  • Two types of discharge:  zone singulation release, and slug release (optional)
    A singulation release method is when the conveyor zones are controlled such that the product is discharged from one zone only when the immediately adjacent downstream zone is empty.
    Slug mode allows all packages to be released simultaneously.


  • Tread Rollers: 2-1/2” dia. x 11 ga. steel, model 251S.
  • Chain Drive: Roller-to-roller No. 40 roller chain. Zone-to-zone No. 60 roller chain.
  • Center Drive: Drive either side mounted or underside mounted (specify). Drive shafts are supported by precision, heavy duty, lubricated, ball bearing units.
  • Roller Centers: 4” or 6” Only
  • Bed: 7” x 1-1/2” x 7 ga. and 5” x 1-1/2” x 7 ga. formed steel channel frame. Bed sections bolted together with butt couplings and floor supports.
  • Accumulation Zone: 5’-0” zone lengths, zone singulation operation, photo electric sensor controlled zones with separate drives on each zone.
  • Speed: 35 FPM, constant
  • Chain Guard: Chains are completely enclosed along entire length of conveyor.
  • Bearings: Precision ABEC bearings.
  • Motor Drive: 1/2 HP, 230/460/3, 60 cycle, ODP right angle gear motor.
  • Capacity: 1000 lbs./ft. up to a maximum of 4000 lb. pallet.
  • Power Supply Panel: Nema 12 enclosure with 20Amp main disconnect and contactor. Control transformer. 24vdc power supply. Mounted and wired on conveyor. Customer to supply 480 V 3Ph 20Amp power, relay contacts closure from emergency stop relay. E-stop push buttons and pull cord switches are not supplied
  • Zone Components: Line mounted starter with overload relay prewired to motor
  • Zone to Zone Wiring: All zones prewired. Customer must reconnect cables at conveyor bed joints.


  • Zone Lengths: 3’ through 10’ in 4” or 6” increments as per roller centers and zone chain pitch. Frame lengths will vary with zone lengths.
  • Bed: 7” x 9.8 lbs./ft. and 5” x 6.7 lbs./ft. structural frames.
  • Tread Rollers: 2-9/16” x 7 ga. steel, model 297S tread rollers.
  • Floor Supports: Supports, knee braces, casters and polytier supports available. See Conveyor Accessories
  • Speed: Constant speed 20-120 FPM; DC variable speed; AC inverter variable speed. Other constant or variable speeds available. Minimum unit speed is 20 FPM for model CDA. NOTE: Capacity changes with speed.
  • Motors: Available through 3 HP in TEFC, explosion proof, dirty duty, brake motor, 115/230/1, 575/3, etc.
  • Defused SmartZone: Photo eyes mounted below tread rollers.

For more information on the Roach Model SZD251CDA Smart Zone™ Heavy Duty Chain Driven Zero Pressure Accumulator conveyor please contact a Thomas Conveyor & Equipment Automation Engineer at 844 220 0086 or click on the Contact Us button above.

QUESTIONS? CALL 844-220-0086