Marsh Bellofram Automatic Timing & Controls Division 324C Series Precision Switch Cam Programmer - Marsh Bellofram - #1

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CYCLE TIMES Choice of ON-Delay or OFF-Delay operation (not field-convertible). More than 270 cycle times, from 3 SEC to 60 HRS., from a choice of interchangeable motors and gears; each motor provides more than 20 cycle times. REPEAT ACCURACY ± 0.25% of cycle time. SETTING ACCURACY ± 0.25% of cycle time FRAME SIZES 3, 6, 9 and 12 cam frame sizes are provided CAMS NUMBER: 1 to 12 (or multiples up to 12, by combining timer assemblies); cams may be factory-set. CUT: Standard or “50% cut”, as specified (standard cams allow contact closure adjustment of 1 to 45% or 55 to 99%, “50% cut” cams allow contact closure adjustment of 12 to 52% or 48 to 88%; custom cams available with 2, 3, 4 or more cuts. CONSTRUCTION: Two-inch diameter split type; made of Delrin LIFE EXPECTANCY MECHANICAL: over 10,000,000 operations CONTACTS: over 1,000,000 operations at less than 1 amp 800.727.5646 automatictiming.com Automatic Timing & Controls 324C Series Precision Switch Cam Programmer // 324C Series 15 A compact and economical motor-driven cam timer, the 324C precisely controls one to twelve load circuits through easily-set screwdriver adjustable cams. Each timer provides a wide range of cycle times through a set of interchangeable gears. EASY AND PRECISE CAM ADJUSTMENT: With ATC’s unique split-cam design, each side of the cam is separately screwdriver-adjustable in either direction: either side determines the precise instant during the cycle when the switch will actuate, the other side determines how long the switch will remain actuated. Adjustments are easy and precise: 1/4 turn of the adjusting screw equals 0.5% of cycle time. A setting disc, calibrated in 1% increments, facilitates program set-up and indicates cycle progress. ONE TO TWELVE PRECISION SWITCHES: Whether used as a time or sequence programmer, the 324C can be ordered with any number of camoperated switches from one to twelve. Each SPDT precision switch is rated at 10 amps, 120 VAC and is 1/3 hp rated at 120 or 240 VAC. WIDE RANGE OF CYCLE TIMES: The 324C is available with a choice of 14 synchronous motors that provide more than 270 cycle times between 3 SEC and 60 HRS. Each motor provides an adjustable range of 21 cycle times, with a ratio of over 2.5:1, through a set of interchangeable gears. Changing gears is a simple operation that takes only a few minutes. ACCURACY: The repeat accuracy and setting accuracy of the 324C are both within ± 0.25%. Follower fingers precisely track the contour of the cams, accurately operating the precision switches with quick-break action. SEQUENCE CONTROL: The 324C can be ordered without a motor and with a 1 inch long shaft extension on either or both ends, for use as a rotary cam limit switch. APPROVALS: File No. E24305, LR26970 Prec i s io n Swi t ch C a m P r o g r a m m er LOAD SWITCHES TYPE: Precision switches; one for each cam CONTACT ACTION: SPDT (Form C) CONTACT RATING: 10 A at 120 VAC (non-inductive). 1/3 HP at 125/250 VAC MINIMUM CONTACT ACTUATION TIME: 1% of cycle time DRIVE MOTORS SPEED: choice of 14 TYPE: Synchronous; permanently lubricated; integral slip clutch for manual advance; anti-backup to prevent damage to switches VOLTAGE: 120 VAC, 50 or 60 cycles; optional: 24 or 240 VAC, 50 or 60 cycles. POWER CONSUMPTION: 12 watts max. DUAL DRIVE: two motors may be used, for dual-speed and special applications TORQUE-SPEED CAPABILITIES: At cycle times of 30 SEC or longer, the 324 can drive and switch 12 contacts simultaneously; below 30 SEC, the motor may be limited in its ability to drive or switch a number of contacts simultaneously. TEMPERATURE RATING 32 to 140°F (0 to 60°C) WEIGHT NET: from 1-1/2 lbs. for the 3 cam unit up to 3-1/2 lbs. for the 12 cam unit ENCLOSURES (Optional) NEMA 12 molded case for one model 324 with maximum of 3 cams. (See Accessories) \\\ SPECIFICATIONS