The full-feaured 7ES is designed for customers requiring 3-wire valve positioning with slidewire feedback and a full suite of advanced functions. The NEMA 4X rated 7ES is configurable for valve positioning or PID control with Smart AT auto or adaptive tuning, universal inputs, up to 4 outputs, and up to 3 independent alarms. The 7ES has a bright dual display for process temperature and setpoint, and 10 LED beacons to enhance operator information. OP1 and OP2 are interlocked relays for adjusting actuator position based on a slidewire feedback potentiometer. Alternately, OP1 can be used as a time proportioned relay output (heat) and OP2 the same (cool) or an alarm. OP3 and optional OP4 can be configured as alarms.
Alarms can be process high/low, deviation or band, direct or reverse, with masking and programmable automatic or manual reset.
A Variety of Standard and Optional Features Among the 7ES's standard features are bumpless auto/manual transfer, password security, alarm standby and Auto Comp sensor break, which freezes the controller output in the event of a detected sensor break. The 7ES also has an "output off" function which disables the control output, allowing the instrument to operate as an indicator but return smoothly to control when the output is again enabled. The 7ES is equipped with 3 logic inputs. Logic Input 1 is used to transfer between SP1 and SP2 by step or ramp (2 rates). Logic Input 2 can be configured to select
Logic Common
Logic Input 1 (SP1/SP2)
Logic Input 2 (Auto/Man or Dir/Rev)
Logic Input 3 (Local/Remote)
Auto/Manual or Reverse/Direct control action. Logic Input 3 selects between Local/Remote (computer) operation. Optional RS-485 digital communications with Modbus®, JBUS or proprietary Barber-Colman protocol is available for computer supervision
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Universal Input (7 T/C, RTD, mV, V, mA)
