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
Universal Input (7 T/C, RTD, mV, V, mA)
