The Compact Model 7SF is a dual display general purpose
1/16 DIN PID controller with autotuning and 3 configurable outputs.
OP1 (logic or relay) and OP2 (relay) are for heating + alarm or heating
+ cooling (air, oil or water) control and OP3 (relay) is an optional
second alarm. Alarms can be process, band or deviation type, direct
or reverse, with masking and automatic or manual reset. A logic input
is fitted as standard, allowing remote selection of an auxiliary setpoint.
The externally selected transfer between SP1 and SP2 can be a step
or a ramp with two configurable rates of change (ramp
up/ramp down). Bumpless Auto/Manual control
can be selected from the front panel. Detection of an out of range
or sensor break forces the output to a safe value (Auto Compª
sensor break). The 7SF is available with optically isolated RS-485
communications in three protocols for use with supervisory systems.
This easy to use instrument comes from the factory with its inputs
already calibrated and it can be configured either from the front
panel or via the communications port. NEMA 4X sealing allows it to
be used in washdown or dust conditions.
Remote Selection of Auxiliary Setpoint
A logic input may be used to remotely transfer between SP1 and SP2
by step or ramp change.
Heater Breakdown Detection
The 7SF has an option for displaying load current and generating
a heater breakdown alarm when current falls below a specified threshold.
With this option, a current transformer input replaces the standard
logic input.
Output Off Function
The 7SF also has an Òoutput offÓ function, allowing
the instrument to disable control and act as an indicator.
Universal Input (6 T/C, RTD, mV, V, mA)
