GSE 250 - Setpoint Output Connection; Model 250 and 250 SS Outputs; Model 250 X Outputs

Page 18 250 Technical Reference
S
S
E
E
T
T
P
P
O
O
I
I
N
N
T
T
O
O
U
U
T
T
P
P
U
U
T
T
C
C
O
O
N
N
N
N
E
E
C
C
T
T
I
I
O
O
N
N
MODEL 250 AND 250SS
The output drivers for the Model 250 are isolated open emitter transistor drives that are capable
of driving up to a total of 300mA. This configuration allows for the direct connection of the
indicator outputs to most PLC types.
The voltage applied to the COM terminal appears on the output lines (i.e. OUT1 and OUT2) when
the outputs are active (e.g. to connect to a PLC connect +24V to the common terminal). The
outputs can then be connected directly to PLC inputs so when activated the PLC will see the 22V
signal (approx. - the exact switch loss will depend on loading of the output).
To drive external loads (e.g. relays), connect the relay coil positive supply to the output common
and the output line directly to one side of the relay coil. Connect the other end of the relay coil to
the negative supply. It is recommended that fly-back diodes or transient suppressors be fitted
across relay coils to limit switching noise.
MODEL 250X
The output drivers for the instrument are high side drive and are capable of driving up to 400mA
each. This configuration allows for the direct connection of the instrument outputs to most types
of PLC.
The voltage applied to the instrument’s positive power supply terminal (+) appears on the output
lines (Over, Pass and Under) when the outputs are active. The outputs can then be connected
directly to PLC inputs.
To drive external loads (eg. relays), connect the output line directly to the positive side of the
relay coil. Connect the negative side of the relay coil to COMMON. It is recommended that fly-
back diodes or transient suppressors be fitted across inductive loads such as relay coils to limit
switching noise.
Out
p
ut to Rela
y
(
250X
)
Out
p
ut to PLC
(
250X
)
Output to Relay (250/250SS)
Output to PLC (250/250SS)