4. Shielded cable from the probe to the board should be run in conduit. The probe is connected
to terminals on the rightmost terminal block labeled Red, White, Black & Shield. Connect
the shield leads (drain wires) from the probe cables to the terminals labeled SHLD. If a splice
is made between the control and probe leave the probe unshielded no more than 20 to 30
mm.
5. The output relay may be operated in a "follower" mode or "memory" mode depending upon
the wiring of the RESET input. The mode connections and definitions are described below.
a) To operate the output in the "follower" mode, jumper RESET and COM. together on the
terminal block. When a DOUBLE condition occurs, the relay drops out and the DOUBLE
indicator comes on. When the double metal condition is removed, the relay returns to the
normally energized condition, the amber DOUBLE indicator goes out and the green NO
DOUBLE indicator turns on. Automatic reset is normally selected to control the operation
when the fault condition is automatically removed or the DS100 is wired into the stop circuit
of a machine with a manual restart circuit.
b) To operate the output in a "latch" mode, wire the RESET and its associated COM terminal to
the normally open contact of a switch, relay, or controller output. In this mode, when a fault
condition occurs, the relay drops out and the DOUBLE indicator comes on. After the fault
condition is corrected, the RESET contact must be momentarily activated to bring the relay
back to the NO DOUBLE state.
INPUTS AND CONTROLS
The primary control input to the DS100 is the calibration push-button switch on the front panel.
Use of this switch is described below under CALIBRATION.
The DS100 has two logic inputs labeled CAL and RESET. The CAL input parallels the function
of the calibrate push-button on the front panel allowing the calibration function to be performed
through a remotely located switch wired to this input. The RESET input controls the latching of
the relays as described in item 5 of the Electrical Wiring section above.
The two logic inputs have associated with them two jumper plugs located under the front cover
and immediately behind its associated terminal. The function of these jumpers is described
below under CONFIGURATION SWITCHES AND JUMPERS.
Both the CAL and RESET inputs are ON when low (zero volts) independent of the jumper
settings.
A two position DIP switch between the two main connectors, is visible from the connector edge
of the unit. These switches control the selection of the calibration mode and the system response
time as described below under CONFIGURATION SWITCHES AND JUMPERS.
