Operating instructions

3. Connections to the control circuit of the machine are made through the form C output relay.

This relay is powered in the OK condition. The relay picture on the front panel of the PD100

indicates the “OK” state. If power is lost to the control the relay is not energized and the

relay defaults to the “OUT” state.

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 an OUT condition occurs, the relay drops out and the OUT indicator

comes on. When the target comes within the OK range again, the relay returns to the

normally energized condition, the amber OUT indicator goes out and the green OK indicator

turns on. Automatic reset is normally selected to control the operation when the fault

condition is automatically removed or the PD100 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 OUT indicator comes on. When the target

comes within range again, the RESET contact must be momentarily activated to bring the

relay back to the OK state.

INPUTS AND CONTROLS

The primary control input to the PD100 is the calibration push-button switch on the front panel.

Use of this switch is described below under CALIBRATION.

The PD100 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.