Diagnostic LEDs - PR-21-S

PR-21 Series User Guide

Document code
IM-EN-PR21S
Revision
C
Language
English
Product
PR-21-S
Document type
User guide

Figure 1 and Figure 2 assist in locating the diagnostic LEDs.

Table 1. Diagnostic LEDs
LED Status Indication See section
Front panel
Green LED Lit DTR power is on; processor card PR‑10500 is active. Blank display
Transmitter processor card PR‑10500
2 yellow LEDs Blinking Processor card OK.
Transmitter motherboard PR‑10600
Yellow LED (D17) Blinking Motherboard processor working.
Green LED (D16) Lit Processor card converts 24 V / 3 V.
Green LED (D26) Lit Isolating DC / DC conversion OK.
2 green LEDs (D23, D25) Lit Corresponding relay (RLY1 / RLY2) has power.
H1 interface card PR‑10701
Green LED (LD1) Lit Sensor A current correct, 20 … 60 mA.
Green LED (LD1) blinking Sensor A is being reset.
Red LED (LD2) Blinking Sensor A current is too high and the card is trying to reconnect with correct current. Troubleshooting messages
Red LED (LD2) Lit Sensor A current is too high and power supply to Sensor A has been switched off. Troubleshooting messages
Green LED (LD3) Lit Sensor B current is correct, 20 … 60 mA.
Green LED (LD3) blinking Sensor B is being reset.
Red LED (LD4) Blinking Sensor B current is too high and the card is trying to reconnect with correct current. Troubleshooting messages
Red LED (LD4) Lit Sensor B current is too high and power supply to Sensor B has been switched off. Troubleshooting messages
A lit red LED on PR‑10701 always indicates a problem. Red LEDs are always turned off in normal operation, whether any sensors are connected or not.
Figure 1. Diagnostic LED functions