Application manual for PSRclassic and PSRmultifunction, and the modular safety relay system
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PHOENIX CONTACT 102597_en_03
The table is valid for the following safety relays:
1 PSR-URM4/4x1/2x2/B
Table 8-9 Diagnostic description for PSR-URM4/4x1/2x2/B safety relay
K1/K2
Fault Remedy
Connection/
voltage error
Supply voltage not present.
Apply supply voltage, e.g., via the PSR-
TBUS DIN rail connector.
Supply voltage too low. Adjust supply voltage.
The input circuit is connected incorrectly or
not connected at all.
Check the PSR-TBUS connections
between the modules.
Insert PSR-TBUS-TP dummy plug.
Short circuit
Between contact points A1 and A2. Remove short circuit.
Fault with
internal cause
Checkback contacts 11 and 12 faulty.
Replace safety relays.
Enable contact(s) of K1 and K2 faulty.
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