Schneider RE7TP13BU Time-Delay Relay

Serie: Zelio-Time RE7 On-delay Relè temporizzatore | Stato: Interrotto (Production ceased on 2021-04-02)

Specifiche principali

Spiegazione del codice modello

RE7: Zelio-Time RE7 timing relay series

T: On-delay function

P: Multi-range timing

13: 2 contatti di scambio

QUESTO: 24 V AC/DC coil supply

Official Replacement Model

RE22R2AMR (Sostituzione funzionale diretta, in ritardo, 0.05s-300h, 24-240V CA/CC, 2C/O, 22.5 mm DIN-rail footprint)

Nota: RE7TP13BU is no longer factory-supplied; solo scorte in eccedenza / used units are available on the market. Per nuovi progetti, use RE22R2AMR directly.

Applicazioni tipiche

PLC output delay, motor start-up delay, lighting delay, equipment power-on sequence control.

Judging whether Schneider RE7TP13BU Time-Delay Relay Requires Replacement

RE7TP13BU is discontinued, genuine new factory units are unavailable; most available units are surplus stock or second-hand. As an analog electronic timing relay, its typical failures include timing deviation, contact failure and no-operation. Evaluation covers visual inspection, powered static check, functional test and contact load assessment.

1. Ispezione visiva (Power-off status)

Replace the unit if any of the following occurs:

1. Cracked housing, burn marks, arc scorch marks on terminals or melted plastic;
2. Terminali allentati, ossidato / corroded copper conductors, arc black spots at crimp points;
3. Sticky, slipping or idling timing adjustment knob that cannot switch ranges;
4. Visible water intrusion, oil contamination or corrosion on internal PCB;
5. Illegible or peeled-off nameplate marking, model cannot be confirmed.
6. Powered Static Check (Coil energized only, no load connected)

Coil supply: 24V CA/CC

1. Indicator LED completely off after power-on:

Verify supply voltage and polarity. If supply is correct but LED stays off → internal power circuit damage, mandatory replacement.

2. Flickering or dimming indicator LED: Degraded internal voltage-regulation components, imminent total failure; consigliata la sostituzione.
3. Abnormal buzzing / faint arcing noise upon power-on: Internal PCB leakage; replace immediately.

✔ Normal status: Indicator LED stable ON, nessun rumore anomalo.

3. Core Functional Test (Critical step for timing performance validation)

Funzione: In ritardo

Logica: Coil energized → timing starts; output contacts change state only after preset time elapses.

Test procedure:

1. Set a short delay e.g. 10 s;
2. Apply 24 V to coil, monitor 2 change-over contacts with multimeter continuity mode;
3. Contacts remain in original state immediately after coil energization; contacts shall reliably toggle after 10 s; contacts reset instantly when coil power is removed.

Replacement trigger conditions (any of below)

1. Contacts toggle immediately upon coil energization (zero delay): Timing chip damage.
2. Contacts never act when preset time expires: Timing circuit failure.
3. Severe timing deviation: Setting 10 s but actual delay is 30 s, or inconsistent timing. Allowable tolerance for RE7 is ±10 % full-scale; deviations far beyond this indicate component aging.
4. Intermittent timing failure; function temporarily restored after power-cycle: Capacitor aging, the most frequent failure mode for this model.
5. Abnormal reset: Contacts fail to reset and remain latched after coil de-energization.

Nota integrativa: Minimum trigger pulse 20 ms. Input pulses shorter than this will not start timing — this is product characteristic, not a fault.

4. Output Contact Load Test (Under practical load conditions)

Valutazione dei contatti: 8 A resistive load for 2 contatti di scambio

1. Timing passes no-load test, yet contacts fail to close / open with actual load connected.
2. Severe terminal overheating under loaded operation.
3. Obvious arcing at contact switching, intermittent load ON/OFF.

👉 Silver-nickel contact wear / erosion; cannot be repaired, replace directly.

Nota: Damaged contacts render the unit unsafe even if timing logic works correctly; unexpected equipment sequence malfunctions may occur.

5. Service-life & Environmental Assessment
6. Rated mechanical endurance: 20 milioni di cicli. For equipment with frequent start-stop cycles over many years, consider spare-part replacement even if current performance seems normal.
7. Long-term exposure to high cabinet temperature, humidity or dust accelerates electrolytic capacitor aging for this legacy series; latent random-failure risks exist.
8. Replacement-after-failure Selection

Genuine replacement: RE22R2AMR

24-240VAC/DC supply, in ritardo, 0.05s-300h, 2 contatti di scambio, 22.5 mm DIN-rail mounting footprint.

Quick Troubleshooting Reference Table

Fallimenti comuni & Remedies for Schneider RE7TP13BU Time-Delay Relay

Important notice: RE7TP13BU is discontinued. Electrolytic-capacitor aging is its dominant failure cause. PCB damage cannot be repaired; sostituire l'unità completa, dis-assembly for repair is not recommended. Valutazione della bobina:24V CA/CC, 2 change-over contacts rated 8 A.

Colpa 1: No indicator light, no response after coil energization

Possibili cause

1. Incorrect supply voltage, loose / poor wiring connections;
2. Blown fuse or fault in external supply circuit;
3. Internal power-stage damage (electrolytic-capacitor breakdown, open-circuit coil).

Rimedi

1. Measure coil terminal voltage to confirm 24V AC/DC; verify screw-terminal torque 0.6-1.1 N·m.
2. If external circuit is healthy and full voltage is present but unit remains dead → internal damage; sostituire l'unità.

Do not repeatedly apply power, risk of secondary damage to downstream equipment.

Colpa 2: LED ON, but zero delay; contacts act immediately upon power-on

Possibili cause

1. Accidental dip-switch mode misconfiguration;
2. Degraded / broken timing circuitry (timing IC, timing-capacitor breakdown).

Rimedi

1. Confirm mode selection is On-delay, verify no wrong-position dip-switch.
2. If settings are correct yet contacts toggle instantly → component failure; sostituire il relè.

Colpa 3: Contacts never act when preset time expires

Possibili cause

1. Wrong time-range selection; set delay far exceeds actual waiting period;
2. Undervoltage coil supply;
3. Internal timing-circuit failure;
4. Mechanical contact jamming.

Rimedi

1. Test with short-time setting (e.g.10 s) to eliminate configuration error.
2. Ensure coil supply voltage ≥85 % of rated voltage.
3. If short-time test still yields no contact action → unit failure; sostituire.

Colpa 4: Unstable timing; timing drifts fast/slow intermittently (Most-common failure for this model)

Sintomi: Setpoint 10 s yields actual delays ranging from 5 s to 25 s; temporary recovery after power-cycle, random fault recurrence.

Causa ultima: Electrolytic-capacitor aging inside RE7 series; cabinet high temperature accelerates degradation; typical aging failure for legacy units.

Rimedi

1. Avoid continuous ambient temperature above 60 °C.
2. Allowable timing tolerance: ±10 % full-scale; deviation exceeding this threshold indicates component aging.
3. Random drift cannot be repaired. Replace unit immediately; continued operation risks uncontrolled equipment sequence faults.

Colpa 5: Contacts fail to reset and stay latched after coil de-energization

Possibili cause

1. Insufficient reset interval: RE7TP13BU requires minimum 50 ms reset time; rapid power-cycle prevents full reset.
2. Contact welding due to overload-induced contact erosion.
3. Internal mechanical jamming.

Rimedi

1. Ensure coil de-energization duration >50 ms before re-energization.
2. Measure contact continuity in power-off condition. Persistent continuity confirms contact welding; mandatory replacement.
3. Verify downstream-load current does not exceed 8 A resistive rating to prevent repeated damage to new relay.

Colpa 6: Good no-load timing performance, yet intermittent ON/OFF and terminal overheating under load

Possibili cause

Contact wear-erosion; actual load exceeds contact rating. Elettrovalvole / bobine del contattore (carichi induttivi) require contact derating.

Rimedi

1. 8 A rating applies purely for resistive loads. For inductive loads such as solenoid valves and contactor coils, derate operating current to 3-4 A maximum.
2. Replace unit if contacts are eroded (non-repairable).
3. For high-power inductive loads, install intermediate relay for isolation; avoid direct-driving via timing-relay contacts.

Fault7: Adjustment knob slips or cannot switch ranges

Possibili cause: Worn-out internal plastic gears or potentiometer.

Rimedio: Time adjustment function lost; sostituire l'unità.

Fault8: LED tremolante, internal buzzing noise

Causa: Degraded power-supply filter capacitor; PCB leakage risk.

Rimedio: Potential short-circuit hazard; replace unit immediately, do not keep in service.

Quick-distinguish: External-wiring fault vs Relay-unit internal fault

Disconnect all load wiring from output contacts; energize coil only, measure relay-body contacts with multimeter continuity mode.

1. Full-function performance in no-load test, failure occurs only under load → contact damage or load over-rating.
2. Timing abnormality already present in no-load test → internal relay-unit failure.

Replacement Option

Obsolete RE7TP13BU, recommended replacement RE22R2AMR

Nota: Pin-out definitions are not identical between the two models. Cross-check wiring before replacement; direct plug-and-swap is not feasible.

Raccomandazioni per la manutenzione

1. For high-temperature cabinet environments, keep spare-stock of legacy RE7 timing relays. Electrolytic-capacitor aging creates hidden faults that only surface during equipment downtime.
2. Do not drive inductive-loads directly via timing-relay contacts; add intermediate-relay isolation.