Schneider RE7TP13BU Einschaltverzögerungszeitrelais

Serie: Zelio Time RE7 timing relay; Status: Auslaufmodell (Production stopped on Apr-02-2021)

Funktion: Einschaltverzögerung. Timing starts upon power-on; contacts actuate after preset delay expires.

Model Designation

RE7: Zelio Time RE7 timing relay series

TP: T=timing, P=Power-on delay

13: 2 change-over contacts (2CO)

B: Multi-voltage version (24 V AC/DC / 42-48 V AC/DC / 110-240 V AC three supply ranges)

U: Schraubklemmen, DIN-Schienenmontage

Wichtigste technische Spezifikationen

Anschlussbelegung

A1-A2: 110-240 V AC power supply

B1-A2: 24 V AC/DC power supply

B2-A2: 42-48 V AC/DC power supply

15-16-18: 1st change-over contact; 25-26-28: 2nd change-over contact

⚠️ No galvanic isolation between supply circuit and control circuit. Observe safety precautions for wiring.

Official Direct Replacement

RE22R2AMR (Harmony RE22 series). Pin-out and dimension compatible, on-delay function, 2CO-Kontakte, wide-range supply 24-240 V AC/DC, timing range 0.05 s-300 h.

Ersatzhinweise

1. RE22R2AMR is directly interchangeable on DIN rail with identical wiring logic.
2. RE7TP13BU features triple-range supply; RE22R2AMR uses single wide-voltage 24-240 V AC/DC without separate A1/B1/B2 terminals.
3. Equivalent timing range, contact ratings and 22.5 mm width.
4. For legacy equipment, only stock / second-hand units are available; new projects shall adopt RE22R2AMR.

Second-hand Unit Inspection Checklist (Spare-part Service)

1. Power-on test: Apply AC220 V across A1-A2, adjust time range switch. Verify reliable contact switching after timing elapses by observing LED status.
2. Use multimeter to check continuity of both change-over contact sets; confirm no contact welding.
3. Inspect housing and adjustment knobs for cracks; check terminals for burn marks.
4. Calibrate timing: Test short-time-range (second-scale) actual timing error to verify aging of timing circuitry.

Practical Application Cases for Schneider RE7TP13BU On-Delay Timing Relay

Key characteristics: Timing starts upon coil energization, immediate reset upon power removal; 2CO change-over contacts; 0.05 s-300 h wide timing range; multi-voltage input 24/48/230 V; DIN-rail installation. Widely used in simple control cabinets without PLC, legacy-equipment retrofits and complete machinery. Auslaufmodell; new-project replacement: RE22R2AMR.

Case 1: Star-Delta Motor Reduced-Voltage Starting (Classic Application)

Industrie: Water-pump, air-compressor and fan control cabinets

Verdrahtung: RE7TP13BU coil is wired in parallel with main contactor. Timed NC contact is series-connected into star-contactor circuit; timed NO contact is series-connected into delta-contactor circuit.

Preset delay: 3-10 s, adjusted according to motor power rating.

Operating sequence:

1. Upon start command, main contactor and star-connection contactor pull-in; motor starts in star-configuration. RE7TP13BU is energized and timing begins.
2. When preset time expires: timed NC opens to de-energize star contactor; timed NO closes to energize delta contactor. Motor switches to full-voltage delta-mode operation.

Selection advantage: Dual 2CO contacts exactly serve for star-circuit breaking and delta-circuit closing. Multi-voltage compatibility fits cabinet AC220 V / AC24 V control supplies.

Notiz: Implement electrical interlock between star and delta contactors to prevent short-circuit.

Case 2: Sequential Motor Start-up for Production Line (Mitigate Inrush Current)

Industrie: Förderstrecken, batching equipment, packaging-machine cabinets

Erfordernis: After system power-on, 1 main conveyor motor starts immediately; 2 feeding motor starts after 5 s delay; 3 discharging motor starts after further 8 s delay, avoiding simultaneous heavy inrush current to power grid.

Durchführung: Two RE7TP13BU units. Global start signal energizes both timer coils simultaneously.

Unit 1 set to 5 s: contact closes to start 2 motor upon timeout.

Unit 2 set to 13 s: contact closes to start 3 motor upon timeout.

Equipment advantages: High accuracy for short delays starting at 0.05 s; compact 22.5 mm DIN-rail footprint saving cabinet space; supports 24 V DC control for legacy DC-control panels.

Case 3: HVAC Compressor Power-on Delay Protection

Industrie: Central-air-conditioning units, air-cooled chiller cabinets

Process requirement: Compressor must not start immediately after unit power-on. A waiting period of 3-5 minutes allows refrigerant pressure equalization and prevents compressor damage from liquid slugging. Cooling fan runs directly.

Logik: Upon main power-on, cooling-fan contactor energizes directly. RE7TP13BU coil is energized concurrently and starts timing. After delay expires, contact closes to actuate compressor contactor. Timer auto-resets after power loss for fresh timing on next startup.

Selection highlight: Full-scale up to 300 h covers minuteand hour-range settings; wide-temperature capability -20~+60 ℃ suitable for high cabinet ambient temperatures.

Case 4: Power-on Pre-heat Delay Output for Heating Equipment (Öfen)

Industrie: Small thermal-treatment ovens, curing furnaces

Erfordernis: Heating elements energize immediately. After preset cavity pre-heating time elapses, output signal enables door-opening permission or activates conveyor for material discharge.

Logik: Closing main equipment switch energizes heaters directly. RE7TP13BU coil is powered to start timing. After timing completes, change-over contacts toggle to provide ready-signal to downstream contactor / Anzeigelampe.

Erläuterung: One NO contact acts as “pre-heat complete” ready signal; the complementary NC contact provides interlock to inhibit output during pre-heating phase.

Case 5: Power-on Debounce for Pump-station Control (Suppress Spurious Alarms)

Industrie: Water-supply-and-drainage control cabinets

Problem: Level-sensor signals are unstable for a short interval immediately after cabinet power-on, triggering false alarms.

Lösung: RE7TP13BU on-delay set to 2-3 s upon system energization. Alarm circuit is enabled only after timing expires. Transient power-on spikes are filtered; only stabilized level-sensor signals can trigger alarms.

Case 6: Safety-gate Confirmation Delay for Complete Machinery

Industrie: Small-size machine-tools, automatisierte Werkzeugvorrichtungen

Logik: When safety gate is fully closed, gate limit-switch energizes RE7TP13BU coil. A 0.5-1 s delay confirms reliable gate latching; contacts close afterwards to permit machine motion, preventing false start-ups caused by gate-contact bounce.

Operational Notes & Common Field Pitfalls for RE7TP13BU

1. On-delay characteristic: Coil de-energization triggers immediate full reset and timing clearance. Cannot perform off-delay functions; select RE7RP-series for power-off delay.
2. Power-supply terminal distinction: A1-A2 =110-240 V AC; B1-A2 =24 V AC/DC; B2-A2 =42-48 V AC/DC. Wrong terminal connection will destroy internal electronics.
3. Contact capacity: AC-15 250 V rated maximum 3 A. Do not drive large-size contactor coils directly; use intermediate relay as buffer.
4. Spare-part replacement: For failed RE7TP13BU inside legacy cabinets, replace with RE22R2AMR. RE22 uses single wide-voltage 24-240 V AC/DC without B1/B2 terminals; minor schematic modification required.

Operating Principle of Schneider RE7TP13BU On-Delay Timing Relay

RE7TP13BU is an analog-electronic on-delay timing relay. It has no microcontroller / PLC chip and implements timing by means of RC charge-discharge circuit, DIN-Schienenmontage, ausgestattet mit 2 change-over (2CO) Kontakte.

Core logic: Timing commences only when coil is energized. Contacts remain in original state before timeout. Output contacts toggle upon timing completion. Full instant reset and timing clearing upon coil de-energization.

Internal Functional Blocks

1. Multi-voltage power-supply unit: Accepts three supply ranges (24 V AC/DC, 42-48 V AC/DC, 110-240 V AC), converts external control voltage to low-voltage working power for internal electronic circuits.
2. RC timing circuit: Range-selector switch selects timing span; potentiometer performs fine adjustment; timing is realized via capacitor charging.
3. Comparator-driving circuit: Monitors capacitor voltage. When charging voltage reaches threshold level, it actuates output relay.
4. Output execution relay: Two change-over contact sets (15-16-18 / 25-26-28), passive dry-contact switch for external signal output.
5. Status LED indicator: Constantly lit when powered. LED does not indicate timing completion (RE7-series LED only shows supply presence).

Complete Operating Sequence (On-Delay Mode)

① Coil de-energized (No voltage between A2 and selected power terminal)

Timing circuit is inactive. Output contacts stay in static original status:

15-16, 25-26: Normally-Closed (NC) geschlossen

15-18, 25-28: Normally-Open (NEIN) offen

② Coil energized (Power-on instant)

Power-supply block activates immediately, capacitor starts charging from zero, timing initiates.

⚠️ Contacts do not actuate at power-on instant. They retain static NC-closed / NO-open state. This is the key feature of on-delay relay.

③ Timing in-progress

Capacitor keeps charging; potentiometer determines charging rate. Output contacts remain unchanged until preset time is reached.

④ Timing completed (Timeout)

Capacitor voltage hits comparator threshold; drive circuit pulls-in output relay:

Normally-Closed NC (15-16, 25-26) opens

-Normally-Open NO (15-18, 25-28) closes

This contact state is maintained as long as coil remains energized; no auto-reset occurs.

⑤ Coil de-energized (Ausschalten)

Regardless of whether timing cycle has finished, once supply is removed:

Capacitor discharges rapidly; output relay drops-out instantly. Timing is cleared; all contacts revert to static condition immediately.

✔ Important characteristic: Reset upon power loss. No timing retention, cannot realize off-delay. Select RE7RP13BU for power-off-delay requirement.

Highlights der wichtigsten Prinzipien

1. Multi-voltage feeding principle: B1-A2, B2-A2, A1-A2 are three independent power-input terminals sharing common A2 return. Use only one supply pair; leave other terminals floating. Never feed two voltage sources simultaneously to avoid burnout.
2. Time-setting principle: Knob selects timing magnitude (Sekunden / Minuten / Std.). Panel potentiometer provides continuous fine-tuning from 0-100 % within selected range. Timing accuracy: ±10 % full-scale.
3. Passive dry-contact output: Output contacts are galvanically non-isolated from internal supply circuit. Contacts serve as mechanical switches, capable of switching external AC220 V or DC24 V loads.

Comparison with Easily-Confused Off-Delay Type

Häufige Missverständnisse

1. ❌ Misconception: Lit LED = timing completed.

For RE7TP13BU, LED only indicates power-on status. Verify contact state to judge timeout, LED will not change upon timing completion.

2. ❌ Misconception: Brief power-interruption pauses timing.

Any coil-voltage removal clears timing counter completely; no pause function available.

3. ❌ Misconception: Accept short trigger pulse to initiate timing.

Coil must maintain continuous energization. For pulse-triggered timing logic, use external auxiliary relay to latch coil supply.

Principle Difference vs. Replacement Model RE22R2AMR

RE22R2AMR is new-generation digital on-delay relay adopting MCU-based timing instead of analog RC network. Supply is unified wide-range 24-240 V AC/DC without separate B1/B2/A1 power terminals; functional logic is fully equivalent.