ZIEHL EFR4002
ZIEHL EFR4002IP
ZIEHL EFR4002IP
Energy Flow Relay / Zero Export Device
Chinese-to-English Datasheet Translation
| Item | Details |
|---|---|
| Original title | Zero Export Device Type EFR4002IP — Energy Flow Relay (Measuring Relay for Self-Generation Systems) |
| Manufacturer | ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany |
| Contact | +49 791 504-0 · info@ziehl.de · www.ziehl.de |
| Document version | September 18, 2025 (original manufacturer's catalog, pages 142–145, 4 pages) |
| Translation notes | This translation is based on the complete English PDF provided. Professional terminology is retained where appropriate for cross-reference. The original wiring diagrams are reproduced from the source document, with German and English labels translated into Chinese in Section 5 of the original translation. |
1. Product Overview (Original Page 1)
The EFR4002IP Energy Flow Relay monitors the direction of current (power) flow between the public grid and a generating plant or consumer loads. The device can be conveniently operated remotely via its integrated web server or directly on the device itself. Measurement values are clearly organized and displayed on the device's display.
When the power generated by an on-site generating plant exceeds actual on-site consumption, self-consumption of the surplus energy is often more economical. This is particularly advantageous when there is a significant difference between the electricity purchase price charged by the grid operator and the feed-in tariff paid for electricity exported to the grid.
Many sites that would otherwise be suitable for photovoltaic installations have previously been unusable because the grid connection point permits only limited power export.
In Germany, the new standard VDE-AR-N 4105:2018-11 allows the installed generation capacity to exceed this limit by up to 66.6% or even more, provided that the additional generated electricity is consumed on-site rather than fed into the grid. The EFR4002IP can monitor the system to help ensure that this requirement is met while maintaining grid stability.
The same principle applies to zero-export applications, in which no electrical energy may be exported to the grid. In such applications, the device can serve as an Energy Flow Sensor (EnFluRi). The EFR4002IP is optimized for these functions and can exchange data with a PPS (Power Plant Controller).
1.1 Key Product Features
Zero-export device model: EFR4002IP
Compliance-related monitoring: Monitoring of Pav,e in accordance with VDE-AR-N 4105:2018-11.
Application objective: Optimize the self-consumption of self-generated electricity and increase the self-consumption ratio.
Energy Flow Sensor (EnFluRi) and feed-in limitation: Response time < 0.1 s.
Two operating modes: Zero-export device or limiter.
If the permitted feed-in power limit is exceeded, relay K3 disconnects the generating system or part of it.
Before disconnection becomes necessary, regulation can be performed via the analog output, or loads can be switched on via relays K1 and K2 to absorb surplus energy or reduce generator output.
Figure 1. Original page 1: Product overview, functions, features and ordering information.
2. Functions
Switching up to three loads: The operating mode can be configured for maximum-load priority, priority-based sequencing (1–2–3), or combinations of the three loads, providing a total of seven stages.
Switch-on and switch-off thresholds: Set the energy-flow levels at which loads are switched on and subsequently switched off.
Switch-on/switch-off delays and minimum on-time: These functions can also be used to control heat pumps (SG Ready), battery chargers and inverters.
3. Features
Suitable for medium-voltage applications.
Compatible with grounded medium-voltage current transformers and measuring devices connected in series.
Active power measurement: single-phase or three-phase, range ±99.99 MW.
Pav,e monitoring with predefined settings or freely configurable values.
Pav,e monitoring compliant with the entire limit curve.
Three current inputs for conventional current transformers with 1 A or 5 A secondary current.
Compatible with current transformers with adjustable transformation ratios.
Energy counters for separately recording exported and consumed energy.
Three relay outputs.
Four digital inputs, Y1–Y4, for control signals, such as forcing relays to switch on or off.
IP network connectivity with an integrated web server.
Measurement values can be read via Modbus TCP and SunSpec (Energy Meter model).
Analog output that can be used as a measuring transducer or for stepless control of a load.
4. Technical Data
| Item | Technical specifications |
|---|---|
| Rated supply voltage | 24–270 V DC/AC, 0 / 40–70 Hz; power consumption < 3.5 W, < 9 VA |
| Supply voltage tolerance | 20.4–297 V DC; 20–297 V AC |
| Relay outputs K1, K2, K3 | 3 × 1 change-over contact |
| Switching voltage | Max. 300 V AC, 300 V DC |
| Conventional thermal current (Ith) | Max. 9 A |
| Maximum switching capacity, cos φ = 1 | 2000 VA |
| Electrical contact life, cos φ = 1 | 10⁵ operations (at 300 V / 9 A) |
| Rated operational current | AC-15: Ie = 6 A at Ue = 250 V |
| Voltage measurement (RMS) | L1 / L2 / L3, each measured relative to N |
| Current transformer ratio | Adjustable from 1:1 to 1:250 |
| Phase-to-neutral voltage | 10.0–330.0 V AC / 50 Hz |
| Voltage resolution | 0.1 V |
| Maximum voltage measurement error | ±0.5% of full scale, ±1 digit |
| Current measurement | With current transformers; scalable up to 2,400 A |
| Nominal current / resolution | 1 A / 5 A AC; resolution 1 mA |
| Maximum current measurement error | ±0.5% of full scale, ±1 digit |
| Overload capacity | 6 A continuous; 12.5 A for a maximum of 1 s |
| Input resistance | 30 mΩ |
| Active power measurement | −99.99 to +99.99 MW with voltage transformers, single-phase or three-phase |
| Maximum active power measurement error | ±1% of full scale, ±1 digit |
| Analog outputs | DC 0/4/1–10…20 mA; DC 0/2/0–5…10 V |
| Analog output load | ≤500 Ω |
| Test conditions | Refer to “General Technical Information” |
| Operating temperature | −20 °C to +55 °C |
| Housing / mounting frame | V8 design / ER8 front-panel mounting kit, 8 modular units (8 TE) |
| Dimensions (W × H × D) | 140 × 90 × 58 mm; installation depth 55 mm |
| Protection rating: housing / terminals | IP30 / IP20 |
| Mounting | 35 mm DIN rail or M4 screw mounting |
| Weight | Approx. 300 g |
5. Wiring Examples and Diagram Legend
The original document provides three wiring examples:
Low-voltage grid.
Low-voltage grid with a measuring device connected in series.
Grounded current transformer for medium-voltage applications.
The original wiring diagrams are retained as provided in the source document. The following sections describe the application represented by each diagram.
5.1 Example 1: Low-Voltage Grid (Original Page 2)
Drawing title: Anschlussplan – Niederspannungsnetz (Connection Diagram – Low-Voltage Grid)
Drawing No.: 12720-0921-00
EA No.: 15792- (Page 1 of 1)
Drawing date: March 7, 2024 / tw
Figure 2. Original page 2: Technical data, display examples and low-voltage grid wiring diagram.
5.2 Translation of Diagram Labels (Example 1 and Device Terminals)
| Original German / English label | English meaning |
|---|---|
| öffentl. Stromnetz / public power grid | Public electricity grid |
| Eigen-erzeugungsanlage / generating plant | On-site generating plant |
| Verbraucher / consumer | Consumer load |
| schaltbare Verbraucher / switchable consumers | Switchable loads |
| Abschaltsignal Pav,e / switchoff signal Pav,e | Pav,e limit-exceeded shutdown signal |
| NA-Schutz Typ UFR, E1–E2 | Grid protection device (NA protection), type UFR, terminals E1–E2 |
| kWh | Energy meter |
| LSS | Miniature circuit breaker / protective switch |
| G | Generator |
| S1(k), S2(l); P1(K), P2(L) | Current transformer secondary-side (k–l) and primary-side (K–L) polarity terminals |
| L1, L2, L3, N; ~L–N max. 300 V; ~L–L max. 520 V | Three-phase conductors and neutral; maximum 300 V AC phase-to-neutral and 520 V AC phase-to-phase |
| Us 24…240 V AC/DC (A1 / A1') | Auxiliary supply terminals, 24–240 V AC/DC |
| 1I1/1I2, 2I1/2I2, 3I1/3I2, N; 1/5 A | Three-phase current transformer inputs, for 1 A or 5 A secondary current |
| K1, K2, K3 (11-12-14, 21-22-24, 31-32-34); max. 9 A | Three relay outputs with change-over contacts; maximum 9 A |
| Y1, Y2, Y0, Y3, Y4 | Digital inputs (Y0 is the common terminal) |
| U+ / OUT | Analog output (U+ is the positive terminal; OUT is the output terminal) |
| Ethernet (Act / Link) | Ethernet interface and activity/link status indicators |
| Menu ≥ 2 s | Press and hold the Menu key for at least 2 seconds to enter the settings menu |
| P L1 60.000 kW; P L2 −120.000 kW; P L3 −450.000 kW; P L123 −510.000 kW | Display example: L1 phase +60 kW, L2 phase −120 kW, L3 phase −450 kW, three-phase total −510 kW. Negative values indicate power export to the grid. |
| Max, Min | Maximum / minimum value indicators |
5.3 Example 2: Low-Voltage Grid with a Measuring Device Connected in Series (Original Page 3)
This configuration is intended for low-voltage grids where an existing energy meter or other measuring device is connected in series. The EFR4002IP obtains measurement signals through current transformers connected to the measuring circuit.
Figure 3. Original page 3: Wiring example for a low-voltage grid with a measuring device connected in series.
5.4 Example 3: Grounded Current Transformer (Medium-Voltage Application, Original Page 4)
This configuration is intended for medium-voltage applications using grounded medium-voltage current transformers. The adjustable current transformer ratio (1:1 to 1:250), together with a suitable current transformer, enables energy-flow monitoring on the medium-voltage side. The measurable current range can be extended to 2,400 A.
Figure 4. Original page 4: Wiring example for a grounded current transformer and safety statement.
6. Ordering Information and Accessories
| Model | Part number | Description |
|---|---|---|
| EFR4002IP | S227260 | Main energy flow relay / zero-export device |
| ER8 | T224388 | Mounting frame for front-panel installation (accessory) |
Accessories
ER8 mounting frame: For installation in a front panel.
Current transformers: Suitable for currents up to 2,400 A, with 1 A or 5 A secondary current. For Pav,e monitoring, a minimum accuracy class of 1 is required. Examples include ZIEHL AS and WS series current transformers.
Example model: CTM7 61/1A, accuracy class 1, 0.5 VA.
7. Safety and Liability Statement (Original Page 4)
The wiring diagrams in this manual are provided for illustrative purposes only. The manufacturer accepts no liability for errors resulting from incorrect operation or wiring.
Work involving this product may only be performed by qualified personnel familiar with its installation, commissioning and operation.
The safety instructions in the operating manual must be strictly observed.