Datalogic SE-SR2 Safety Relay
The Datalogic SE-SR2 is a safety relay designed to provide a safety-related interruption of a safety circuit. It complies with EN 60947-5-1, EN 60204-1, and VDE 0113-1, making it suitable for applications involving light grids.
Function Description
The SE-SR2 relay ensures safety by providing a dual-channel, redundant input circuit with built-in self-monitoring. Upon supply voltage, the "POWER" LED illuminates, and the unit becomes ready for operation when the start circuit (S12-S34) is closed.
When the input circuit is closed (e.g., an uninterrupted light grid), the "CH.1" and "CH.2" LEDs light up. Safety contacts 13-14, 23-24, and 33-34 close, while the auxiliary contact 41-42 opens, indicating the unit is active. If the input circuit opens (e.g., a light grid interruption), the "CH.1" and "CH.2" LEDs extinguish. The safety contacts 13-14, 23-24, and 33-34 open redundantly, and the auxiliary contact 41-42 closes.
The device detects earth faults in both the start and input circuits, as well as short circuits within the input circuit. The correct opening and closing of the safety function relays are automatically tested in each on-off cycle. The safety function remains effective even in the event of a component failure.
The SE-SR2 supports various operating modes:
- Automatic start: The unit becomes active once the input circuit is closed.
- Manual start without control: The unit becomes active once both the input circuit and the start circuit are closed.
- Manual start with control: The unit becomes active once the input circuit is closed and the start circuit is closed after a waiting period has elapsed.
The number of available contacts can be increased by connecting contact expander modules or external contactors/relays.
Important Technical Specifications
Electrical Data:
- Supply Voltage: 24 V DC
- Voltage Tolerance: -15% / +10%
- Output of External Power Supply (DC): 2 W
- Residual Ripple DC: 160%
- Duty Cycle: 100%
- Max. Inrush Current Impulse (A1): 1.7 A
- Pulse Duration (A1): 3.3 ms
Inputs:
- Number: 2
- Voltage at Input/Start/Feedback Loop DC: 24 V
- Current at Input DC: 30 mA
- Current at Start/Feedback Loop DC: 60 mA
- Max. Overall Cable Resistance (Rlmax) for Dual-channel without detection of shorts across contacts at UB DC: 80 Ohm
Relay Outputs:
- Number of Safety Contacts (N/O), instantaneous: 3
- Number of Auxiliary Contacts (N/C), instantaneous: 1
- Max. Short Circuit Current (IK): 1 kA
- Contact Material: AgSnO2 + 0.2 µm Au
Utilisation Category (EN 60947-4-1):
- Safety Contacts (AC1 at 240V): 0.01 A (min), 6 A (max), 1500 VA (max power)
- Safety Contacts (DC1 at 24V): 0.01 A (min), 6 A (max), 150 W (max power)
- Auxiliary Contacts (AC1 at 240V): 0.01 A (min), 6 A (max), 1500 VA (max power)
- Auxiliary Contacts (DC1 at 24V): 0.01 A (min), 6 A (max), 150 W (max power)
Utilisation Category (EN 60947-5-1):
- Safety Contacts (AC15 at 230V): 3 A (max current)
- Safety Contacts (DC13 at 24V, 6 cycles/min): 4 A (max current)
- Auxiliary Contacts (AC15 at 230V): 3 A (max current)
- Auxiliary Contacts (DC13 at 24V, 6 cycles/min): 4 A (max current)
Times:
- Switch-on Delay (Automatic start typ./max.): 200 ms / 400 ms
- Switch-on Delay (Manual start typ./max.): 100 ms / 400 ms
- Switch-on Delay (Monitored start typ./max.): 30 ms / 50 ms
- Delay-on De-energisation (E-STOP typ./max.): 10 ms / 20 ms
- Delay-on De-energisation (Power failure typ./max.): 70 ms / 120 ms
- Recovery Time (After E-STOP): 50 ms
- Recovery Time (After Power Failure): 150 ms
- Waiting Period with Monitored Start: 200 ms
- Min. Start Pulse Duration with Monitored Start: 30 ms
- Supply Interruption before De-energisation: 20 ms
- Simultaneity, Channel 1 and 2 max.: 8
Environmental Data:
- Ambient Temperature Range: -10 to 55 °C
- Storage Temperature Range: -40 to 85 °C
- Humidity: 93% r.h. at 40 °C (not permitted for condensation during operation)
- Protection Type (Housing): IP40
- Protection Type (Terminals): IP20
- Protection Type (Mounting Area): IP54
Mechanical Data:
- Dimensions (Height x Width x Depth): 94 mm x 22.5 mm x 121 mm
- Weight: 180 g
- Mechanical Life: 10,000,000 cycles
- Connection Type: Screw terminal
- Mounting Type: Plug-in
- Conductor Cross Section (flexible): 0.25 - 2.5 mm² (24 - 12 AWG)
- Conductor Cross Section (flexible with crimp connectors): 0.25 - 1 mm² (24 - 16 AWG)
- Conductor Cross Section (flexible without crimp connectors or with TWIN crimp connectors): 0.2 - 1.5 mm² (24 - 16 AWG)
- Torque Setting with Screw Terminals: 0.5 Nm
Safety Characteristic Data (EN ISO 13849-1:2015, EN 62061, IEC 61511):
- PL: PL e
- Category: Cat. 4
- SIL CL: SIL CL 3
- PFHD [1/h]: 2.31E-09
- SIL: SIL 3
- PFD: 2.03E-06
- TM [year]: 20
The PFH value depends on the switching frequency and the load on the relay output. If service life graphs are not accessible, the stated PFH value can be used irrespective of the switching frequency and the load, as it already considers the relay's B10d value and the failure rates of other components.
Usage Features
- Positive-guided relay outputs: Includes 3 instantaneous safety contacts (N/O) and 1 instantaneous auxiliary contact (N/C).
- Connection options: Supports start buttons and light grids.
- LED display: Provides visual indication for supply voltage and the switch status of the safety contacts.
- Galvanic isolation: No galvanic isolation between UB and the input circuit.
- Plug-in connection terminals: Facilitates easy installation and removal.
- Installation: Designed for installation in a control cabinet with a protection type of at least IP54. It can be attached to a 35mm DIN rail using a notch on the rear. For vertical installation, a fixing element (e.g., retaining bracket or end angle) is recommended.
- Wiring: Information in the "Technical details" section must be followed. Outputs 13-14, 23-24, 33-34 are safety contacts, while 41-42 is an auxiliary contact (e.g., for display) and should not be used for safety circuits. A fuse must be connected before the output contacts to prevent contact welding.
- Cable length calculation: The maximum cable length (Imax) in the input circuit can be calculated using the formula: Imax = Rimax / R₁/km, where Rimax is the max. overall cable resistance and R₁/km is the cable resistance/km.
- Wire type: Use copper wire that can withstand 60/75 °C.
- Load considerations: Avoid switching low currents with contacts previously used for high currents. Ensure sufficient fuse protection for all output contacts with capacitive and inductive loads.
- Power supply: The power supply must comply with regulations for extra low voltages with protective electrical separation (SELV, PELV) in accordance with VDE 0100, Part 410.
- EMC compliance: Ensure wiring and EMC requirements of EN 60204-1 are met. The product is designed for industrial environments; if installed elsewhere, measures should be taken to comply with applicable standards and directives regarding interference.
- Overvoltage category III: If voltages higher than low voltage (>50 VAC or >120 VDC) are present, connected control elements and sensors must have a rated insulation voltage of at least 250 V.
Maintenance Features
- Status indicators: LEDs (POWER, CH.1, CH.2) indicate the status and errors during operation.
- POWER LED: Indicates supply voltage presence.
- CH.1 LED: Indicates safety contacts of channel 1 are closed.
- CH.2 LED: Indicates safety contacts of channel 2 are closed.
- Fault detection:
- Earth fault: Supply voltage fails, safety contacts open. After rectifying the fault and switching off the supply voltage for approximately 1 minute, the unit is ready for operation.
- Contact malfunctions: If contacts have welded, reactivation is not possible after the input circuit has opened.
- No supply voltage/short circuit: The "POWER" LED will not light up.
- Regular safety checks: The safety function should be checked after initial commissioning and every time the plant/machine is changed, by qualified personnel.
- Relay output checks: When relay outputs are switched on, the mechanical contact on the relay cannot be tested automatically. Measures to detect non-opening of switching elements may be required depending on the operational environment.
- Safety contact verification: To comply with the European Machinery Directive, ensure safety contacts on relay outputs open correctly. Restart the device or open the safety contacts (switch off output) to allow internal diagnostics to check correct opening.
- For SIL CL 3/PL e: Check at least once per month.
- For SIL CL 2/PL d: Check at least once per year.
- Service life graphs: The service life graphs indicate the number of cycles from which failures due to wear must be expected, primarily caused by electrical load. It is essential to consider these graphs, as the relay outputs' safety-related characteristic data is only valid if the values in the service life graphs are met.
- Increasing service life: To increase service life, provide sufficient spark suppression on all relay contacts. For capacitive loads, note any power surges. For DC contactors, use flywheel diodes for spark suppression.
- Plug-in terminal removal: Terminals can be removed by inserting a screwdriver into the housing recess behind the terminal and leveraging it out. Do not remove terminals by pulling cables.
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