Safety Relays Timing Control Units CU4 Specifications Description The CU4 is an off-delay timing unit which can be operated standalone or as an extension of a host relay. The timed outputs are used in applications where power must be maintained for a fixed duration after an input signal is received. For example, driving a power to lock TLS2-GD2 to maintain a guard door in the locked position for a fixed duration after a stop button is pressed. Another example would be maintaining the connection of a drive to a motor until the braking function is achieved, and then dropping out a contactor to remove power to the motor. The inputs can be connected in either a single channel or dual channel configuration. The inputs must remain closed during the complete timing cycle. Opening the contacts before the timing cycle completes causes the timer to be reset to zero. The CU4 has a redundant structure with two independent safe timer circuits. The outputs include two normally open safety delayed outputs as well as one normally closed safety output. The safety outputs have independent and redundant internal contacts to help ensure the safety function. When used an extension of a host relay, the normally closed contacts should be used in the feedback loop of the host relay. If used in standalone application, the normally closed contacts can be used to signal an auxiliary device or PLC. A typical operation starts with power applied to A1/A2 and the input circuits open. 1. Close the B11/B12 and B21/B22 circuits. a. The safety outputs (17/18 and 27/28) close immediately. 2. Open the B11/B12 or B21/B22 circuits. a. The timing process starts. b. The safety outputs (17/18 and 27/28) open after the time expires. 3. Go to Step 1. Features • • • • • • Category 3 per EN 954-1 Stop category 1 Timed off-delay 0.15s to 30s 2 Safety contacts 1 Auxiliary contact 1 Monitoring contact 4-64 Standards EN 954-1, ISO 13849-1, IEC/EN 60204-1, IEC 60947-5-1, ANSI B11.19, AS4024.1 Category Cat. 3 per EN 954-1 (ISO13849-1) Approvals C-Tick, CE marked for all applicable directives, cULus and BG Power Supply 24V AC/DC, 50/60 Hz 0.85 to 1.1 x rated voltage Power Consumption 2.5W Safety Inputs 1 N.C. or 2 N.C. Input Simultaneity Infinite Outputs 2 N.O. Safety; 1 N.C. Auxiliary ➊ Output Utilization per IEC 60947-5-1 (Inductive) B300 AC-15 5A/250V AC, 5A/125V AC N300 DC-13 3A/24V DC Timed Off-Delay 0.15 to 30s Fuses Output External 6A Slow Blow or 10A Quick Blow Min. Switched Current/Voltage 10mA/10V Contact Material Ag Sn O2/0.5µ Au Response Time 30msec Indication LEDs Green = Power Green =CH t1 Active Green = CH t2 active Impulse Withstand Voltage 2500V Pollution Degree 2 Operating Temperature -5°C to +55°C (+23°F to 131°F) Humidity 90% RH Enclosure Protection IP40 (NEMA 1) Terminal Protection IP20 Maximum Conductor Size 0.2–4mm2 (24-12AWG) Torque Settings—terminal screws 0.4Nm (3.54lb²in) Mounting 35mm DIN rail Weight 165g (0.36lbs) Electrical Life 220V AC/4A/880VA cosϕ=0.35 220V AC/1.7A/375VA cosϕ=0.6 30V DC/2A/60W 10V DC/0.01A/0.1W 100,000 operations 500,000 operations 1,000,000 operations 2,000,000 operations Mechanical Life 2,000,000 operations Vibration 10-55 Hz, 0.35mm Shock 10g, 16ms, 100 shocks ➊ See Output Ratings on page 1-29 for details. Consult factory for ratings not shown. Safety Relays Timing Control Units CU4 Product Selection Inputs Safety Outputs Auxiliary Outputs 1 N.C. or 2 N.C. 2 N.O. 1 N.C. Timing Range Catalogue Number 0.15 – 3s 440R-S23173 0.5 – 10s 440R-S23174 1.5 – 30s 440R-S23175 Dimensions—mm (inches) Block Diagram 22.5 (0.88) A1 35 75.0 (2.95) 17 B11 17 27 27 B12 35 18 28 B21 28 36 B22 A2 110 (4.33) K1 K2 36 18 Typical Wiring Diagrams E-Stop A1 S11 S12 S21 S22 S23 X2 13 23 33 43 53 L1 L2 L3 81 A1 B11 B21 17 27 35 A1 Aux Circuit Aux Circuit +24V DC Solenoid 54 42 K1 MSR124RT A2 PE Y1 Y2 X5 X6 X1 14 24 34 44 54 M 82 A2 CU4 K2 A2 B12 B22 18 41 12 28 36 11 53 22 34 21 33 Reset K1 K2 TLS2-GD2 Power to Lock Ground Dual Channel Wiring to CU4 Inputs E-Stop A1 S11 S12 S21 S22 S23 X2 13 23 33 43 53 L1 L2 L3 81 A1 B11 B21 17 27 35 A1 K1 MSR124RT A2 PE Y1 Y2 X5 X6 X1 14 24 34 44 54 82 A2 CU4 K2 M A2 B12 B22 18 Solenoid 36 54 42 41 12 28 Aux Circuit Aux Circuit +24V DC 11 53 22 34 21 33 Reset K1 K2 TLS2-GD2 Power to Lock Ground Single Channel Wiring to CU4 Inputs 4-65