CU1
|
Description
The CU1 is an on-delay timing unit designed to energize and thus unlock guard locking devices after a preset time delay expires. It can be used with power to unlock devices, like the Allen-Bradley Guardmaster Atlas, Spartan, 440G-MT, or TLS-GD2, on machines which have a run down cycle or do not stop immediately. It may also be incorporated into other parts of the safety related controls system, should a predictable, on-delay be required.
A removable cover allows access to the AC power switch, the replaceable fuse, and the DIP switches & potentiometer which control the timing. Power to the CU1 can be either 24V AC/DC (+/- terminals) or 110/230V AC (A1/A2 terminals). If 110V AC or 230V AC power is used, an internal switch must be set to the appropriate position.
The X1/X2 terminals are designed to monitor the performance of the contactors which isolate the power to the moving parts of the machinery. The timing can not begin until the X1/X2 loop is closed. The X1/X2 loop must remain closed during the whole timing cycle. Opening the X1/ X2 loop during the timing cycle causes the time to be reset to zero. If monitoring is not needed, the X1/X2 loop can be linked.
A typical operation starts with the safety outputs (13/14 and 23/24) open and the X1/X2 loop closed.
| 1. | Apply power to A1/A2 or +/-. | |
| a. | The Power LED turns ON and the Output LED turns red. | |
| b. | After the time delay expires, the Output LED turns green and the safety outputs (13/14 and 23/24) close. | |
| 2. | Remove power to A1/A2 or +/-. | |
| a. | Immediately, the safety contacts (13/14 and 23/24) open, the Power LED turns off and the Output LED turns Off. | |
| 3. | Go to step 1. | |
The status of the CU1 can be signaled to the Remote Indicator Unit via terminals R1/R2/R3, or to a PLC or other indicator by using the N.C. auxiliary contacts (31/32).
Features
- Category 1 per EN 954-1
- Stop category 1
- Timed on-delay output 0.1s to 40 min
- 2 N.O. safety outputs
Specifications
| Standards | EN 954-1, ISO 13849-1, IEC/EN 60204-1, IEC 60947-5-1, ANSI B11.19, AS4024.1 |
| Category | Cat. 1 per EN 954-1 (ISO13849-1) |
| Certifications | — |
| Power Supply | 24V AC/DC, 115V AC, or 230V AC |
| Power Consumption | <4 VA |
| Safety Inputs | 1 N.O. |
| Input Resistance, Max. | 500 W |
| Reset Type | Automatic/Manual |
| Safety Outputs | Delayed—3 N.O. Safety Delayed—2 N.C. Auxiliary |
| Output Utilization per IEC60947-5-1 (Inductive)¬ | B300, AC-15: 4 A/250V AC, 4 A/125V AC P300, DC-13: 3 A/24V DC |
| Thermal Current | 2 x 4 A, nonswitching |
| Time Range (Off-Delay) | 0.1s…40 min. |
| Fuses, Input | 500 mA time lag (external) |
| Fuses, Output | 5 A quick acting (external) |
| Switching Current @ Voltage, Max. | 10 mA/10V |
| Status Indicators | Red = Power on Red/Green = Timing/Output on |
| Rated Impulse withstand Voltage | 2500V |
| Operating Temperature [C (F)] | -10…55° (14…131°) |
| Relative humidity | 90% |
| Enclosure Type Rating | IP40, DIN 0470 |
| Terminal Protection | IP20 DIN 0470 |
| Conductor Size, Max. | 1 x 2.5 mm2 (14 AWG) stranded 1 x 4 mm2 (12 AWG) solid |
| Installation Group | C in accordance with VDE 0110 |
| Pollution Degree | 3 |
| Torque Settingste—terminal screws | 1 N•m (8 lb•in) |
| Housing Material | Red Polycarbonate |
| Mounting | 35 mm DIN Rail |
| Weight [g (lb)] | 360 (0.79) |
| Electrical Life | 220V AC/4A/880VA cosf = 3.5—100,000 operations 220V AC/1.7A/375VA cosf = 0.6—500,000 operations 30V DC/2A/60W—1,000,000 operations 10V DC/0.01A/0.1W—2,000,000 operations |
| Mechanical Life | 2,000,000 operations |
| Vibration | 0.75 mm (0.30 in) peak, 10…55 Hz |
| Shock | 30 g, 11 ms half-sine |
| ¬ See Output Ratings see Output Ratings for details. Consult factory for ratings not shown. | |
Product Selection
| Inputs | Safety Outputs | Auxiliary Outputs | Power Supply | Cat. No. |
| 1 or 2 N.O., 1 or 2 N.C., LC, 2 hand control, enabling switch | Delayed—3 N.O. | Delayed—2 N.C. | 24V AC/DC, 115V AC, or 230V AC | 440R-T07114 |
Accessories
| Description | Page Number | Cat. No. |
| 500 mA fuse—Bussmann Cat. No. ETF-500 mA | 440R-A31562 | |
| CU1 Remote Indication Unit | — | 440R-A07138 |
Approximate Dimensions
Dimensions are shown in mm (in.). Dimensions are not intended to be used for installation purposes.
|
Block Diagram
|
Typical Wiring Diagrams
|
Application Details
|
|
| DIP switches general time setting and the potentiometer fine tunes the time settings. Easy access 500mAT replaceable fuse. |