CU1 Datasheet, PDF (1/2 Pages) Allen-Bradley – Timing Control Units

Safety Relays
Timing Control Units
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)
Approvals
C-Tick, CE marked for all
applicable directives, cULus & TÜV
Power Supply
24V AC/DC, 110/230V AC
Power Consumption
<4VA
Inputs
1 N.C.
Maximum Input Resistance
500 Ω
Reset
Automatic/manual
Outputs
2 N.O. Safety
1 N.C. Auxiliary
➊ Output Utilization per IEC
60947-5-1 (Inductive)
B300, AC-15
4A/250V AC, 4A/125VAC
P300, DC-13; 3A/24V DC
Thermal Current (non switching) 2x4A
Timed Off-Delay
0.1s to 40min.
Fuses Input (external)
Output (external)
500mA time lag
5A quick acting
Max. Switched Current/Voltage 10mA/10V
Indication LED
Red = Power on
Red/Green = Timing/Output on
Impulse Withstand Voltage
2500V
Operating Temperature
-10°C to +55°C (+14°F to +131°F)
Humidity
90% RH
Enclosure Protection
IP40 DIN 0470
Terminal Protection
IP20 DIN 0470
Conductor Size
1 x 2.5mm² (14AWG) stranded
1 x 4mm² (12AWG) solid
Installation Group
C in accordance with VDE 0110
Pollution Degree
3
Torque Settings—terminal
screws
1N⋅m (8 lb⋅in)
Case Material
Red Polycarbonate
Mounting
35mm DIN rail
Weight
360g (0.79lbs)
Electrical Life
220V AC/4A/880VA/cosϕ=3.5
220V AC/1.7A/375VA/cosϕ=0.6
30V DC/2A/60W
10V DC/0.01/0.1W
100,000 operations
500,000 operations
1,000,000 operations
2,000,000 operations
Mechanical Life
2,000,000 operations
Vibration
0.75mm(0.03in) peak, 10-55Hz
Shock
30g, 11ms half-sine
➊ See Output Ratings on page 1-29 for details. Consult factory for ratings not
shown.
4-62