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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

➊ See Output Ratings on page 1-29 for details. Consult factory for ratings not

shown.

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

Installation Group

C in accordance with VDE 0110

Pollution Degree

3

Torque Settings—terminal

screws

1N

Case Material

Red Polycarbonate

Mounting

35mm DIN rail

Weight

360g (0.79lbs)

Electrical Life

220V AC/4A/880VA/cos

ϕ=3.5

220V AC/1.7A/375VA/cos

ϕ=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