CU4 Datasheet, PDF (1/2 Pages) Allen-Bradley – Timing Control Units

Safety Relays
Timing Control Units
CU4
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
Specifications
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.
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