Omron H3CR-A 11-Pin Multi-Mode Timer with Input

H3CR-A: 11-pin eight-mode timer with external signal inputs

The Omron H3CR-A is the full-featured 11-pin multifunctional timer of the H3CR family. Where the 8-pin H3CR-A8 starts only on power-up, the H3CR-A adds a no-voltage (NPN-type) input for start, reset and gate signals and offers eight operating modes in a DIN 48 x 48 mm case. Seven Star LLC supplies the H3CR-A in Oman and the GCC as an independent supplier in Muscat; this page decodes the part number and lists the points to settle before ordering.

• H3CR-A is the multifunctional timer type with eight selectable modes.
• No digit before the next letter means an 11-pin socket form; an 8 would give the 8-pin version.
• No P means a no-voltage input (NPN type). H3CR-AP is the voltage-input (PNP) form.
• No S or E means a DPDT relay output as the time-limit contact.
• A -301 suffix selects the double time scale of 0.1 s to 600 h; the supply voltage is added at order, for example 100-240AC/100-125DC or 24-48AC/12-48DC.

The extra inputs are what make the H3CR-A the preferred timer when sequencing depends on field signals such as a limit switch, a sensor or a PLC relay contact, instead of on the supply alone.

H3CR-A technical specifications

Values are taken from the Omron H3CR datasheet. Input levels apply to the no-voltage input; if your control signal is a 24 VDC or mains-level voltage, the H3CR-AP is the matching model rather than the H3CR-A.

How H3CR-A handles timing

The H3CR-A counts time with a microcomputer and supports two kinds of operation. In power-start modes (A, B, B2, E, J) the cycle begins when supply is applied. In signal-start modes (C, D, G) the input terminals trigger the delay while the supply stays on, so the timer can be part of a machine sequence.

Mode C and G both give signal ON/OFF-delay behaviour, with the output following the input after a delay at each edge, while D delays only the output drop. The no-voltage input is an open-contact or open-collector input referenced to the timer, which is why a clean dry contact or NPN transistor is the correct source. Power can be removed for 0.1 s or more to reset, and a start pulse as short as 0.05 s is recognised.

The time unit and full-scale knobs combine to give 24 ranges on standard 0.05 s to 300 h models. Turning the set value below zero until the stop makes the output act instantly, which is a quick way to check wiring and sequence without waiting for a long time range to run out.

Sockets, accessories and related timers for H3CR-A

In an 11-pin installation the H3CR-A can be exchanged with the voltage-input H3CR-AP, the transistor-output H3CR-AS, or the -301 double-range version without changing the cut-out, though wiring of the input terminals differs between the NPN and PNP types. The 8-pin siblings H3CR-A8 and H3CR-A8E use different sockets. Sockets for the 11-pin form are listed below.

Accessories listed for the family include the Y92F-30, Y92F-73 and Y92F-74 flush-mounting adapters, the Y92A-48B protective cover, Y92H-7 and Y92H-8 hold-down clips, Y92S-27 and Y92S-28 setting rings, Y92P-48GL and Y92P-48GB panel covers, and the Y92A-48G terminal cover for back-connecting screw sockets. The protective cover and flush adapters cannot be combined with the panel cover, so settle the front-panel arrangement before ordering.

Selection and ordering checklist for H3CR-A

Use this list before you send an enquiry for H3CR-A. Omron orders timers by model plus supply voltage, so the voltage is part of the order and cannot be added later.

• List the control signals that must start, reset or gate the timer; if none exist, the cheaper 8-pin H3CR-A8 may be enough.
• Confirm that the signal source is a dry contact or NPN output. A voltage signal needs H3CR-AP.
• Decide on the time range: 0.05 s to 300 h or the -301 range of 0.1 s to 600 h.
• Select the supply band: 100 to 240 VAC / 100 to 125 VDC or 24 to 48 VAC / 12 to 48 VDC.
• Check relay load against 5 A at 250 VAC and the 10 mA at 5 VDC minimum.
• Choose an 11-pin socket: P2CF-11 for front DIN-rail use or P3GA-11 for back connection, and the finger-safe -E version if required.

Installation, commissioning and maintenance of H3CR-A

Mount the H3CR-A in its 11-pin socket and route the signal wiring separately from power. Terminals 5, 6 and 7 are assigned to the input functions on this model, so check the datasheet terminal diagram before connecting a sensor or a PLC contact.

• Select the operating mode first and confirm the timing chart for that mode in the datasheet.
• Verify the input with a simple dry contact before connecting field instruments.
• Where a 2-wire AC proximity sensor is used as signal source, consult the Omron guidance, as leakage current can falsely hold the input.
• Use the zero-set check to prove the output wiring, then set the real delay.
• Record the dial settings on the panel documentation, since timers are often changed during commissioning and rarely logged.

Typical H3CR-A applications in Oman and the GCC

The H3CR-A is a common choice for gated sequences in packaged skids: star-delta changeover supervision, pump seal-flush delays released by a run signal, and conveyor stagger starts controlled from a limit switch. In water treatment and desalination plants it is also used for chemical dosing pulses that must follow a running signal from a duty pump.

In Gulf industrial sites the timer is generally mounted in air-conditioned control rooms or sealed field cabinets. Dust-laden air, high humidity near the coast and inverter-driven plant all raise the importance of clean supply wiring and tight sockets for the 11-pin form. Where plant electricians change settings during shutdowns, a protective cover over the front dial prevents accidental changes caused by vibration or curious hands, and a small label showing the mode letter, time unit and full-scale value saves repeat commissioning visits later. Spares should be kept in sealed bags with desiccant, because stored electronics in humid coastal warehouses deteriorate faster than most buyers expect. It is also sensible to keep the original packaging, which carries the model and voltage marking, until the unit is installed so that the correct version can be traced if a panel drawing and the delivered item ever disagree.

H3CR family compared with H3CR-A

The table places H3CR-A next to the other timers in the same H3CR catalogue so you can confirm that you are asking for the right base model before the voltage is added.

Information to send with an RFQ for H3CR-A

• Part number H3CR-A, quantity and supply voltage.
• Which of modes A, B, B2, C, D, E, G or J you intend to use.
• Required time range and whether -301 is wanted.
• Signal source type connected to the input.
• Output load voltage and current.
• Socket requirement and delivery location.

Documents and quotation

A datasheet for the H3CR series is attached on this page, covering the model legend, time ranges, ratings, timing charts, dimensions and safety precautions for H3CR-A and its siblings. Please read the precautions section before wiring.

Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer. Send the part number H3CR-A, the supply voltage and the quantity, and we will confirm availability and lead time for Oman and the GCC.