Laird Controls North America Inc. 818A Manuale Utente

Command Pro Engineered Systems
User Manual

142134

OFF/STOP:

While depressed, this button sends a STOP command to the receiver. The transmitter does

not need to be actively ‘ON’ to send this command. When this switch is released, the transmitter switches

off.
AUTO OFF:

The transmitter switches itself off if no commands are sent for a predetermined time.

Normally this time is set to 15 minutes, but it may be programmed from 0 to 60 minutes, or disabled using a

RAC16 Series Programmer (01 to 60 = minutes, 00 = disabled).
Levers (21T34A/44A/74A) / Joysticks (21T54A):

When in the neutral (center) position, no commands send.

When a paddle moves from the neutral position, a command generates proportional to the amount of

movement (the further the lever is pushed, the faster the movement is commanded).
Push-to-Operate (PTO) Switch (Optional):

The PTO or ‘Dead Man Switch’ is a safety device. The

transmitters are normally programmed so that the switch that activates this function must be depressed

before any motor or other critical function can operate (consult the Configuration Sheet if this switch has an

alternate use in your system).
First-Come First-Serve (FCFS) (Optional): The First-Come First-Serve option allows use of multiple

transmitters with one receiver, one at a time. The receiver scans a preset list of ID Codes. When a valid signal

is received, the receiver stops scanning and responds only to that transmitter’s signal. When the signal is no

longer being received (that is, the transmitter has been switched off or is out of range), the receiver again

scans until another valid signal is received.
Pitch-and-Catch (Optional):

Pitch-and-Catch is similar to First-Come First-Serve but adds the safety

requirement that the operator in control must release or ‘pitch’ the control before another operator may

assume control. It also allows control transfer from one operator to another without pausing operation. Once

the transmitter has taken control of the receiver, the pitch button is the only way to release control of the

receiver so that other transmitters can take control. Once the receiver receives a valid pitch command, the

receiver then looks for the next programmed ID code. A Catch is made when the ID code from the next

transmitter is recognized. If a catch is not made within a pre-set time period, the receiver will revert to First-

Come First-Serve until a valid ID code is recognized. Any switch can be programmed as the pitch button.

Note: If a transmitter malfunctions after the receiver has taken control, the only way to release the

receiver is to cycle power to the receiver.

A- B Switch (Optional): Selector switches can be provided to control more than one similar function with

the same controls (i.e. controlling trolley/hoist A, trolley/hoist B, or both A and B simultaneously). On the

handheld transmitters, a single pushbutton cycles between A, B, Both, and OFF each time the button is

pressed. LED indicators show the control status.
Key Switch (Optional): The key switch option can prevent the use of the transmitter by unauthorized

personnel. The key switch is electrically connected between the battery and the electronics so that all power

is removed when the switch is in the OFF position.

Note: Once power is applied, the red LED illuminates and the transmitter performs a self-test procedure

lasting approximately three seconds. The transmitter may be switched to ‘ON’. Under standard

operating conditions, the LED flashes green once when the transmitter switches to ‘ON’.

Magnet Control (Optional):

An additional safety feature is built into systems that use a lifting magnet.

The two-button design uses one button labeled MAG LIFT (or LIFT) and one button labeled MAG DROP (or

DROP). Pressing the LIFT button energizes the magnet. Pressing LIFT and DROP at the same time de-

energizes the magnet and drops the load.
A time-delay is built into the circuit, so the buttons must be held for nearly one second before the magnetic

controls activate. An additional switch may be provided for fanning or dribbling the load. Pressing the button

labeled FAN or MAG FAN while pressing MAG LIFT activates the fan drop function. Again, a time-delay is

built into the circuit, so these buttons must be held down for nearly one second before the magnetic controls

activate.