Laird Controls North America Inc. 818A Manuale Utente
Command Pro Engineered Systems
User Manual
User Manual
14
142134
Multiple Receivers Controlled by Multiple Transmitters Option:
One transmitter can control a maximum
of six receivers with a rotary selector switch. A rotary switch is often used to select a particular hoist/trolley
A/both/B. It can also be used for crane select, i.e. East/West.
5.6 Status Indicators
5.6.1 Status LED
The status LED indicates the transmitter operation. When the transmitter is operating normally, the LED
indicator emits short flashes at a low rate when no commands activate, and at a higher rate when a
command activates. Some transmitters use a red LED only. Others use a multicolored LED that flashes GREEN
when no problems are present and changes to RED when problems are encountered. See Status Chart
below.
Table 1: Transmitter Status Chart
LED Indication
Possible Cause
LED is off.
Transmitter is off – switch transmitter ON.
Batteries are dead – replace batteries.
Transmitter failure – call for service.
Batteries are dead – replace batteries.
Transmitter failure – call for service.
LED flashes at low rate.
Transmitter is operating in a normal mode.
LED flashes at high rate.
Command Switch is pressed.
LED flashes Red/Green (‘A’
series only).
Batteries getting low. Change batteries at the next
convenient opportunity.
LED flashes on-off at a slow
rate (½ second on and ½
second off).
Batteries getting low. Change batteries at the next
convenient opportunity.
LED remains on
continuously (LED might
flicker slightly).
A switch was activated at the time the transmitter was
switched on, or a general failure occurred that requires
factory service. Ensure no other switches are pressed
while attempting to switch the transmitter on.
LED will not light when
ON/OFF button is pushed.
Replace batteries. If this does not correct the problem, the
transmitter must be repaired.
5.6.2 Function Select LEDs
Two LEDs are used on some transmitters to indicate which control functions are active (such as hoist trolley A
or hoist trolley B. These are commonly used with pilot relays). When both are illuminated, both controls are
active. When both LEDs go out, neither control is active.