Laird Controls North America Inc. 818A ユーザーズマニュアル
Command Pro Engineered Systems
User Manual
User Manual
37
142134
7.5 Receiver Troubleshooting
7.5.1 General
, and
The 21R14A, 21R22, and the 22R08A have diagnostic LEDs plus a LED for each output relay to aid in isolating
a problem if one occurs. The 22R08A and 21R14A receivers have ‘OUTPUT’, ‘SIGNAL’ and ‘POWER’
diagnostic LEDs on the front of the receiver case. The 21R14A and 22R08A series use a single circuit board for
the receiver and decoder. The 21R22 receiver has ‘SIGNAL’ and ‘POWER’ diagnostic LEDs on the front of the
receiver case and it uses a RF/Decoder board and a Relay board.
The following table describes the diagnostic LEDs.
The following table describes the diagnostic LEDs.
LED
Indication
POWER
Receiver operating voltage is present.
Signal
Output
A signal is being received that matches the decoder’s
address.
SIGNAL
OUTPUT
OUTPUT
Also may indicate scanning mode in receivers with scanning
function (except 21R22).
SCAN 1 through SCAN 3
(21R22 only)
These LEDs cycle while receiver is scanning.
When on steady, indicates which frequency receiver is
When on steady, indicates which frequency receiver is
locked onto.
K1 through Kxx
Corresponding relays are energized.
When the 21R22 is not receiving a valid signal, an OFF relay pulls in, which ensures that power is removed
from the mainline contactor on the crane.
When the receiver is receiving a signal in normal operating mode, the OPR relay drops out and the MLC
When the receiver is receiving a signal in normal operating mode, the OPR relay drops out and the MLC
relay pulls in, allowing the main contactor on the crane to energize.
Note the 21R14A uses one MLC relay.
Note the 21R14A uses one MLC relay.
7.6 Receiver Testing
Note: Before testing, we recommend isolating power to the crane and that all tag/lockout procedures
applicable to your facility are applied.
Follow these steps when troubleshooting the Command Pro receivers.
1. Check the POWER indicator. If POWER is not illuminated:
a. Make sure the power switch on the right side of the receiver cabinet is in the ON position.
b. Check for AC input power between terminals X1 (X1/+DC-SW for R14A) and X2 of the
b. Check for AC input power between terminals X1 (X1/+DC-SW for R14A) and X2 of the
terminal strip. If AC power is present and the POWER on LED is not on, the problem may
be in the Relay board.
be in the Relay board.
2. Ensure the transmitter is OFF.
a. Switch the receiver power switch off and then on. If no indicators come on after 1 second,
the microprocessor circuits are possibly defective. The RF/Decoder board may also be
defective.
defective.