33
RSM-DEV1 Technical Guide
TROUBLESHOOTING
LED Diagnostics
Using RSM-DEV1 LEDs to Verify Operation
The RSM-DEV1 is equipped with LEDs that can be used to
verify operation and perform troubleshooting. There are LEDs for
communication, operation modes, and diagnostic codes. See
Figure
10, this page,
for the LED locations. The LEDs associated with these
inputs and outputs allow you to see what is active without using a
voltmeter. The LEDs and their uses are as follows:
Diagnostic LEDs
STATUS
- If the software is running, this LED should blink at a
rate of one blink per second.
ALARM (on board)
- If the RSM-DEV1 Module does not receive
communications for more than one minute, this LED lights up, the
relays turn off, and the analog outputs go to 0 VDC.
ALARM (above LCD display)
- This red LED lights up and stays lit
when there is an alarm present. The type of alarm displays on the
LCD display. The ALARM LED also blinks when the expansion
valve is initializing at startup.
COMM
- Every time the RSM-DEV1 Module receives a valid
E-BUS request from the VCCX2 Controller, this LED blinks on and
then off, signifying that it received a valid request and responded.
POWER
- This LED lights up to indicate that 24 VAC power has
been applied to the controller.
Binary Input LEDs
BIN1
- This green LED lights up when Compressor Status 1 input
has 24VAC present.
BIN2
- This green LED lights up when Compressor Status 2 input
has 24VAC present.
BIN3
- This green LED lights up when the Coil Temperature input
has 24VAC present.
BIN4
- This green LED lights up when the Emergency Shutdown
input has 24VAC present.
Relay LEDs
RLY1 - RLY4
- These green LEDs light up when the relays are
enabled and stay lit as long as they are active.
RSM-DEV1 Stepper Motor Valve LED
EXV-1
- This yellow LED blinks to indicate communication to
the Superheat Controller. If the LED is on solid, that indicates no
communication to the Superheat Controller.
EXV-2
- This yellow LED blinks to indicate communication to
the Superheat Controller. If the LED is on solid, that indicates no
communication to the Superheat Controller.
Figure 9: RSM-DEV1 LED Locations
BINARY
INPUT
EXV-1
STATUS
ALARM
COMM
POWER
RELAY
ALARM
EXV-2
ALARM
UP
DOWN
ENTER
MENU
AAON P/N: ASM07687
+24 V
AC
GND
RELA
Y CONT
ACT
RA
TING IS 1
AMP
MAX @ 24 V
AC
CONDENSER
COMP 1 ENABLE
COMP 2 / HI SPEED
ANALOG OUTPUTS
COMMON
RELAY OUTPUTS
LABEL P/N:
G149410
NOT USED
COND FAN
GND
24 VAC POWER ONLY
WARNING! POLARITY
MUST BE OBSERVED
OR THE CONTROLLER
WILL BE DAMAGED
REVERSING VALVE
+5 V
DISCHARGE TEMP 1
COMP STAT 1
SP
DISCHARGE TEMP 2
COMP STAT 2
GND
EMER SHDN
GND
NOT USED
GND
BINARY INPUTS
MODBUS
RSM-DEV1
www.aaon.com
SUCTION PRES
DUAL
E-BUS
EXP VALVE 1
+5 V
HP
GND
TXV COIL TEMP
NOT USED
GND
NOT USED
EXP VALVE 2
R+
T-
SH
SHD
T-
R+
SHD
T-
R+
EXP VALVE 3
NOT
INSTALLED
EXP VALVE 4
NOT
INSTALLED
EACH EXP VALVE IS INDIVIDUALLY
ELECTRICALLY ISOLATED
DEFROST SW
HEAD PRES
