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RSMD-CM Technical Guide
LCD SCREENS
Alarms Screens
Alarms Screen
If an alarm is present, the ALARM LED above the LCD display
will light up red and blink. The Alarms will display and scroll
automatically from the ALARMS screen when alarms are present.
The alarms are as follows:
NO ALARMS:
This will be shown if there are no current alarms.
EBUS SLAVE (SLV) TIMEOUT:
This alarm indicates that
communication has been lost between the RSMD-CM and the
Main controller or other E-BUS modules that may be connected.
This can be the result of a bad cable, a missing cable, or the
module not being configured properly.
NO SUCTION PRESSURE TRANSDUCER 1 (SUCT1)
DETECTED:
This alarm indicates the Suction Pressure Transducer
1 is not detected by the system. There is no compressor failure
from this alarm. The failure will be unsafe suction pressure.
NO SUCTION PRESSURE TRANSDUCER 2 (SUCT2)
DETECTED:
This alarm indicates the Suction Pressure Transducer
2 is not detected by the system. There is no compressor failure
from this alarm. The failure will be unsafe suction pressure.
NO HEAD PRESSURE TRANSDUCER 1 (HEAD1) DETECTED:
This alarm indicates the Head Pressure Transducer 1 is not
detected by the system. This will cause the condenser fan/valve
to go to 100%.
NO HEAD PRESSURE TRANSDUCER 2 (HEAD2) DETECTED:
This alarm indicates the Head Pressure Transducer 2 is not
detected by the system. This will cause the condenser fan/valve
to go to 100%.
HIGH HEAD PRESSURE 1 (HP1) DETECTED:
This alarm
indicates when the Head Pressure 1 rises above 550 psig. This
will cause the condenser to go to 100%.
HIGH HEAD PRESSURE 2 (HP2) DETECTED:
This alarm
indicates when the Head Pressure 2 rises above 550 psig. This
will cause the condenser to go to 100%.
LOW SUCTION PRESSURE 1 (SP1) FAILURE:
This alarm will
occur if Suction Pressure 1 stays below the Low Suction Pressure
Setpoint for one minute or falls below 40 psi for five seconds.
This alarm will shut down the system. Power must be cycled to
clear the alarm.
LOW SUCTION PRESSURE 2 (SP2) FAILURE:
This alarm will
occur if Suction Pressure 2 stays below the Low Suction Pressure
Setpoint for one minute or falls below 40 psi for five seconds.
This alarm will shut down the system. Power must be cycled to
clear the alarm.
LOW SUCTION PRESSURE 1 (SP1) DETECTED:
This alarm
will occur if Suction Pressure 1 falls below the Low Suction
Pressure Setpoint for 20 seconds. The system will try to protect
itself by lowering compressor modulation percentage.
LOW SUCTION PRESSURE 2 (SP2) DETECTED:
This alarm
will occur if Suction Pressure 2 falls below the Low Suction
Pressure Setpoint for 20 seconds. The system will try to protect
itself by lowering compressor modulation percentage.
COMPRESSOR 1 (COMP1) HPS FAULT:
This alarm occurs if the
relay is energized and the binary input is energized but the binary
input de-energizes within the first 15 minutes of the compressor
call. The module allows four retries but locks out on the fifth
fault. This sequence is intended to help the startup of units with
microchannel coils and prevent nuisance lockouts when the coil is
cold. If a fault occurs after the first 15 minutes of the compressor
call, the module will allow one retry, and will lock out if another
fault occurs within two hours. If any faults have occurred, but
the module is not locked out, the fault counter will reset to zero
if the RSMD-CM goes to Off Mode OR the compressor has run
successfully for two hours since the last fault.
COMPRESSOR 1 (COMP1) FAULT:
If the relay energizes but the
binary input never energizes, this alarm occurs if the compressor
fails to run 45 seconds after the relay is activated. This causes an
alarm and de-energizes the compressor enable relay. The system
will retry after five minutes.
COMPRESSOR 2 (COMP2) FAULT (if wired in tandem):
If the
relay energizes but the binary input never energizes: This alarm
occurs if the compressor fails to run 45 seconds after the relay is
activated. This causes an alarm and shuts down the compressor
(relay). The system will retry after five minutes.
COMPRESSOR 2 (COMP2) HPS FAULT (if not in tandem):
If
the relay is energized and the binary input is also energized: If
the binary input de-energizes within the first 15 minutes of the
compressor call, the module will allow four retries, and will lock
out on the fifth fault. This sequence is intended to help the startup
of units with microchannel coils and prevent nuisance lockouts
when the coil is cold. If a fault occurs after the first 15 minutes
of the compressor call, the module will allow one retry, and will
lock out if another fault occurs within two hours. If any faults
have occurred, but the module is not locked out, the fault counter
will reset to zero if the RSMD-CM goes to Off Mode OR the
compressor has run successfully for two hours since the last fault.
ALARMS
Summary of Contents for RSMD-CM
Page 1: ...RSMD CM Technical Guide ...
