Carrier AquaSnap 30RAP011-060 Controls, Start-Up, Operation, Service, And Troubleshooting page 90

Alert will reset after 30 minutes and the M2-M1 contacts will
close if the resistance of the motor PTC circuit is back in the
normal range. The module will lock out the compressor if the
trip condition exists for longer than 6 hours. Once the module
has locked out the compressor, a power cycle will be required
to clear the lockout.
• Code 3 – Short Cycling: The module will flash the red Alert
LED 3 times indicating the compressor is locked out due to
short cycling. A Code 3 Alert will open the M2-M1 con-
tacts. Code 3 will be enabled when the Short Cycling DIP
switch (no. 10) is ON (in the up position) and the compres-
sor has exceeded the number of short cycles configured by
the user in a 24-hour period. Once the module has locked
out the compressor, a power cycle will be required to clear
the lockout.
• Code 4 – Scroll High Temperature: The module will flash
the red Alert LED 4 times indicating the scroll NTC circuit
is less than 2400 . A Code 4 Alert will open the M2-M1
contacts. The Alert will reset after 30 minutes and the M2-
M1 contacts will close if the resistance of the scroll NTC
circuit is higher than 5100 . The module will lock out the
compressor if the number of Code 4 Alerts exceeds the user
configurable number of Code 4 events within a 24-hour
period. Once the module has locked out the compressor, a
power cycle will be required to clear the lockout.
• Code 5 – Not used.
• Code 6 – Missing Phase: The module will flash the red
Alert LED 6 times indicating a missing phase in one of the
three leads to the compressor. A Code 6 Alert will open the
M2-M1 contacts. The Alert will reset after 5 minutes and
the M2-M1 contacts will close if the missing phase condi-
tion is not present. The module will lock out the compressor
after 10 consecutive Code 6 Alerts. Once the module has
locked out the compressor, a power cycle will be required to
clear the lockout.
• Code 7 – Reverse Phase: The module will flash the red
Alert LED 7 times indicating a reverse phase in two of the
three leads to the compressor. A Code 7 Alert will open the
M2-M1 contacts. The module will lock out the compressor
after one Code 7 Alert. A power cycle will be required to
clear the lockout.
• Code 8 – Not used.
• Code 9 – Module Low Voltage: The module will flash the
red Alert LED 9 times indicating low module voltage, less
than 18 vac on the T2-T1 terminals for more than 5 seconds.
A Code 9 Alert will open the M2-M1 contacts. The Alert
will reset after 5 minutes and the M2-M1 contacts will close
if the T2-T1 voltage is above the reset value in 18 to 30 vac.
Resetting Alert codes can be accomplished manually by cycling
power to the module (disconnect T2 or T1 for 5 seconds). If the
fault that initiated the Alert code is absent after the reset is per-
formed, the Alert code will be cleared and CoreSense module will
allow normal operation. If the fault is still present after the reset is
performed, the fault code will continue to be displayed via the
green or red flashing LED.
Troubleshooting procedures described for the Kriwan module sec-
tion (page 86) are applicable to the CoreSense communication
module.
Copeland replacement compressors are shipped with two solid-
stage motor protection modules. A 120/240-volt module is in-
stalled and a 24-volt module is shipped with the compressor. The
30RAP units require the 24-volt module be field installed. Failure
to install the 24-volt module will result in a compressor failure
alarm. See Fig. 69.
LEDS
DIP SWITCHES
1 2 3 4 5 6 7 8 9 10
T2 T1
MODULE
POWER
Fig. 69 — Solid-State Motor Protection Module
Danfoss Electronic Module Replacement of Kriwan Motor
Protection Module
The Kriwan module has been replaced by the Danfoss communi-
cation module for motor protection on all Danfoss compressors.
Motor Overheating and Overloading — The motor protector
comprises a control module and PTC sensors embedded in the
motor winding. The close contact between thermistors and wind-
ings ensures a very low level of thermal inertia.
The motor temperature is constantly measured by a PTC thermis-
tor loop connected on S1-S2. If the thermistor exceeds its response
temperature, its resistance increases above the trip level (4,500 )
and the output relay then trips; i.e., contacts M1-M2 are open. Af-
ter cooling to below the response temperature (resistance < 2,750
), a 5-minute time delay is activated.
After this delay has elapsed, the relay is once again pulled in; i.e.,
contacts M1-M2 are closed. The time delay may be canceled by
means of resetting the mains (L-N-disconnect) for approximately
5 seconds.
A red/green twin LED is visible on the module. A solid green
LED denotes a fault-free condition. A blinking red LED indicates
an identifiable fault condition. See Fig. 70 and 71.
Fig. 70 — PTC Overheat
90
MOTOR THERMAL
SENSORS
R
JUMPER
G
COMMUNICATION
PORT
M2 M1
L1 L2 L3
CONTROL CIRCUIT
CONNECTIONS
COMPRESSOR PHASE
SENSING
A38-7314