Nominal Capacitor Value And Relays - Danfoss MLM Series Application Manuallines

A G
PPLICATION UIDELINES
CSR wiring
Nominal capacitor value and
relays
Compressor models
MLZ/MLM015
MLZ/MLM019-021-026
220-240 V /1/50 Hz
Motor voltage code 5
MLZ/MLM030
MLZ/MLM038-042
MLZ/MLM015
MLZ/MLM019-021
208-230 V / 1 / 60 Hz
MLZ/MLM026
Motor voltage code 1
MLZ/MLM030-033
MLZ/MLM038-042
E ,
LECTRICAL DATA CONNECTIONS AND WIRING
at high temperature and thus at high resistance
as long as power is connected to the compres-
sor. When the compressor is switched off , the PTC
cools down to its initial low resistance and be-
comes available to support the next compressor
start.
It is important to provide suffi cient time between
motor starts to allow the PTC to cool down close
to ambient temperature. Depending on the am-
bient conditions and the cooling of the PTC, this
may take about 5 minutes. A restart before the
PTC is back to low resistance may be successful
or the motor may stall in a locked-rotor state de-
pending on the ambient and system's conditions.
A locked-rotor state causes the internal protector
Model
MLZ/MLM015
MLZ/MLM019
MLZ/MLM021
MLZ/MLM026
MLZ/MLM030
MLZ/MLM038
MLZ/MLM042
Note: MLZ compressors with PTCSCR are not approved by UL. It is the customers' responsibility to get fi nal approval for the system
when required.
CSR wiring provides additional motor torque at
start-up, by the use of a start capacitor in combi-
nation with the run capacitor. The start capacitor
is only connected during the starting operation,
a potential relay is used to disconnect it after the
start sequence.
Some applications with high diff erential pressure
and start duty as "soft serve ice cream machine"
can require CSR wiring. This confi guration can
also be used to reduce erratic starting at unfa-
vourable conditions such as very low ambient
temperature or weak voltage.
Default solution: PSC wiring
with run capacitor only
PSC wiring
Run capacitor
μF
40
70
50
55
45
45
60
60
55
FRCC.PC.015.A4.02
to open and would cause even further delay until
the overload is reset.
The following PTC types are recommended for
the MLZ/MLM single phase compressors:
N L₁
Thermostat
Run capacitor
PTC
Voltage code 1
208-230 V/1~/60 Hz
305C12*
305C9* / 305C11*
305C9* / 305C11*
305C12*
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
N L₁
Thermostat
Run capacitor
Additionnal components for CSR wiring
Start capacitor
Volt μF Volt
370 145-175 330
370 145-175 330
370 161-193 250
440 88-108 330
370 145-175 330
370 145-175 250
370 88-108 330
370 161-193 250
440 88-108 250
C
IOL
S R
Voltage code 5
220-240 V/1~/50 Hz
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
305C9* / 305C11*
Start Relay
C
5
2
S R
1
Start capacitor 15 kΩ -1 w
CSR wiring
Relay
Reference
3ARR3J3AL4 RVA9CKL
3ARR3J3AL4 RVA9CKL
3ARR3J24AP4 RVA3EKL
3ARR3J25AS4 RVA4GKL
3AAR3*3M* -
3AAR3*3M* -
3ARR3*3L* -
3ARR3*3L* -
3ARR3*25S* -
19