Danfoss MLZ, Selection & Application Manuallines

Page: 17 / 40

A
PPLICATION GUIDELINES
E
LECTRICAL DATA
,
CONNECTIONS AND WIRING
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 differential pressure
and start duty as "soft serve ice cream machine"
can require CSR wiring. This configuration can also
be used to reduce erratic starting at unfavourable
conditions such as very low ambient temperature
or weak voltage.
CSR wiring
Nominal capacitor value
and relays
Three phase
Suggested wiring diagram with
"one shot" pump down cycle
and safety lock-out relay
Control device .................................................. TH
Optional short cycle timer (3 min) .........180 s
Control relay .................................................... KA
Liquid Line Solenoid valve .........................LLSV
Compressor contactor .................................. KM
Phase monitor ................................................ PM
Safety lock out relay ........................................KS
Pump-down control low pressure switch .. LP
High pressure safety switch........................ HPs
Fused disconnect ............................................ Q1
Fuses ...................................................................F1
Compressor motor ...........................................M
Discharge gas thermostat ......................... DGT
Compressor models
Default solution: PSC wiring
with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiring
Run capacitor Start capacitor Relay
μF Volt μF Volt Reference
220-240 V /1/50 Hz
Motor voltage code 5
MLZ/MLM015-019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA9CKL
MLZ/MLM030 50 370 161-193 250 3ARR3J24AP4 RVA3EKL
MLZ/MLM038-045-048 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
208-230 V / 1 / 60 Hz
Motor voltage code 1
MLZ/MLM019-021 45 370 145-175 250 3AAR3*3M*
MLZ/MLM026 60 370 88-108 330 3ARR3*3L*
MLZ/MLM030-033 60 370 161-193 250 3ARR3*3L*
MLZ/MLM038 55 440 88-108 250 3ARR3*25S*
17 FRCC.PC.016.A1.22
M
DGT
HPs
180 s
TH
LP
CONTROL CIRCUIT
F1 F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
N L₁
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S R
Run capacitor