Famco Danfoss Maneurop MT, Руководство пользователя

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FRCC.PC.015.A5.02
19
Application Guidelines
CSR wiring provides additional motor torque
at start-up, by the use of a start capacitor in
combination 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.
remains at high temperature and thus at high
resistance as long as power is connected to the
compressor. When the compressor is switched
off, the PTC cools down to its initial low resistance
and becomes available to support the next
compressor start.
It is important to provide sufficient time between
motor starts to allow the PTC to cool down
close to ambient temperature. Depending on
the ambient 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 depending on the ambient and system’s
conditions. A locked-rotor state causes the internal protector 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:
CSR wiring
Nominal capacitor value
and relays
Electrical data, connections and wiring
Model
Voltage code 1
208-230 V/1~/60 Hz
Voltage code 5
220-240 V/1~/50 Hz
MLZ/MLM015 305C12* 305C9* / 305C11*
MLZ/MLM019 305C9* / 305C11* 305C9* / 305C11*
MLZ/MLM021 305C9* / 305C11* 305C9* / 305C11*
MLZ/MLM026 305C12* 305C9* / 305C11*
MLZ/MLM030 305C9* / 305C11* 305C9* / 305C11*
MLZ/MLM038 305C9* / 305C11* 305C9* / 305C11*
MLZ/MLM042 305C9* / 305C11* 305C9* / 305C11*
Note: MLZ compressors with PTCSCR are not approved by UL. It is the customers’ responsibility to get final approval for the
system when required.
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 40 370 145-175 330 3ARR3J3AL4 RVA9CKL
MLZ/MLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA9CKL
MLZ/MLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZ/MLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V / 1 / 60 Hz
Motor voltage code 1
not provided with the
compressor
MLZ/MLM015 45 370 145-175 330 3AAR3*3M* -
MLZ/MLM019-021 45 370 145-175 250 3AAR3*3M* -
MLZ/MLM026 60 370 88-108 330 3ARR3*3L* -
MLZ/MLM030 70 370 161-193 250 3ARR3*3L* -
MLZ/MLM038 55 440 88-108 250 3ARR3*25S* -
MLZ/MLM042 80 370 189-227 330 3ARR3*3L -
N L₁
Run capacitor
PTC
Thermostat
C
S R
IOL
N L₁
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S
R
Run capacitor