tors are not recommended. Terminals can accept
aluminium conductors but the conductor sur-
face has to be clean and the oxidation must be
removed and sealed by neutral acid free Vase-
line grease before the conductor is connected.
Furthermore, the terminal screw must be retigh-
tened after two days due to the softness of the
aluminium. It is crucial to keep the connection a
gas tight joint, otherwise the aluminium surface
will oxidize again.
• Fuses
- Branch circuit protection:
In order to protect the installation against elec-
trical and fire hazard, all branch circuits in an
installation, switch gear, machines etc., must be
shortcircuit and overcurrent protected according
to the national/international regulations.
- Short circuit protection:
The frequency converter must be protected
against short-circuit to avoid electrical or fire
hazard. Danfoss recommends using the fuses
mentioned below to protect service personnel or
other equipment in case of an internal failure in
the drive. The frequency converter provides full
short circuit protection in case of a short-circuit
on the motor compressor output.
- Over current protection:
Provide overload protection to avoid fire hazard
due to overheating of the cables in the installa-
tion. The frequency converter is equipped with
an internal over current protection that can be
used for upstream overload protection (UL-appli-
cations excluded). See par. 4-18. Moreover, fuses
or circuit breakers can be used to provide the
over current protection in the installation. Over
current protection must always be carried out
according to national regulations.
• Electrical motor compressor protection
The electrical motor compressor protection is
fully provided by the CD302 frequency converter.
- CD302 makes through an Electronic current
measurement anti-overload and lock-rotor motor
compressor protection (see description in the
application manual).
- The frequency converter is protected against
short-circuits on compressor terminals U, V, W.
- If a mains phase is missing, the frequency
converter trips or issues a warning (depending on
the load).
- If a motor compressor phase is missing, the
frequency converter trips.
- The frequency converter is protected against
earth faults on compressor terminals U, V, W.
- The frequency converter is protected against
short circuits on compressor terminals U, V, W.
- Monitoring of the intermediate circuit voltage
ensures that the frequency converter trips if the
intermediate circuit voltage is too low or too high.
- UL compliance (380-480 V, 525-600 V)
CD 302
Bussmann
SIBA
Littel fuse
Ferraz- Shawmut
kW
Type RK1
Type J
Type T
Type RK1
Type K1
Type CC
Type RK1
4.0
KTS-R20
JKS-20
JJS-20
5017906-020
KLS-R20
ATM-R20
A6K-20R
5.5-7.5
KTS-R30
JKS-30
JJS-30
5012406-32
KLS-R30
ATM-R30
A6K-30R
11.0
KTS-R40
JKS-40
JJS-40
5014006-040
KLS-R40
A6K-40R
15.0
KTS-R50
JKS-50
JJS-50
5014006-50
KLS-R50
A6K-50R
18.0
KTS-R60
JKS-60
JJS-60
5014006-63
KLS-R60
A6K-60R
22.0
KTS-R80
JKS-80
JJS-80
100 KLS-R80
KLS-R80
A6K-80R
- Non UL compliance :
If UL/cUL is not to be complied with, we recommend using the following fuses, which will ensure compliance with EN50178.In case of malfunction, not following the
recommendation may result in unnecessary damage of the frequency converter.
CD 302
Max. fuse size
Voltage
Type
3K0-3K7
32A*
200-240 V
type gG
3K0-4K0
20A*
380-480 V
type gG
5K5-7K5
32A*
380-480 V
type gG
11K
63A*
380-480 V
type gG
15K
63A*
380-480 V
type gG
18K
63A*
380-480 V
type gG
22K
80A*
380-480 V
type gG
* : Max. fuses - see national/ international regulations for selecting an applicable fuse size.
130BA012.11
1
4
2
3
A1, A2 and A3 enclosures
A5, B1 and B2 enclosures
1. 10 pole plug digital I/O
2. 3 pole plug RS485 Bus
3. 6 pole analog I/O
4. USB Connection
• Access to Control Terminals
Instructions
AN000086420674en-000201 | 5
© Danfoss | DCS (CC) | 2019.04
