3.3.15 High-voltage Test
Carry out a high-voltage test by short-circuiting terminals
U, V, W, L1, L2 and L3. Energize by max. 2.15 kV DC for 1 s
between this short circuit and the chassis.
NOTICE!
When running high-voltage tests of the entire instal-
lation, frequency converter and compressor electrical
motor compressor test can be conducted together.
WARNING
When conducting a high-voltage test, make sure that the
system is not under vacuum: a vacuum may cause
electrical motor compressor failure.
WARNING
Never apply the high-voltage test to the control circuit.
3.4 Fuses and Circuit Breakers
3.4.1 Fuses
NOTICE!
To ensure compliance with IEC 60364 for CE or NEC 2009
for UL, use fuses and/or circuit breakers on the supply
side of the unit for protection of electrical components
within the frequency converter.
WARNING
Personnel and property must be protected against the
consequence of component break-down internally in the
frequency converter.
Branch Circuit Protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines
etc., must be protected against short circuit and over-
current according to national/international regulations.
NOTICE!
The recommendations given do not provide UL branch
circuit protection.
Danfoss recommends using the fuses/circuit breakers listed
in the following tables to protect service personnel and
property in case of component break-down in the
frequency converter.
3.4.2 Recommendations
WARNING
In case of malfunction, ignoring recommended fuse
types may result in personnel risk and damage to the
frequency converter and other equipment.
The following tables list the recommended rated current.
Recommended fuses are of the type gG for small to
medium power sizes. For larger powers, aR fuses are
recommended. For circuit breakers, Moeller types have
been tested to have a recommendation. Other circuit
breakers may be used if they limit the energy into the
frequency converter to a level equal to or lower than the
Moeller types.
For further information, see Application Note
Fuses and
Circuit Breakers, MN90T
How to Install
Operating Instructions
MG34M422
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
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