Application guidelines
61
FRCC.PC.023.A7.22
Single compressors
Installation
High voltage test
It is not necessary to perform a Hipot test
(dielectric withstand test) on frequency
converters. This has already been done during
factory final test.
If a Hipot test has to be done anyway, following
instructions must be followed in order to not
damage the frequency converter:
• Compressor not connected
• L1, L2, L3, U, V, W terminals must be shorten
and connected to high voltage terminal of the
testing device.
• Ground terminal (chassis) must be connected to
low voltage terminal of the testing device.
• 2000VDC(for T2)/2150VDC( for T4)/2250VDC (for
T6) for 1 seconds must be applied
• Ramp up time 3 seconds
• Full DC voltage must be established during 2
seconds
• The current leakage during the test must be
below 1mA
• Ramp down time to 0V in 25 seconds.
When running high voltage tests of the
entire installation, frequency converter and
compressor electrical motor compressor test
can be conducted together. When conducting
a high voltage test make sure the system is not
under vacuum: this may cause electrical motor
compressor failure.
L1 L2 L3
91 92 93
U V W PE
96 97 98 99
NET
MOTOR
R- R+
81 82
01 02 03
- 24V + - DC +DC
35 36 88 89
MOTOR
NET
95
94
2 20 200 2000MOhm
+
-
20 ohm
M ohm
Gossen - ISOWID - 0413
M ohm
V
Ohm
On M Ohm 2000 M Ohm
System pressure test
Always use an inert gas such as nitrogen for
pressure testing. Never use other gasses such as
oxygen, dry air or acetylene as these may form
an inflammable mixture. Do not exceed the
following pressures:
Pressurize the system on HP side first then LP side
to prevent rotation of the scroll. Never let the
pressure on LP side exceed the pressure on HP
side with more than 73 psi.
Maximum compressor test pressure (low side)
483 psi(g) for VZH088 & 117
438 psi(g) for VZH170
Maximum compressor test pressure (high side)
653 psi(g)
Maximum pressure difference between high and low side
of the compressor
537 psi
