Daikin VRV IV+ Service Manual page 83

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DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
4 Remove the cover of the compressor wire terminals.
a
a Compressor wire terminals cover
5 Disconnect the Faston connectors from the compressor wire
terminals U, V and W.
INFORMATION
Note the position of the Faston connectors on the
compressor wire terminals to allow correct connection
during installation.
a a
a
a Faston connectors
6 Measure the resistance between the compressor motor
windings U-V, V-W and U-W. All measurements MUST be the
same.
CAUTION
Before measuring the
resistance, measure the resistance of the multimeter
probes by holding the probes against each other. If the
measured resistance is NOT 0 Ώ, this value MUST be
substracted from the measured winding resistance.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
compressor motor windings
Unit Compressor
RYYQ8~12, M1C
RXYQ8~12,
RYMQ8~12
RYYQ14~16, M1C + M2C
RXYQ14~16,
RYMQ14~16
RYYQ18~20, M1C
RXYQ18~20,
M2C
RYMQ18~20
Compressor motor winding
measurements are correct?
Yes
No
7 Re-connect the Faston connectors and install the cover of the
compressor wire terminals.
8 Install the compressor insulation.
9 Turn ON the unit using the respective circuit breaker.
10 Start the unit operation (via the user interface, operation switch,
central controller, ...).
11 Once the compressor operates, measure the U-V-W inverter
voltages. All measurements MUST be the same.
Inverter voltage measurements
are correct?
Yes
No
12 Measure the current in each phase U-V, V-W and U-W. All
measurements MUST be the same.
Compressor motor winding
current measurements are
correct?
Yes
No
To perform an insulation check of the compressor
Prerequisite: First perform an electrical check of the compressor,
see "3.2.1 Checking procedures" on
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Open the compressor insulation.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
2 Remove the cover of the compressor wire terminals.
3 Components
Winding resistance
value (at
temperature of
20°C)
0.26 Ω±5%
0.77 Ω±5%
0.77 Ω±5%
0.26 Ω±5%
Action
Continue with the next step.
Replace the compressor, see
"3.2.2 Repair procedures" on
page 84.
Action
Continue with the next step.
Replace the inverter PCB, see
"3.8 Inverter PCB" on page 99.
Action
Perform an insulation check of
the compressor, see
"3.2.1 Checking procedures" on
page 82.
Preventively replace the
compressor, see "3.2.2 Repair
procedures" on page 84.
page 82.
"3.13 Plate
Service manual
83