17
IOM 1372
WWW.DAIKINAPPLIED.COM
ELECTRICAL DATA
Electrical Data
Field Power Wiring
The standard power wiring connection to Magnitude chillers is
multi-point for dual compressor WME models. Power conduit
entry will be at the top of the unit power panel; see
for
general reference as power entry cover plate location will vary by
unit configuration. Copper wiring must be used for power wiring.
Refer to the unit nameplate and the Daikin Tools selection report
for the correct electrical ratings.
DANGER
Qualified and licensed electricians must perform wiring. An
electrical shock hazard exists that can cause severe injury or
death.
Figure 18: Unit Power Connection Point
Factory-mounted and wired line reactors are standard. The field
control wiring required varies depending on unit model. See the
WME-D Field Wiring Schematic for wiring information. These
wiring diagrams are also provided with the chiller.
NOTICE
Wiring, fuse, and wire size must be in accordance with the
National Electrical Code
®
(NEC). The voltage to these units must
be within ±10% of nameplate voltage (415V units must have
voltage within -13% and +6% of nameplate voltage) and the
voltage unbalance between phases must not exceed 2%. Since
a 2% voltage unbalance will cause a current unbalance of 6 to 10
times the voltage unbalance per the current version of the NEMA
MG-1 Standard, it is most important that the unbalance between
phases be kept at a minimum.
CAUTION
Do not use power factor correction capacitors with WME
chillers. Doing so can cause harmful electrical resonance in the
system. Correction capacitors are not necessary since VFDs
inherently maintain high power factors.
Chiller Control Power
In all cases of power operation except when with RapidRestore,
the chiller control power must remain as factory-wired from a unit-
mounted power supply.
RapidRestore
®
and RideThrough
®
WME chillers have the capability for chillers to restart and reach
full load operation quickly in the event of a power loss.
RapidRestore –
Quickly restores cooling capacity when power is
restored after a power failure.
•
Compressor Re-Start –
Amount of time required for the
chiller to re-start.
•
Fast Loading –
Amount of time required for the chiller to
reach a certain load condition.
RideThrough –
The ability to maintain operation during a
momentary power loss event. When RideThrough is enabled and
a power loss occurs, the compressor motor maintains rotation
and the VFD catches and re-synchronizes with the spinning rotor.
This permits the chiller to return to its pre-power loss capacity
within seconds of power being restored.
Table 6: RapidRestore and RideThrough Times
Standard
Compressor
Re-Start
RapidRestore
Compressor
Re-Start
Fast Loading
to 80% Load
RideThrough
60 sec
20 sec
after power
failure*
75 sec**
17 sec***
*
Requires customer supplied Uninterruptible Power Supply
(UPS) to the WME control panel.
**
After compressor re-start time
***
Time is based on unit operating at AHRI conditions.
Power Panel Short Circuit Current Ratings
Available short circuit current ratings (SCCR) are shown in
7 .
Table 7: Short Circuit Current Ratings
Motor
Code
Voltage
Standard
Panel
SCCR
Optional
High
SCCR
Optional
Ultra
High
SCCR
MK
460V - 480V
35-50 kA
65 kA
100 kA
575V
25 kA
35 kA
50 kA
NOTE:
Standard panel SCCR is dependent on electrical configuration, please refer
to data plate or tech data for unit SCCR
Fuses
Manufacturer
Class
Amps
Bussmann
Class CC
2 Amp
Bussmann
Class CC
2.5 Amp
Bussmann
Class CC
15 Amp
Bussmann
Class CC
10 Amp
Содержание MAGNITUDE WME-D
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