Specifications

Cat 604-5 11
Electrical Data
Electrical Data
Electrical Notes
Units are available for:
• 3ph 380V 50/60Hz
• 3ph 400V 50/60Hz
• 3ph 415V 50/60Hz
• 3ph 460V 50/60Hz
• 3ph 480V 50/60Hz
• 3ph 575V 60Hz
Wiring, fuse and wire size must be in accordance with the
National Electric Code (NEC).
Important: Voltage unbalance not to exceed 2%.
Power Wiring
Use only copper supply wires with ampacity based on 75°C
conductor rating. Connections to terminals must be made with
copper lugs and copper wire.
Lug size range is: (3) 3/0 AWG - 500 kc mil.
Short Circuit Current Ratings
WME chillers are available with an optional High Short
Circuit Rating (HSCCR) or Ultra High Short Circuit
Current Rating (UHSCCR) in lieu of the standard rating
(SCCR) as shown in the above table
.
Motor Designation
WME 500 motors are designated as M2 or M3.
• "M2 motors utilize 3-phase power and the un
it VFDs
performs similar to a 6-pulse drive and are suitable for most
applications.
• "M3 motors utilize 3-phase power and the VFDs perform
similar to a 12-pulse drive. They provide higher power for
the higher tonnages and improved harmonics which will
satisfy the requirements of the IEEE 519 Standard in most
application.
WME 700 motors utilize 3-phase power and designated as M4.
The VFD performs similar to a 12-pulse drive.
Notes for field wiring diagram (page 12)
1 Optional Flow Switches; If field supplied pressure
differential flow switches are used, they must be
installed across the vessel and not the pump. They must
provide isolated dry contacts at J27. Removing the
factory jumpers willcorretly put the field switches in
series with the factory switches..
2 CW Reset & Demand Limit; External 4-20mA signals
can be wired to J23 for leaving (chilled) water reset and
to J26 for demand limit.
3 Tower Bypass Valve & Tower Fan VFD; 0-10VDC
analog output to these devices.
4 Remote On/Off Control of unit can be accomplished by
connecting a set of isolated dry contacts at J25.
5 Mode Switch; Switch used for ice mode currently not
available on WME chillers.
6 Condenser & Evaporator GPM; Connections for 4-20
ma flow signal from field-supplied devices.
7 Alarm Relay; A customer furnished 24 to 240 Vac
power for alarm relay coil may be connected at J18.
Maximum rating of the alarm relay coil is 25 VA.
8 Evap Water Pump #1 & #2; A digital output for an
optional customer supplied 25 VA maximum coil rated,
chilled water pump relay, One or two may be wired as
shown. This option will cycle the chilled water pump in
response to chiller demand.
9 Cond Water Pump #1 & #2; The condenser water
pump must cycle with the unit. A customer supplied 25
VA maximum coil rated, condenser water pump relay
(one or two) must be wired as shown. Units used in a
free-cooling application must have condenser water
above 50°F before starting.
10 Tower Fan Staging #1, #2 & #3; Digital outputs for
optional customer supplied 25 VA maximum coil rated
cooling tower fan relays may be wired as shown. This
option will cycle the cooling tower fans as prescribed by
the tower control set points.
11 Terminal Locations, The “J” terminals indicated on the
wiring diagram are located in the top rear of the control
panel under the control wiring knockouts.
Motor Voltage
Standard
Panel
Optional
High
SCCR
Optional
Ultra High
SCCR
3-Ph
380V-
480V
35 kA 65 kA 100 kA
575V 25 kA 50 kA N/A
6-Ph
380V-
480V
35 kA 65 kA 100 kA
575V N/A N/A N/A