Flowserve KW941 - Manual (Page 7)

KW941 Pump Power Monitor USER INSTRUCTIONS ENGLISH 71569285 02-12
Page 7 of 24 flowserve.com
Fusing of the control voltage transformer primary
and/or secondary circuit supplying power to the
KW941 may be required. Please consult local area
electrical codes/regulations.
•
Control Voltage Transformer: (Not Supplied)
Rating: 15 VA (Volt Amps) or greater.
•
Power On/Off Switch: (Not Supplied)
No On/Off switch is provided with the
KW941. It is intended to be On (operational)
whenever power is supplied to the motor starter
control circuits, whether or not the motor is running,
so that it can be set up prior to starting the equipment
and provide protection on startup. The transformer
supplying power to the KW941 is normally installed
ahead of the motor starter contactor but after the
starter power disconnect switch, so that power can be
turned off with the disconnect switch. If required, the
control transformer circuit supplying power to the
KW941 can be switched.
3.3.3 Wiring and Grounding
•
Maximum TS1 connection wire size: #14 AWG.
•
Use wire with adequate insulation and current
carrying capability for the application.
•
Terminal TS1 #1 is internally connected to the
KW941's metal chassis. Connect this point to
earth ground.
•
Use of metallic conduits will require bonding
between the conduits.
PLEASE FOLLOW ALL AREA
ELECTRICAL CODES/REGULATIONS!
3.3.4 Full Scale Range
•
0.7 to 112 KW (1 to 150 HP) @ 460 Vac, 50/60
Hz three phase power with the supplied current
sensor (toroid).
•
Contact Flowserve Engineering for higher power
capabilities (to 999 hp with auxiliary current
sensor) and for special applications.
3.3.5 Current Sensor (also known as a toroid or
current transformer)
•
200 amp (primary), current sensing toroid
•
12" #24 AWG leads
•
Max lead extension length = 30.5 m (100 feet).
•
O.D: 51 mm (2.0 in.)
•
I.D.: 18 mm (0.7in.) – this limits the maximum
wire size that can go through current sensor.
•
Ht.: 20 mm (0.8 in.)
3.3.6 Alarm Output Relay Contacts
5 amps @ 125 VAC
3 amps @ 277 VAC
5 amps @ 30 VDC
3.3.7 Analog Output
•
4 to 20 milliamp source, proportional to full
scale.
•
Maximum loop load resistance = 600 Ohms.
3.3.8 Digital Display
•
3 digit, 0.6" high, seven segment, red LED.
•
Displays 0.0 to 999
3.3.9 Timers
•
Start-Up Delay Timer: Adjustable 0 to 999
seconds.
•
Trip Delay Timers: Adjustable 0 to 999 seconds.
3.3.10 Remote Reset
•
Momentary external mechanical or solid state
switch to conduct < 200 microamps DC between
"RESET +" and "RESET -" terminals.
•
Reset input specifications (for use with solid
state logic switch resets)
•
For NORMAL operation: +2 to +5 VDC
between reset terminals
•
For RESET: -0.3 to +0.8 VDC between reset
terminals (minimum pulse width 20
milliseconds).
3.4 Performance and operation limits
Operating Temperature: -40 to 70 °C (-40 to 158 °F) .
Effective toroid power limit = 112 KW (150 HP)
Power monitoring using only the supplied
current sensor is limited by its 200 amp current limit
and the size of the motor lead that can fit through the
toroid’s internal diameter (18 mm (0.7 in.)).
Use of a second current transformer in series with the
supplied toroid can allow the KW941 to monitor
power levels up to 745 KW (999 HP).
Supply voltage should not exceed 230 Vac at 50 Hz
or the internal fuse may blow.
Unbalanced power line/load conditions will affect
power readings.
The motor efficiency value used during initial setup
(Section 4 Installation) affects the KW941 power
reading displayed.