Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 76)

AQUAVAR Controller drive head Technical data and Terminals continued
Air Pollution: Minor amounts of dust and dirt are permitted. Excessive dust, acids,
corrosives and salts must be avoided.
Altitude: 3300’ above sea level, without derating. Derate 2% each 1000’ above 3300’.
Approvals: UL, CUL, CE
Enclosure: NEMA 4, IP 54
Control: Modified PID using two point control based on pressure, differential pressure or
flow input from electronic sensors.
Lead/Lag: Controlled by on-board microprocessor with alternation based on time, and
auto start/stop of each pump based on demand.
Inverter: The inverter is controlled by voltage (IGBT) and varies outgoing frequency with
a sinus valuated pulse width modulated output voltage. It works with
controlled sinusoidal current synthesis and a dynamic overcurrent limitation.
An adjustable high switching frequency of 8 khz prevents undesired noise
from driving motors. Reactions to the feeder are prevented by a filter, and
cooling is enhanced by the motor fan, or integral fan for wall mount versions.
Terminals: There is a terminal strip inside the AQUAVAR controller which will allow the
connection of a wide range of external devices for display or control. When
using these terminals, shielded wires need to be used. Unshielded wires may
produce signal interference which will affect the inverter. Always use shielded
wire.
X1 1 Ground connection
2 Actual value input 4- 20 mA, 50 ohm load resistance. Used to connect external
pressure transducer, flow meter, etc. Can also be used as input source from
another device signalling actual speed when “actuator” is selected in
controller mode.
3 Power source for external transducer 15 V DC, max. 100 mA current load
4 Ground connection for external on/off
5 External on/off connection, 10 kOhm resistance, 5 VDC gold plated contact.
Note that the external device must have a switch suitable for < 10 V. If no
outside panel or control is used, a jumper wire is installed on contacts 4 and
5 to prevent “INVERTER LOCKED”.
6 Ground connection for low water switch or float.
7 Low water switch connection, 10 kOhm resistance, 5 VDC. This contact is
where an external level switch, float switch or pressure switch from the suc-
tion line would be installed. If no suction pressure devices are used, a jumper
wire is installed on contacts 6 and 7.
8 5 V power source for the Klixon thermoswitch mounted in the motor conduit
box. 10 kOhm resistance.
75
Appendix B