Single Phase Motor Energy Control - Page 14 of 20
Table 2
Automatic Saving Level Selection
SWITCH 2
SWITCH 3
SWITCH 4
ENERGY SAVING
OFF
OFF
OFF
Max. Saving. Level 1
OFF
ON
OFF
Level 2 (Default)
OFF OFF ON
Level
3
OFF
ON
ON
Min. Saving. Level 4
4.3.3.2 FIXED BACKSTOP SAVING MODE
In the event that the automatic mode of energy savings is not satisfactory then you can
place the unit into a “fixed backstop voltage” condition however this should be done in very
controlled environments as the system will not then operate dynamically and should full
power be required on the motor it will not be available. See Table 3 below.
Table 3
Pedestal Voltage Saving Level Selection
SWITCH 2
SWITCH 3
SWITCH 4
PEDESTAL VOLTAGE
ON OFF OFF
≅
70% Supply Voltage
(
≅
30% Savings)
ON ON OFF
≅
80% Supply Voltage (
≅
20% Savings)
ON OFF ON
≅
85% Supply Voltage
(
≅
15% Savings)
ON ON ON
≅
90% Supply Voltage (
≅
10% Savings)
The voltages shown in Table 3 are not absolute but indications only. Input voltage and load conditions
will cause the output voltage to change from that shown based on a supply voltage of 220V.
4.3.4 SOFT START
In the event that you want a soft start function, for example, with a water pumping
application, then this can be enabled by putting DIP Switch 5 into the ON position. This
switch will enable a 3s ramp start prior to a 2.5s DOL period after which time the system will
go into energy save mode.
4.3.5 REFRIGERATION APPLICATION SETTING
In all cases where EnviroStart is fitted to refrigeration compressors, a minimum period of
two minutes should elapse between stopping and starting the compressor motor. This is to
allow the system to shed its backpressure. In many systems such as those manufactured by
Cornelius, you will find that the thermostat has a built in timer, in applications where such a
timer does not exist, it is imperative that you observe the two minute rule especially during
set up and commissioning when frequent stop-start cycles are undertaken.
