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6.2 Vernier Ratio
The Vernier Ratio is the ratio of the Vernier heater to the heaters used on the
individual stages. The Vernier Ratio is adjustable from 100 - 200%.
•
If the Vernier heater is the same power as the individual stage heaters,
then the Vernier Ratio should be set to 100%.
•
If the Vernier heater is twice the power of the individual stage heaters,
then the Vernier Ratio should be set to 200%.
7. Test Button
When the test button is held down, the command input is forced to 100% and
all of the stages will turn on at one stage per second. When the button is
released, the stages will turn off at the set stage delay rate.
8. Indicator LEDs
Power LED
– On when power is applied.
Individual Stage LEDs
– On as each stage is turned on.
Vernier Output
LED
– Increases in intensity when power is increasing
and Analog is selected. When Time Proportioning
is selected, turns on when the output is energized.
Slave Output
LED
– Increases in intensity when power is increasing to
the slave input.
9. Outputs
9.1 Relay Outputs
The NWVS uses mechanical relays to switch the coils of the load contactors.
The life span of the NWVS output relays are directly related to the user stage
delay setting as well as the load contactor specifications. Since the stage
delay and the choice of load contactor is determined by the end user, there
is no guarantee or warranty expressed or implied related to the life of the
output relays or load contactors.
9.2 Vernier Output
– Time Proportioned Drive Specifications
When Time Proportioning is selected, the Vernier output is a 24VDC current
limited 4 second cycle time PWM signal. The SSR used to control the
Vernier heater is driven from terminals TP+ and TP-. The drive
specifications are power supply related and are shown below.