Chromalox 1604 User Manual download pdf (Page 23)

ENABLE/DISABLE THE CONTROL OUTPUT

When the instrument is in "normal display mode",

by keeping depressed for more than 5s s and

FUNC pushbuttons, it is possible to disable the

control outputs. In this open loop mode the device

will function as an indicator, the lower display will

show the word OFF and all control outputs will

also be in the OFF state.

When the control outputs are disabled the alarms

are also in non alarm condition.

The alarm outputs conditions depend on the

alarm action type (see P19-P21).

Depress for more than 5s s and FUNC

pushbuttons to restore the control status.

The alarm stand-by function, if configured, will be

activated as if it was at power up.

If a power down occurs when the control output is

disabled, at intrument power up the control output

will be automatically disabled.

SP - SP2 SELECTION

It is possible to select the operating set point (SP

or SP2) only by an external contact (terminals 14

and 15).

This function excludes the "OUT 1 failure

detection" function and the current transformer.

By setting P41, it is possible to display the final or

the operative set point during a ramp execution.

OUT 1 FAILURE DETECTION FUNCTION

The device is capable (for the load driven by the

OUT 1) to measure and display:

- the current running in the load when the load is

energized;

- the leakage current, flowing through the load,

when the load is de-energized.

If the P10 parameter has been correctly set, the

instrument generates an alarm when:

- the current running in the load is lower than the

"Hbd" parameter value (It shows a partial or

total break down of the load, the break down of

the actuator or a power down due to a

protection or a fuse intervention);

- the leakage current is higher than the "SCA"

parameter value (It shows a short circuit of the

actuator).

The "Display function" paragraph describes how

to show the two current values.

A fault condition is shown by OUT 3 LED flashing

and by OUT 3 relay status.

If the ON or OFF period is lower than 400 ms the

relative measurement couldn't be performed and

the instrument will show flashing the last

measured value.

DIRECT ACCESS TO THE SET POINT

When the device is in AUTO mode and in “Normal

Display Mode”, it is possible to access directly to

set point modification (SP or SP2).

Pushing s or t for more than 2 s, the set point

will begin changing.

The new set point value becomes operative since

no pushbutton has been depressed at the end of

2 s timeout.

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Chromalox 1604 User Manual Page 23

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