The signal that enables the system can be supplied to any input (for the electrical connections refer to the control unit manual). The system disabling

function is obtained by setting the parameter Ix, relating to the input to which the signal to be used to disable the system is connected, on one of the

values shown in Table 18.

When the function is active, the system shuts down completely and the F3 symbol appears on the main page.

When several system disabling functions are configured at the same time on different inputs, the system will indicate F3 when at least one function is

activated and will remove the alarm when none is activated.

For the system to work with the disable function, the input must be active for at least 1 sec.

When the system is disabled, for the function to be deactivated (re-enabling the system), the input must not be active for at least 1 sec. The behaviour

of the function is summed up in Table 17.

When several disable functions are configured at the same time on different inputs, the system will show F3 when at least one function is activated.

The alarm is removed when no input is activated.

This function also allows the resetting of any faults present, see table 18.

Behaviour of the system disabling and fault reset function depending on Ix and on the input

Value of

Parameter

Active with high signal on input (NO)

Active with low signal on input (NC)

Active with high signal on input (NO)

Active with low signal on input (NC)

Active with high signal on input (NO)

Setting low pressure detection (KIWA)

The minimum pressure switch that detects low pressure can be connected to any input (for the electrical connections refer to the control unit manual).

The system disabling function is obtained by setting the parameter Ix relating to the input to which the signal to be used to disable the system is

connected on one of the values shown in Table 18. The activation of the low pressure detecting function generates the blocking of the system after the

time T1 (see par. 7.6.2 - T1: Low pressure delay). The function has been conceived to connect the input to the signal arriving from a pressure switch

which indicates too low a pressure on the pump intake. When this function is active the symbol F4 is shown on the main page. Tripping of this function

causes the pump to cut out; it may be reset automatically or manually. For automatic reset of the F4 error condition, the input must be deactivated for

at least 2 sec. before the system resets. To reset the cut-out in manual mode, press and then release the "+" and "-" keys simultaneously.

The behaviour of the function is summed up in Table 19. When low pressure detection functions are configured at the same time on different inputs,

the system will indicate F4 when at least one function is activated and will remove the alarm when none is activated.

Response of low pressure detection function (KIWA) according to Ix and input

Value of

Input

Parameter

configuration

Active with high

signal on input

(NO)

Active with low