6 MM Features
Mk8 MM Manual Page | 133
6.6 External Modulation
When using External Modulation, the internal PID control is disabled and the firing rate is set by an input
control signal on terminals 7, 8 and 9 as appropriate for 0 – 10V or 0/4 – 20mA. Set parameters 68 for the
external modulation control range, and parameter 69 for the input range.
There are two options to enable the use of External Modulation:
• Option 45: Setting this option to either 1 or 2 enables the constant use of the external input signal for
the modulation control.
• Option 55: Setting this option to 1 enables the possibility for the user to choose between internal PID
control and External Modulation according to the signal provided on terminal 88. Providing a line
voltage input on terminal 88 selects External Modulation and 0V selects Internal PID.
Note: External Modulation cannot be used if External Setpoint is enabled as the Auxiliary Analogue Input
can only be used for a single functionality.
6.7 External Setpoint
The Auxiliary Analogue Input channel can be used to receive an external setpoint input. This feature can be
enabled in Parameter 72 and an input control signal needs to be provided on terminals 7, 8 and 9 as
appropriate for 0-10V or 0/4-20mA. The input signal range and filtering time are set in parameter 69 and 70
respectively. The minimum and maximum external setpoint input values are set in options 30 and 31
respectively.
When External Setpoint is enabled the MM uses the signal provided into the auxiliary analogue input to
determine the required setpoint value.
When External Setpoint is enabled, Second Setpoint input may be used to select the reduced setpoint.
Note: External Setpoint cannot be used if External Modulation is enabled as the Auxiliary Analogue Input
can only be used for a single functionality.
6.8 Second Setpoint Select
Terminal 87 allows selecting between the main setpoint and a secondary setpoint. When terminal 87 is at 0V
the MM uses the internal ‘Required’ setpoint value. When a line voltage input is provided on terminal 87, the
MM uses the internal ‘Reduced’ setpoint value. A second setpoint input (T87) may be used to select the
reduced setpoint.
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