Chapter 4 – Control Operation
ACH 500 Programming Manual 4-9
Keypad Reference 1
and Keypad PI
Keypad Reference 1
Operating Data Parameter 10 (Keypad Ref 1) is a direct frequency reference.
To set the frequency reference, select Parameter 10 (Keypad Ref 1), press
[ * ], then press [Up Arrow] or [Down Arrow] keys to increase or decrease the
keypad reference.
When in Keypad control using Reference 1, you can change the Keypad
Reference value while monitoring any of the measured values 1 – 8. For
example, you can monitor Operating Data Parameter 7 (Output Voltage) while
changing the frequency. To do this, select the measured value you prefer,
press [ * ], then press [Up Arrow] or [Down Arrow] to increase or decrease
the reference frequency. If Operating Data Parameters 1 (Output Frequency)
or 2 (Speed) are selected, the display will switch to show Parameter 10
(Keypad Ref 1) while changing the reference and will automatically change
back when the arrow key is released.
If the ACH 500 is running with an External Reference and the control location
is changed to Keypad R1, it is possible to let the Keypad Ref 1 assume the
current value of the External Reference.
Example: The ACH 500 is receiving frequency reference from a transducer
via Terminal Block X50. You want to temporarily override the external
frequency reference.
1. Set Operating Data Parameter 9 (Control Location) to KEYPAD R1.
2. Press and hold down [Start/Stop] and press [ * ].
Note: If external Start/Stop function is set to Keypad, the ACH 500 will stop,
but will read the reference.
The ACH 500 puts the value of External Reference into Operating Data
Parameter 10 (Keypad Ref 1) which will make a smooth transition from
External to Keypad possible. You may now control the drive manually by
Keypad Ref 1.
If you enter Display mode by pressing [ * ] after setting Operating Data
Parameter 9 (Control Location) to KEYPAD R1, the value of Operating Data
Parameter 10 (Keypad Ref 1) will be the set minimum frequency.
Keypad PI (Ref 2)
Keypad PI goes through an application block, where it can be manipulated
when the PI-Controller is selected. Keypad PI can be used as controller
reference or it can be given its own acceleration/deceleration ramps. Refer to
Parameters 20.3.7 (Accel Ref 2 Time) and 20.3.8 (Decel Ref 2 Time).
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