Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Basic settings PU operation mode
FR-D700 SC EC 5 - 25
5.2.3 Use switches to give the frequency command (multi-speed setting)
In frequency inverters of the FR-D700 SC series up to 15 frequency setpoints (and thus rpms
and speeds) can be selected via the RH, RM, RL and REX terminals. Manually activated switch-
es or relay outputs of a programmble logic controller (PLC), for example, can be used to select
a frequency.
●
Pr. 79 "Operation mode selection" must be set to "4" (external/PU combined operation
mode 2).
●
Use the RUN key to give a start command.
●
The initial values of the terminals RH, RM, RL are 50Hz, 30Hz, and 10Hz. (Refer to
section 5.3.2 to change frequencies using Pr. 4, Pr. 5 and Pr. 6.)
●
Three setpoints can be selected by separately switching on the signals to the RH, RM and
RL terminals. The selection of the fourth to the seventh fixed frequency is possible through
the combination of signals of these inputs (see diagram below). The setpoints are determi-
ned by parameters 24 to 27. The REX terminal is used to select the 8th to the 15th rpm/
speed (section 6.5.1).
I002024E
Fig. 5-13: Use switches to give the frequency command
I000004aC
Fig. 5-14: Multi-speed selection by external terminals
Power supply
Motor
Inverter
High speed
Middle speed
Low speed
Operation
panel
t
RH
RM
RL
Output frequency [Hz]
Speed 1 (high speed)
Speed 2
(middle speed)
Speed 3
(low speed)
Speed 4
Speed 5
Speed 6
Speed 7
ON
ON
ON
ON
ON
ON ON ON
ON ON
ON