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Motor Overheat Protection (pr. 9, Pr. 452, Pr. 876 ) - Mitsubishi Electric FR-V560 Instruction Manual

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4.3.6
Motor overheat protection (Pr. 9, Pr. 452, Pr. 876
When an external thermal relay is not used, protect the motor from overheat by integration processing of the
inverter output current. This feature provides the optimum protective characteristics, including reduced motor
cooling capability, at low speed.
Parameter
Name
9
Electronic thermal O/L relay
Second electronic thermal
452
O/L relay
876
Thermal relay protector input
<Setting>
• When not using an external thermal relay, set the rated current value [A] of the motor in Pr. 9 (Pr. 452) to make
the electronic thermal relay function valid.
• Setting "0" in Pr. 9 (Pr. 452) deactivates the electronic thermal relay function (motor protective function). (The
inverter's output transistor protective function is activated.)
• When using the Mitsubishi constant-torque motor
Set "10" in Pr. 71 "applied motor" to select the 100% continuous torque characteristic in the low speed range.
Set the rated current of the motor in Pr. 9 "electronic thermal O/L relay".
• The electronic thermal relay function of the second motor (Pr. 452 "second electronic thermal O/L relay" is made
valid by:
Turning on the RT signal; and
Setting other than 9999 in Pr. 450.
(The value set in Pr. 9 is valid when Pr. 452 = 9999.)
Selection for whether to use an external thermal relay or not (Pr. 876 "thermal relay
protector input")
Pr. 876 Setting
0
1
(factory setting)
Set value 0
U
V
W
OH
Not used
SD
CAUTION
• When two or more motors are connected to the inverter under V/F control, they cannot be protected by
the electronic thermal relay function. Install an external thermal relay to each motor.
• When a difference between the inverter and motor capacities is large and the setting is small, the
protective characteristics of the electronic thermal relay function will be deteriorated. In this case, use
an external thermal relay.
• A special motor cannot be protected by the electronic thermal relay function. Use an external thermal
relay.
Factory Setting
Rated inverter output current
9999
0
Motor with encoder (e.g. SF-JR)
When thermal relay etc. is not used (thermal relay protector input invalid)
When thermal relay etc. is used (thermal relay protector input valid)
Set value 1
IM
OH
SD
Basic functions (Pr. 0 to Pr. 9)
with
without
Encoder
Encoder
Speed
Setting Range
0 to 500A
0 to 500A, 9999
0, 1
IM
OHT error occurs when terminals OH-SD are open.
93
with
without
Condi-
tional PLC
SSC
Encoder
Encoder
)
Torque
Position
Remarks
Simple mode
Extended mode
9999: Without second
electronic thermal relay
function
Extended mode
4

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