LG C Series - Manual (Page 100)

Chapter 11. Monitoring
11. Monitoring
11.1 Operating status monitoring
z Output current
Group
LED
Display
Description
Set
value
Min/Max
range
Factory
default
Unit
Drive
group
CUr Output current -
ƒ Inverter output current can be monitored in Cur.
z Motor RPM
Group
LED
Display
Description
Set
value
Min/Max
range
Factory
default
Unit
Drive
group
rPM [Motor RPM] -
H31
[Number of motor poles]
- 2/12 4
H40 [Control mode select] - 0/2 0
Function
group 2
H74
[Gain for Motor rpm
display]
- 1/1000 100 %
ƒ Motor rpm can be monitored in rPM.

When H40 is set to 0 {V/F control} or 1 {PID control}, the Inverter output frequency (f) is
displayed in RPM using the formula below. Motor slip is not considered.
100
74
31
120 H
H
f
RPM
Ч ⎟
⎠
⎞
⎜
⎝
⎛ Ч
=

H31: Enter the number of rated motor poles on the nameplate.

H74: This parameter is used to change the motor speed display to rotating speed
(r/min) or mechanical speed (m/mi).
z Inverter DC Link Voltage
Group
LED
Display
Parameter Name
Set
value
Min/Max
range
Factory
default
Unit
Drive
group
dCL
[Inverter DC Link
Voltage]
-
ƒ Inverter DC link voltage can be monitored in dCL.

2 times the value of input voltage is displayed while motor is at a stop.

It is the voltage detected between P1 and N terminal of power terminal.
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