5-108
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
H44, H78
H79, H94
Startup Counter for Motor 1, Maintenance Interval (M1)
Preset Startup Count for Maintenance (M1), Cumulative Motor Run Time 1
Cumulative motor run time 1 (H94)
Operating the keypad can display the cumulative run time of motor 1. This feature is useful for management and
maintenance of the mechanical system. H94 allows you to set the cumulative run time of the motor to the desired value,
which enables setting an arbitrary initial data to determine a parts or inverter replacement timing. Specifying "0" clears
the cumulative run time of the motor.
Even when a motor is driven by commercial power, not by the inverter, it is possible to count the cumulative run time
of the motor by detecting the ON/OFF state of the auxiliary contact of the magnetic contactor for switching to the
commercial power line. To enable this function, assign
CRUN-M1 (Commercial power driving status of motor 1,
function code data = 72) to one of the digital input terminals.
• H94 data is in hexadecimal notation. It appears, however, in decimal notation on the keypad.
• Cumulative motor run time 2 through 4 can also be counted by assigning
CRUN-M2 through CRUN-M4
(Commercial power driving status of motor 2 through 4, function code data = 73 through 75).
Startup counter for motor 1 (H44)
H44 counts the number of inverter startups and displays it in hexadecimal format. Check the displayed number on the
maintenance screen of the keypad, and use it as a guide for maintenance timing for parts such as belts. To start the
counting over again, e.g. after a belt replacement, set the H44 data to "0000."
■ Maintenance timer MNT
1) H78 (Maintenance interval (M1)) specifies the maintenance interval in units of ten hours. When the cumulative
motor run time 1 (H94) reaches the time specified by H78 (Maintenance interval (M1)), the inverter outputs the
maintenance timer signal
MNT to remind the user of the need of system maintenance.
The setting is in units of 10 hours. The maximum setting is 9999 × 10 hours.
- Data setting range: 0 (Disable); 1 to 9999 (in units of ten hours)
< Biannual maintenance >
2) H79 (Preset startup count for maintenance (M1)) specifies the number of inverter startup times to determine the next
maintenance timing. When the count of the startup counter for motor 1 (H44) reaches the number specified by H79
(Preset startup count for maintenance (M1)), the inverter outputs the maintenance timer signal
MNT to remind the
user of the need of system maintenance.
Set the H79 data in hexadecimal. The maximum setting count is 65,535 (FFFF in hexadecimal.)
- Data setting range: 0000 (Disable); 0001 to FFFF (Hexadecimal)
< Maintenance every 1,000 times of startups >
To enable this function, assign the maintenance timer signal MNT to one of the digital output terminals (function
code data = 84).
• After the current setting has expired, set a value for the next maintenance in H78 and press the key so
that the output signal is reset and counting restarts.
• After the current setting has expired, set a value for the next maintenance in H79 and press the
key so
that the output signal is reset and counting restarts.
This function is exclusively applies to the 1st motor.
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