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6.15.6 Protective operations
6.15.6.1 Light alarms and heavy alarms in E-SX bus communication (
er4
)
(1) Causes of light alarms and heavy alarms (
er4
)
Light alarms and heavy alarms are generated on the E-SX bus interface card depending on the alarm level.
When an alarm occurs, the inverter outputs an
er4
"network error" and the motor coasts to stop.*1
*1 Inverter function code H107 can be set to display
l-al
and continue operation when an alarm occurs. Refer to
the explanation of H107 in Chapter 4, Section 4.3 "Details of Function Codes."
Table 6.15.5 Causes of Light Alarms and Heavy Alarms (
er4
)
Item Light alarm Heavy alarm 1 Heavy alarm 2
Card LED state
ERR (lit)
RUN (lit)
ERR (lit)
RUN (lit)
Undefined
Cause *2
Normal reception failed 3
times in succession due to
noise on communication
line or other cause.
All masters down
(Cable break, PLC
power interrupted)
Card hardware failure
Improper card installation
Reset method
Clear alarm cause (auto clear by communication reset) or
set H30 = 0, 1 or [LE] = OFF and issue reset command.
*3
After clearing the alarm
cause, cycle the inverter
power off/on (clearing is not
possible until the power is
turned off).
Control of alarm state
Alarms can be controlled by
function codes o30, o31.
When a heavy alarm occurs, an
er4
alarm is generated
immediately.
Communication error
code displayed on
keypad
*4
1 2 3
Alarm sub-code
*5
01(hex) 02(hex) 04(hex)
*2 When a light alarm cause occurs and command via E-SX is enabled (H30 = 2, 3 and LE = ON; for details, refer
to the explanation of H30 in Chapter 4, Section 4.3 "Details of Function Codes"),
er4
is generated. With heavy
alarm 1, when run command via E-SX is ON,
er4
is generated. With heavy alarm 2,
er4
is generated
regardless of the settings when the cause occurs.
*3 "Issue a reset command" at light alarm and heavy alarm 1 refers to inverter reset input by any of the following
methods.
＊ Keypad
key input
* Assign error reset [RST] by X function selection and input digitally.
* RST bit = 1 in Q area from E-SX communication
Depending on the MICREX-SX CPU state, the CPU may need to be reset as well when heavy alarm 1 occurs.
*4 The communication error code for a light alarm or heavy alarm can be checked in the communication status screen
of the maintenance information on the keypad. Press the
key in the operation mode screen of the
communication status screen to change to the menu screen, move the arrow on the left side of the screen to "5.
Maintenance" with the
/ key, and press the key. Press the key 3 times to display the screen below.
This error code indicates the first factor that caused
er4
to occur. A light alarm always occurs before heavy alarm
1 occurs, and thus when o30 = 0, this code shows the light alarm code even when the state is heavy alarm 1.
Figure 6.15.5 Communication Error (
er4
) Code Screen
ＮＲＫ = ×××××
ＮＲＲ = ××××× ××
ＮＲＯ = ××××× ××
ＮＲＬ = ××××× ××
∧∨ÆＰＡＧＥ ＳＨＩＦＴ ４
-: No communication error
1: Light alarm
2: Heavy alarm1
3: Heavy alarm2
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