YASKAWA CIMR-JC4A0002BAA Quick Start Manual page 145

5.5 Alarm Detection
Cause
A digital input programmed to
67H (MEMOBUS/Modbus
test) was closed while the drive
was running.
LED Operator Display
Uv
Cause
Phase loss in the drive input
power.
Loose wiring in the drive input
power terminals.
There is a problem with the
drive input power voltage.
Drive internal circuitry is
worn.
The drive input power
transformer is not large enough
and voltage drops when the
power is switched on.
Air inside the drive is too hot. • Check the temperature inside the drive.
The CHARGE indicator light
is broken or disconnected.
144
Possible Solutions
Stop the drive and run the test again.
Undervoltage
One of the following conditions occurred while the drive was in operation:
• DC bus voltage dropped below the under voltage detection level.
• Contactor to suppress inrush current in the drive was open.
• Low voltage in the control drive input power. This alarm outputs only if L2-01 is
not 0 and DC bus voltage is below the detection level.
Possible Solutions
Check for wiring errors in the main circuit drive input power.
Correct the wiring.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque specified in this manual to fasten
the terminals. Refer to Wire Gauges and Tightening
Torque on page 46
• Check the voltage.
• Lower the voltage of the drive input power so that it is within
the limits listed in the specifications.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
• Check for a tripped alarm when the magnetic contactor, line
breaker and leakage breaker are turned on.
• Check the capacity of the drive input power transformer.
• Replace the drive.
YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
http://nicontrols.com
Minor Fault Name
Minor Fault
Output
(H2-01 = 10)
No output
Minor Fault
Output
(H2-01 = 10)
YES
YES
YES
YES
YES
YES
YES