Yaskawa Z1000U HVAC Matrix Bypass User Manual
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Alarm Outputs for Maintenance Monitors
An output can be set up to inform the user when a specific components has neared its expected performance life.
When one of multi-function digital output terminals has been assigned the maintenance monitor function (H2-oo = 2F), the
terminal will close when the cooling fan, DC bus capacitors, or DC bus pre-charge relay reach 90% of the expected performance
life, or when the IGBTs have reached 50% of their expected performance life. Additionally the HOA keypad will display an
to indicate the specific components that may need maintenance.
Table 7.5 Maintenance Alarms
HOA Keypad Alarm Display
Function
Corrective Action
LT-1
The cooling fans have reached 90% of their designated
life time.
Replace the cooling fan.
LT-2
The DC bus capacitors have reached 90% of their
designated life time.
Contact a Yaskawa representative or the
nearest Yaskawa sales office on
possible drive replacement.
LT-3
The DC bus charge circuit has reached 90% of its
designated life time.
Contact a Yaskawa representative or the
nearest Yaskawa sales office on
possible drive replacement.
7.3 Periodic Maintenance
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YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual