RTC Capability and Design Boundary
The Vacon 100HVAC includes a battery-backed real-time clock (RTC) that maintains date and time when the drive’s primary power is removed. RTC functions are selected through drive parameters; the evidence does not describe PLC-style logic programming or provide parameter identifiers.
Use the RTC when the drive must associate faults with plant events or change operation by calendar time. Confirm the required RTC and scheduling functions during drive selection because real-time clocks are not available in every drive.
Timestamped Fault Diagnostics
The drive can retain 40 sequential faults with the fault number, name, text description, and occurrence time. A valid clock lets maintenance personnel correlate a recorded event with external plant conditions. For example, an undervoltage fault recorded at night can be compared with the facility’s automatic supply-transfer activity; the timestamp supports that investigation but does not prove the transfer caused the fault.
| Recorded information | Diagnostic use |
|---|---|
| Fault number, name, and description | Identifies the drive-reported condition. |
| Date and time | Correlates the condition with plant events and operating schedules. |
| Sequence of up to 40 faults | Shows the order of recent drive events. |
Time-Based Drive and Relay Control
The RTC can start or stop the drive at selected hours on selected weekdays. It can also schedule different PI-controller setpoints outside office hours or on weekends. Other stated scheduling targets include reverse operation, constant speed, ramp changes, and drive relays. Relay scheduling can operate independently of drive operation, allowing the relays to perform other time-based control functions at the installation.
The available scheduling resources are three time channels, five time events, and three timers. The evidence does not specify whether the five events are shared or available per channel, so verify that allocation in the installed drive documentation before designing the schedule.
Configuration and Commissioning
- Set the RTC date and time using the available drive parameters.
- Define the required operating periods by hour and weekday, including separate office-hours and weekend behavior where needed.
- Assign each schedule to the required drive function, PI setpoint selection, or relay output.
- Verify every transition at its scheduled time and confirm that relay actions remain correct when they are intended to operate independently of the drive.
- Remove primary power, restore it, and confirm that the RTC retained the correct date and time. Investigate the battery-backed clock if it did not.
No parameter numbers, menu paths, battery service interval, or scheduling resolution are provided in the evidence. Obtain those model-specific details before commissioning or maintenance.
FAQ
Does the Vacon 100HVAC keep time when power is off?
Yes. Its RTC is battery-backed, so removing primary drive power does not stop the clock.
How many faults can the Vacon 100HVAC RTC timestamp?
The drive can record 40 sequential faults with the fault number, name, text description, and occurrence date and time.
What can the Vacon 100HVAC time channels control?
They can schedule drive start and stop, PI setpoint changes, reverse, constant speed, ramp changes, and relay operation. The stated resources are three time channels, five time events, and three timers, but the event allocation must be confirmed in the drive documentation.
