1-10 Product Overview
1560D-UM051D-EN-P – February 2005
Protection and Diagnostics Underload Z
(cont.)
If a sudden drop in current is detected, motor operation can be halted by
utilizing the underload protection of the MV Dialog Plus controller.
The MV Dialog Plus controller provides an adjustable underload trip
setting from 0 to 99% of the programmed motor full-load current rating.
Trip delay time can be adjusted from 0 to 99 seconds. The Bulletin 825
current converter module must be connected for this feature to be available.
Z Underload protection is disabled during slow speed and braking operations.
Excessive Starts/Hour
The MV Dialog Plus™ module allows the user to program the desired
number of starts per hour (up to 99). This helps eliminate motor stress
caused by repeated starting over a short time period.
Note: The base rating of the MV Dialog Plus is two starts (thirty seconds
each max.) per hour. Applications requiring more frequent starts, or longer
duration starts, should be reviewed with the factory to avoid equipment damage.
Overtemperature
The power module temperature is monitored during starting and stopping
maneuvers by thermistors. The thermistor is connected to the gate driver
board where it is processed, and the status is transmitted by fibre-optic
cable through the interface board to the control module. When an
overtemperature condition exists (>85°C), the control module trips and
indicates a temperature fault.
An overtemperature condition could indicate high ambient temperature,
overloading or excessive cycling. After the power module temperature is
reduced to allowable levels, the fault can be cleared (see page 9-1 for
instructions).
Metering Power monitoring parameters include:
• Three-phase current
• Three-phase voltage
• Power in kW (see note 5 below)
• Power usage in kWh (see note 5 below)
• Power factor (see note 5 below) during starting and stopping
(fixed at 0.85 during bypass)
• Motor thermal capacity usage
• Elapsed time
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