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Safety
Rating
Mechanical
Information
Data
Installation
Inside delta installation, non-bypassed
Figure 4-14 Power connections - inside delta installation, non-bypassed
4.4
Fuse information
4.4.1
Power supply fuses
Semiconductor fuses can be used for Type 2 coordination (according to IEC 60947-4-2 standard) and to reduce the risk of damage
to SCRs from transient overload currents.
HRC fuses (such as Ferraz AJT fuses) can be used for Type 1 coordination according to IEC 60947-4-2 standard.
Fuses are not delivered with Digistart IS soft starters.
NOTE
Adaptive Control controls the motor's speed profile, within the programmed time limit. This may result in a higher level
of current than traditional control methods.
CAUTION
For applications using Adaptive Control to soft stop the motor with stop times greater than 30 seconds, motor branch protection
should be selected as follows:
standard HRC line fuses: minimum 150% motor full load current
motor rated line fuses: minimum rating 100/150% motor full load current
motor control circuit breaker minimum long time setting: 150% motor full load current,
motor control circuit breaker minimum short time setting: 400% motor full load current for 30 seconds
Fuse selection is based on a 400% FLC start for 20 seconds in conjunction with standard published starts per hour,
NOTE
duty cycle, 40°C ambient temperature and up to 1000 m altitude. For installations operating outside these conditions,
consult your local supplier.
These fuse tables contain recommendations only. Always consult your local supplier to confirm the selection for your
particular application.
26
Electrical
Keypad
Quick Start
Installation
and
Commissioning
Status
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Operation Programming Diagnostics Application
Technical
Maintenance Options
Examples
Data
KM1
Main contactor
F1
Semiconductor fuses
(optional)
Digistart IS User Guide
Issue: 4
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