Fuse Information - Emerson Leroy Somer DIGISTART D3 User Manual

Safety Rating Mechanical
Information Data Installation

Inside delta installation, non-bypassed
Figure 4-16 Power connections - inside delta installation, non-bypassed
K1 F1
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/Mersen AJT fuses) can be used for Type 1 coordination according to IEC 60947-4-2 standard.
Fuses are not delivered with Digistart D3 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 Status Commissioning
1/L1 2/T1
3/L2 4/T2
5/L3 6/T3
E
COM1
RLO1
Operation Programming Diagnostics Application
K1
F1
U1(1) U2(4)
M
V1(2)
V2(5)
3
W1(3) W2(6)
K1
Technical Maintenance Options
Examples Data
Main contactor
(strongly recommended)
Semiconductor fuses
(optional)
Digistart D3 User Guide
Issue: F