FEC DSP1500 (SAN3) User Manual
Page 5
enFORCE
Operation Manual
PAGE 4 - 5
Chapter 4: System Setup and Wiring
4.3 Calculating Circuit Protection
The chart above shows nominal motor ratings for standard press motors, along with the power
requirements for each SAN unit. Use the formula below to calculate transformer secondary fuse or
circuit breaker sizes.
Transformer (VA)
1.5 x Secondary Voltage 3 = Secondary Fuse Size
Example:
1000 (VA)
1.5 x 200 VAC 3 = 4.33 Amps (Use 5 Amp Fuses)*
* Use a fuse or circuit breaker with the next available highest rating. Due to the high inrush current
at power up, it is recommended to use “Slow Blow” type fuses or fuses rated for motor loads such
as Bussman type FRS or FRN.
RATED VALUES FOR CALCULATING CIRCUIT PROTECTION
MOTOR
# OF SAN3 UNITS
KVA PER
MOTOR TYPE
WATTAGE
SAN3 UNIT
PER 1 KVA
SAN3 UNIT
R1
60
SAN3-24S
8
.125
R2
80
SAN3-24S
6
.167
R3
200
SAN3-40S
2.5
.40
R4
1500
SAN3-120S
0.5
2.0
R5
3000
SAN3-120S
0.25
4.0