C-DIAS SAFETY CPU
CSCP 012
1.6
Page 15
Electrical requirements
The Safety modules' electrical supply must also be provided over the C-DIAS bus in a
stand-alone system. A different type and method of supplying energy is not allowed.
The C-DIAS bus system's external 24 V supply voltage must be generated by a PELV
power supply.
Rated supply voltage
+24 V DC (C-DIAS bus)
Supply voltage range including
ripple
M18 V
M30 V
Voltage supply from C-DIAS bus
+5 V
Current consumption of C-DIAS
bus (+5 V supply)
Typically 50 mA
Current consumption of C-DIAS
bus (+24 V supply)
Typically 90 mA
Maximum interrupt time for volt-
age interruptions
10 ms
Standard
UL 508 (E247993)
Table 6: Electrical requirements
Electrical requirements for UL
IMPORTANT:
The device was tested in accordance with the UL 508 Norm as a low voltage limited power
circuit (LVLC - limited voltage/limited current). To meet the standard requirements, the
device must be powered by a galvanically isolated source (+24 V DC), which is protected
with a UL-certified 4 A fuse (UL 248) in the secondary circuit. If the device is powered by
two galvanically isolated sources, one to power the electronics and one for the frequency
output, each source must be equipped with a UL-certified 4 A fuse (UL 248) in the second-
ary circuit.
Input
18 - 30 V DC
4 x 5 mA at +24 V
Output
(General use Ampere Rating)
18 - 30 V DC
2 A per channel,
maximum 2 A complete module
a
