User Guide

Flowrite EA 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features Technical Instructions
Document Number 155-717
July 11, 2011
Siemens Industry, Inc. Page 13
Wiring
Do not use auto-transformers. Use earth ground isolating step-down Class II power
supplies.
Determine supply transformer rating by summing total VA of all actuators used.
Determine the rating for Class 2 step-down transformer is 100 VA and consider the
following requirements:
SKB62UA = 17 VA SKC62UA = 28 VA SKD62UA = 17 VA;
A maximum of four actuators can be powered by one transformer (80% of
transformer VA). Operating more than four SK series actuators requires additional
transformers or separate 100 VA power supplies.
The position output signal U will switch from 0 to 10 Vdc to 4 to 20 mA when a 4 to
20 mA input signal is selected and used on the Y terminal.
Wiring Diagrams
GB1M
G0
Y1
GM
Z
G0
Y
U
BM
G (SP)
F1
Y1
N1
B1
G0 (SN)
32
1
M
Sensor
Temperature Limiter
Controller
Actuator
B1
F1
N1
Y1
AC 24 V
EA1074R1
Figure 19. Terminal Connections.
24 Vac
G System potential (SP)
G0 System neutral (SN)
Y Control input signal 0 to 10 (30) Vdc or 4 to 20 mA
M Measuring neutral
U Position indication 0 to 10 Vdc or 4 to 20 mA (see Table 1)
Z Override input.
c1
3
45
EA1076R1
Figure 20. Auxiliary Switches.
Table 1. Actuator Output Signal U.
Receiving Impedance
Actuator Input Signal
Low
(<500 ohm)
High
(>10K ohm)
0 to 10 Vdc 0 to 20 mA 0 to10 Vdc
4 to 20 mA 4 to 20 mA 2 to 10 Vdc