SCZF1 SSR Power Controller
Description
Rev 2
Ametek HDR Power Systems
3
CHAPTER 1 - Description
1.1 General
Description
The SCZF1 is a Single-phase, zero-fired power controller, and can operate with a wide variety of input
signals and line voltages up to 575 Vac and currents ranging from 15 through 65 amperes. The
SCZF1’s average output voltage is proportional to its input signal. The SCZF1 SSR Series utilizes an
isolated base Solid-State-Relay (SSR) Module which contains two SCRs connected back to back. The
firing circuit is based on a common integrated circuit. Terminals are provided to ease installation.
1.2 Application
A variable time base firing circuit is used to provide precise control of power to resistive loads. These
units should never be used on inductive loads. However, they are versatile enough to be used in
place of mechanical contactors and mercury relays on dryers, kilns, ovens, environmental chambers,
extruders, molding equipment, and other types of equipment which use resistive heat.
1.3 Specification
Specifications for the SCZF1 SSR power controller are given in Tables 1.1 and 1.2.
Table 1.1 SCZF1 Model Number Breakdown
SCZF1 – 480 – 25 – NO – LF – 01
1.4
Option NO/NC (Thermostat)
Heatsink Thermostats (Option NO or NC) provide a dry contact either Normally Open (NO) or Normally
Closed (NC).
1.5
Option LF (Load Failure Alarm)
Load Failure Alarm detects changes in the load and should be used when the “Load” is made up of
several parallel paths. The load failure alarm will determine when 5% or more of the load has failed.
A relay output is provided.
120 Vac -
120
240 Vac -
240
400 Vac -
400
480 Vac -
480
575 Vac -
575
15 A rms -
15
25 A rms -
25
40 A rms -
40
65 A rms -
65
N.O. Thermostat -
NO
N.C. Thermostat -
NC
Load Failure Alarm -
LF
Can have multiple selections
4-20 mA -
01
0-10 Vdc -
02
0-5 Vdc -
03
Manual Pot input -
05
Others -
xx
