ZF2/ZF3 SCR Power Controller
Installation
Rev 3
Ametek HDR Power Systems
7
CHAPTER 3 - Installation
3.1
Mounting the ZF2/ZF3
Determine the voltage and current ratings from the nameplate of the unit (refer to Table 1.1). Then
determine space and mounting hole requirements by referring to the outline drawing (at the Appendix)
that applies to your model’s current rating. Mount the unit so the line and load connections are at the
top and ensure that upward airflow over the heat sink fins is unrestricted. On high current models,
allow adequate clearance for routing the relatively large diameter input and output lines.
3.2
Input/Output Wiring
Using appropriately sized and insulated conductors for the voltage and current ratings of your model,
make connections as shown in Figure 3.4. (Refer to Table 3.1 for wire size information). Torque
specifications of bolted connections can be found in Table 7.2.
A ground wire is required for proper operation. Use a 10 AWG or larger wire.
NOTICE
Use copper conductors
rated 75 ºC minimum for all model current ratings.
The ZF2/ZF3 is not phase-rotation sensitive. That is, three-phase input power can be
connected in any sequence to terminals L1, L2, and L3, and will not cause an out-of-
phase condition.
The fuses included are NOT meant for over current protection, separate branch circuit protection is
required.
On the “internal” side of the ZF2/ZF3, the wire from L2 should connect to the appropriate tap of
transformer T1, depending on the line voltage to be used. Check the T1 connection by opening the
ZF2/ZF3 cover; T1 terminal voltages are clearly marked. Reference Chapter 3.7.
Table 3.1 Wire Size Information
Model
Size Wire/Cable
60 A
8 to 0 AWG
90 A
8 to 0 AWG
120 A
8 to 0 AWG
180 A
6 to 250 MCM
225 A
6 to 250 MCM
3.3
Fan Wiring (applicable to models rated 90 A and higher)
ZF2/ZF3 models rated 90 A and higher with cooling fans require 120 Vac power which must be
supplied by the customer. Fan power should be connected to terminals 21 and 22 as shown in Figure
3.1. Refer to Table 1.2 for fan power requirements by model.
The ZF2/ZF3 terminals available for the 120 Vac fan connections are shown Figure 3.1 and in the
schematic at the rear of this manual. Optional 220 Vac fans are available.
WARNING
Branch circuit overcurrent protection required is to be provided in
accordance with the national and local codes of the inspecting authority.
Summary of Contents for ZF2 SCR Series
Page 6: ...Table of Contents ZF2 ZF3 SCR Power Controller iv Ametek HDR Power Systems Rev 3...
Page 8: ...Safety Instructions ZF2 ZF3 SCR Power Controller 2 Ametek HDR Power Systems Rev 3...
Page 24: ...Operation ZF2 ZF3 SCR Power Controller 18 Ametek HDR Power Systems Rev 3...
Page 32: ...Troubleshooting ZF2 ZF3 SCR Power Controller 26 Ametek HDR Power Systems Rev 3...
Page 51: ...Notes...
Page 52: ...503 Lakeview Plaza Blvd Ste C Worthington Ohio 43085 USA...
