SSC Series Electronic Valve Actuator

Product Description

The SSC series actuator requires a 24 Vac, Class 2 supply and provides a 0 to 10 Vdc or Floating (three-position) control signal. The actuator controls a Powermite™ 599 Series MT Series valve with a 7/32-inch (5.5-mm) stroke.

Warning/Caution Notations

Product Information

Product Numbers

Contents

• One SSC actuator

Estimated Installation Time

20 minutes

Required Tools

• Small Phillips head screwdriver
• Small flat-blade screwdriver
• Wire stripper

Prerequisites

WARNING:

• If mounting the actuator to a valve already in line, either close the shut-off in the piping (upstream first, then downstream) or switch off the pump to allow the differential pressure in the valve to drop.
• Disconnect the controller power before replacing the actuator.
• If high voltage cable is co-located with the SSC actuator, conduit or shielded wire may need to be used.

CAUTION:

Before applying power, make certain a valve is connected to the actuator.

If applying power to the actuator when a valve is not connected, the actuator will respond to a control signal and the shaft will extend until it reaches its maximum end stop. Thereafter, it will not respond to any signal.

If this occurs, disconnect the power. Turn the manual position indicator on the top of the actuator to the 0 position and verify the actuator shaft retracts completely. See Figure 4.

Connect a valve to the actuator and reapply the power. The actuator will return to normal operation.

Mounting

The vertical position is recommended for mounting the actuator. See Figure 1.

Figure 1. Acceptable Actuator Mounting Positions.

Figure 1 depicts acceptable mounting positions for the SSC actuator. It shows the actuator mounted vertically, with arrows indicating acceptable angles up to 45 degrees from vertical in either direction. It also shows an unacceptable horizontal mounting position.

CAUTION:

Mount actuator at a 45° angle from vertical when using on low pressure steam systems to reduce radiant heat that can damage the actuator.

Installation

Removing the actuator from a valve

1. Remove the terminal cover (Figure 2) using a Phillips head screwdriver.
2. Identify and disconnect wiring from the terminals.
3. Remove wiring retention screw.
4. Do one of the following:
   • Remove plenum cable adapter and plenum cable;
   • Remove flex conduit.
5. Loosen the actuator coupling on the valve (Figure 3, reverse No. 2).
6. Remove the actuator from the valve.
7. For 3/8-inch flex conduit applications, complete wiring as follows:
   • Discard plenum cable adapter.
   • Insert flex conduit into flex conduit adapter and secure in place with wiring retention screw.
   • Route wiring through flex conduit for wiring terminations.

   NOTE: Insert wiring retention screw in hole of the flex conduit adapter. (The hole nearest the wiring terminals is to secure the terminal cover in place.)

8. Connect wires to wiring terminals per the Wiring section of this document.
9. Secure the terminal cover in place over the wiring terminals (Figure 2) using a Phillips head screwdriver.
10. Place the actuator on the valve and firmly hand-tighten (Figure 3).

CAUTION:

Hand-tighten the actuator to the valve. Using tools to tighten the assembly together, will cause damage. The installation is complete.

Figure 2. SSC Actuator Components.

Figure 2 illustrates the components of the SSC Actuator. It shows the terminal cover, wiring terminal with removable terminal block, wiring retention screw, flex conduit adapter, and plenum cable adapter (optional use).

Mounting an Actuator on a Valve

1. If you are attaching the actuator to a new valve, remove the protective plastic cap from the valve stem.
2. Turn the manual position indicator on the top of the actuator to the 0 position (Figure 11).
3. Using a Phillips head screwdriver, remove the terminal cover (Figure 2).
4. Remove wiring retention screw.
5. Remove plenum cable adapter.
6. For plenum applications, complete wiring as follows:
   • Route cable through plenum cable adapter so there is sufficient cable to complete wiring terminations.
   • Insert plenum cable adapter into flex conduit adapter and secure in place with wiring retention screw.
   • Continue with Step 8.

   NOTE: Insert wiring retention screw in hole of the flex conduit adapter. (The hole nearest the wiring terminals is to secure the terminal cover in place.)

Figure 3. Coupling Actuator to Valve.

Figure 3 shows how to couple the actuator to the valve. It illustrates the actuator being attached to the valve stem, with a coupling mechanism and a screw for securing it.

Manual Override

To position the actuator manually, use the manual override knob in the center of the position indicator (Figure 4).

Figure 4. Manual Override.

Figure 4 illustrates the manual override feature. It shows a knob on the actuator's position indicator. Arrows indicate that turning the knob counter-clockwise retracts the shaft (A), and clockwise extends the shaft (B).

Calibration Stroke

The SSC Series writes its calibration stroke parameters to nonvolatile memory on the first start-up of the actuator. Successive start-ups bypass the calibration stroke unless the memory is manually cleared. If installing the actuator on a different valve (such as on a replacement valve), manually clear the calibration stroke from memory as follows:

1. Remove the terminal cover using a Phillips head screwdriver.
2. Locate hole on the circuit board with the shorting bars (Figure 5).
3. With power applied to the unit, insert and gently twist a flat-blade screwdriver to electrically connect the shorting bars. The SSC... then performs a new calibration stroke.
4. Secure the terminal cover back in place.

Figure 5. Manually Clearing Calibration Stroke from SSC61U and SSC61.5U Nonvolatile Memory.

Figure 5 shows the location of the shorting bars on the circuit board for manually clearing the calibration stroke. It points to the terminal cover, wiring terminal block, and the shorting bars.

Wiring

• All wiring must conform to NEC and local codes and regulations.
• Use earth ground isolating, step-down Class 2 transformers. Do not use autotransformers.
• Determine the supply transformer rating by summing the total VA of all actuators used. The maximum rating for a Class 2 step-down transformer is 100 VA.
• Do not power more than 10 actuators with one transformer. (Use 0.5 amp on secondary actuators.)

Figure 6. SSC81U NSR Floating Control.

Figure 6 is a wiring diagram for the SSC81U NSR Floating Control. It shows connections between a controller and the actuator, including terminals Y2, Y1, G, and NEUT, powered by a 24 Vac Class 2 transformer.

Figure 7. For Non-Triac Driven Controllers.

Figure 7 shows a wiring diagram for non-triac driven controllers. It illustrates the connections for the SSC81.5U Floating Control SR Hot-Switch, detailing G, G0, Y1, and Y2 terminals and their functions.

Figure 8 For Triac Driven Controllers, (TEC, DXR, and Others).

Figure 8 is a wiring diagram for triac-driven controllers (TEC, DXR, and others). It depicts the SSC81.5U Floating Control SR Hot-Switch wiring, showing controller and actuator connections for G, G0, Y1, and Y2.

CAUTION:

Terminals must be properly wired for correct function and full life of the actuator.

Because the triacs on TECs and DXRs always switch hot power, add a 1000 Ohm 2-Watt resistor across each of the binary (Y1, Y2) outputs. The two resistors must be used for all hot-switching triacs not just TEC and DXR.

Figure 9. SSC81.5U Floating Control SR Neutral Switching Applications.

Figure 9 presents a wiring diagram for SSC81.5U Floating Control SR Neutral Switching Applications. It shows controller and actuator connections for G, G0, Y1, and Y2, powered by a 24 Vac transformer.

NOTE: For proper operation, it is recommended no more than three actuators be assigned to any single control signal.

Wiring Diagram (Proportional Control)

Figure 10. SSC61U, NSR and SSC61.5U, SR, 0 to 10 Vdc Proportional Control Wiring Diagram.

Figure 10 is a wiring diagram for the SSC61U, NSR and SSC61.5U, SR, 0 to 10 Vdc Proportional Control. It illustrates connections between an electronic controller and the actuator, including terminals Y, G, G0, and NEUT, powered by a 24 Vac transformer. It notes that Y is for the 0 to 10 Vdc control signal, G is system potential, G0 is system neutral, and an optional R1 resistor (500 ohm) can be used for 0-20 mA operation (*4 to 20 mA with optional resistor).

Start-up

Check the wiring and the position indicator (Figure 11).

NOTE: 0 and 1 markings are intended for reference only, and not stroke measurement.

Figure 11. Position Indicator (Shown in 0 Position).

Figure 11 shows the actuator's position indicator, which is currently in the 0 position, indicating a retracted shaft.

Troubleshooting

Check the wiring for the proper connections.

References

Dimensions

Figure 12. SSC Actuator Dimensions in Inches (Millimeters).

Figure 12 provides the dimensions of the SSC Actuator. The main body has dimensions of 4.5 inches (115.1 mm) in length and 3.5 inches (89 mm) in height. The overall length including the connection end is 5.5 inches (140 mm). The width of the connection end is 4.4 inches (110.8 mm) and the width of the main body is 2 inches (48 mm). The diagram includes various measurement callouts.

Service Envelope

Minimum access space recommended:

• 8 inches (200 mm) above the actuator.
• 8 inches (200 mm) beside the terminal cover.