Setra Systems SSC-2S, SSC-4S, SSC-4H, SSC-2H Operation And Installation Instructions Manual

Introduction

The Sure-Set Current Switch (SSC) Series
of digital output switches are noninva­sive devices designed to detect current
owing through a cable or wire. A cost
eective solution for monitoring on and
o status or proof of operation, these
devices are ideal for monitoring the cur­rent load on motors driving fans, pumps,
chillers, compressors and blowers. The
Model SSC Current Switch has a univer­sal power supply. Excitation is magneti­cally induced from the current carrying
conductor (wire or cable) being sensed,
making these devices completely self­powered.

Warning: Risk of Electric Shock

Disconnect power supply before mak­ing electrical connections. Contact
with components carrying hazardous
voltage can cause electrical shock and
may result in severe personal injury or
death.

Warning: Risk of Arc-Flash

Disconnect power supply before mak­ing electrical connections. Contact
with components carrying hazardous
voltage can cause electric shock and
may result in severe personal injury or
death.

Setup and Adjustments

The Sure-Set Model SSC series of switches

employ a unique method to set the oper­ating set point of the device. The Sure-Set
Current Switch is designed to allow the
installer to select the operating setpoint
prior to opening the electrical enclosure.

Since the Sure-Set does not require cali­bration on a powered and operating load,
the safety hazards and Personal Protec­tive Equipment (PPE) required for protec­tion against Arc-Flash are not necessary!
In fact, the installer or site engineer can
pre-set all Sure-Set Current Switches used
for a particular installation prior to deliver­ing the parts to the job site. The installer
selects the proper Sure-Set model for
the application (230 VAC or 480 VAC) and
veries the Motor HP for the system to be
monitored.

Select Operating Range

1. Verify the motor Full Load HP for the
system to be monitored.

2. Verify the motor operating voltage.

3. Verify that the proper Sure-Set model
was selected to monitor the motor
used in the system. (Sure-Set Current
Switches are available for 230 VAC
and 480 VAC motors both in standard
low and high HP ranges.)

4. Set the Sure-Set operating setpoint
to the motor Full Load HP by rotating
the range selector switch on top of
the Sure-Set to the proper motor HP
(see Fig. 2). The Sure-Set operating
setpoint is now set to properly moni­tor the motor operation. No calibra­tion on a live load is necessary.

65 (2-9/16)

69 (2-23/32)

27 (1-1/16)

Fig. 1 Model SSC

Dimensions

mm(in.)

Model SSC-2S/SSC-2H/SSC-4S/SSC-4H

Operation and Installation Instructions

!

!

Fig. 2 HP Range Selector

Installation

Mounting

1. Shut o all power to the enclosure
prior to installing.

2. Remove the Sure-Set mounting
bracket from the main housing.

3. Using the two screws (included), at­tach the mounting bracket to the
back of the electrical enclosure. (A
piece of double side tape is included
in the hardware kit to assist holding
the mounting bracket while attach­ing the screws.

4. Snap the SSC into place on the
mounting bracket.

Fig. 3 Model SSC Typical Wiring

Wiring

1. Disconnect power to the conductor
cable from the power source prior to
proceeding.

2. Snap the split core around the power
conductor cable, and close the hous­ing until the latch snaps shut.

3. Wire SSC output terminals to the
control box Digital Input (DI) ter­minal (30 V max. terminal voltage).

Note: the output switch contacts are solid
state, and they work just like dry contacts.
When the output switch is closed, less than
1 ohm is present; when the output switch is
open, more than 1 ohm is present.

4. Close the enclosure and reconnect
power to the power conductor cable.
(For wiring example, see Figure 3.)