Honeywell MCSS, MCSP Installation Instructions

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62-0413-02

MCSS/MCSP Current Switches

CAUTION

WARNING

INSTALLATION INSTRUCTIONS

Risk of electrical shock. Can cause severe injury, property damage or death.

Disconnect and lock out all power sources before installation as severe injury or death may result from electrical shock due to contact with high voltage wires.

Never rely on the LED’s of the MCSS-A/MCSP-A to determine whether power is present at the current switch. The Red LED will indicate whether the current is above the adjustable trip point. The Blue LED will indicate that the current is below the adjustable trip point.

The MCSS-A and MCSP-A Current Switches should be used on Insulated Conductors Only! The current switch may be mounted in any position using the (2) #8 x 3/4” Tek screws and the mounting holes in the base. Leave a minimum distance of

INSTALLATION

Make sure that all installations are in compliance with all national and local electrical codes. Only qualified individuals that are familiar with codes, standards, and proper safety procedures for high-voltage installations should attempt installation. The current switches will not require external power, since the power for the current switch is induced from the conductor being monitored.

1” (3 cm) between the current switch and any other magnetic devices such as contactors and transformers.

For applications in which the normal operating current is below the 0.32Amps (MCSS-A) or 0.70Amps (MCSP-A) trip point (See Figure 5 below), the conductor being monitored may be looped through the sensor 6 times giving you a total operating current of 6X the original current. Example: A small fan operating at 0.2A should be wrapped through the sensor 7 times to give you a total operating current of 1.4 Amps flowing through the MCSS-A or MCSP-A.

This product is not intended to be used for Life or Safety applications. This product is not intended for use in any hazardous or classified locations.

For applications in which the normal operating current is greater than 150 Amps or for conductor diameters larger than

0.530” (1.35 cm) in diameter, an external 5 Amp Current Transformer (5A CT) must be used as shown in Figure 6 below. Remember that the secondary of the 5A CT must be shorted together before the power may be turned onto the monitored device.

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MCSS/MCSP CURRENT SWITCHES

M33395

NUMBER 8 X 3/4 (19) TEK SCREW

(QUANITY 2 PER UNIT)

Use Copper Conductors Only

Output: 0.5A@

36.0 Vac/V

Sense Range: 0.2-150A TRIP ON = Above 0.2A

SPECIFICATIONS

Table 1. Operating specifications.

Core

Model

Typ e

MCSS-F Solid Fixed < 0.20 Amps 0.50 Amp

MCSP-F Split Fixed < 0.55 Amps

MCSS-A Solid Adjustable 0.32 - 150 Amps 1.00 Amp

MCSP-A Split Adjustable 0.70 - 150 Amps

Switch

Type Trip Point

Output

Switch Rating

@ 36 VAC/

VDC

@ 36 VAC/

VDC

Max. Sensing

Current Voltage

Max.

Continuous

Current

Max. Current

for

6 seconds

Max. Current

1 second

600 VAC 158 Amps 240 Amps 600 Amps

TRIP OFF ON

Output: 1.0A@

NUMBER 8 X 3/4 (19) TEK SCREW

(QUANITY 2 PER UNIT)

36.0 Vac/Vdc

TRIP

ADJ

TRIP ON = Above Trip Point

Adj. Range: 0.32-150A

Use Copper Conductors Only

for

Fig. 1. MCSS-F

MCSP-F

Fig. 2. MCSP-F

M33397

Fig. 3. MCSS-A

M33398

M33396

Fig. 4. MCSP-A

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INSULATED

M33402

DDC CONTROLLER

RELAY/

CONTACTOR

TRANSFORMER

DI STATUS

DO (RELAY COIL OR CONTACTOR)

24 VAC COIL

24 VAC

120 VAC

LINE

CONDUCTOR

MCSS/MCSP CURRENT SWITCHES

M33399

Fig. 5. Wires through sensors.

600:5 RATIO 5A C.T.

WIRE NUT

Fig. 6. Using a current transformer.

WIRING

Honeywell recommends the use of a two conductor 16 to 22 AWG shielded cable or twisted pair copper wire only for all current switch applications. A maximum wire length of less than 30 meters (98.4 feet) should be used between the MCSS-A and MCSP-A current switches and the Building Management System or controller.

NOTE: When using a shielded cable, be sure to connect

only one (1) end of the shield to ground at the controller. Connecting both ends of the shield to ground may cause a ground loop.

When removing the shield from the sensor end, make sure to properly trim the shield so as to prevent any chance of shorting. The current switch output terminals represent a solid-state switch for controlling both AC and DC loads and is not polarity sensitive. The recommended torque to be used on the terminal block connections is 0.67 Nm or 5.93 in-lbs.. The aperture (hole) size of the current switch is 0.53” (1.35 cm) and will accept a 1 AWG maximum wire diameter.

See Figure 7 and Figure 8 for two different current switch applications using your Building Management System (DDC/ PLC Controller). Figure 7 is showing the use of the Go/No Go Current Switch as a Digital Input to your DDC Controller, whereas Figure 8 is showing you how to use the Go/No Go Current Switch in conjunction with your building management system to control a fan or pump for example.

M33400

DIGITAL INPUT 1

BUILDING

MANAGEMENT

SYSTEM

M33401

Fig. 7. Digital circuit.

Fig. 8. Analog circuit.

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MCSS/MCSP CURRENT SWITCHES

Calibration of Adjustable Trip Point (MCSS-A, MCSP-A models only)

The adjustable current switch has an operating range of 0-150 Amps. Do not exceed! The adjustable current switch comes with its fifteen-turn adjustment potentiometer set to the 100 Amp trip point position. The adjustable current switch can be used to monitor Under Load, Normal Load, and Over Load conditions, depending on how it’s set. The procedure below is for the Normal load condition for part numbers MCSS-A & MCSP-A.

Table 2. Troubleshooting.

Problem Solution

Red LED is on but the current switch didn’t activate( -A models) Current switch didn’t activate( - F models)

Red LED didn’t turn on and the current switch didn’t activate (- A models) Current switch didn’t activate ( -F models)

Sensor doesn't switch at all, regardless of current level. (-A models)

Disconnect the wires from the current switch output. Measure the resistance across the contacts with an Ohmmeter.

Verify that the conductor you are monitoring is above the adjustable trip point. If the sensor is monitoring less than the minimum trip point, see Fig. 5.

Adjustment potentiometer is probably set to its maximum or minimum position. Turn the Pot counter-clockwise all the way and verify if the LED switches from Red to Blue.

Normal Loads (MCSS-A, MCSP-A models only)

With current flowing through the aperature of the MCSS-A and MCSP-A current switches, first verify that the Blue LED is on. If the Blue LED is on, now slowly adjust the potentiometer clockwise until the Red LED just turns on and stop immediately. This will set the trip point at your normal operating load current. If the RED LED is on after initial power up, this means that you will need to slowly adjust the potentiometer counter-clockwise until the Blue LED turns on and then slowly adjust the potentiometer clockwise until the Red LED just turns on and stop immediately. The adjustable current switch is now tripped. Now verify the output with an Ohmmeter to verify that the contacts of the switch are approximately 0.200 Ohms. The adjustable current switch Hysteresis (Dead Band) is typically 10% of the trip point.

By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys’ fees, arising out of, or resulting from, any modification to the literature by you.

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