Hach sc100TM 3.3 Alarms and Relays

Installation

15

3.3 Alarms and Relays

The controller is equipped with three unpowered relays rated 100–230 V ac,

50/60 Hz, 5 amp resistive maximum. See the sensor manual for relay

setup details.

3.3.1 Connecting the Relays

The relay connector accepts 18–12 AWG wire (as determined by load

application). Wire gauge less than 18 AWG is not recommended.

Danger: Relay loads must be

resistive. User must externally

limit current to the relays to

5 Amps by use of a fuse or

breaker.

The controller contains three relays designed for use with high voltage (greater

than 30V-RMS and 42.2V-PEAK or 60 V dc). Refer to Figure 3-17 for connection

information. The wiring is not designed for low voltage connections. Relay must

not be powered from the same wiring used to power the controller. See the sensor

manual for relay setup details.

Danger: ac power terminals are

designed for single wires. Do not

use more than one wire in each

terminal.

The Normally Open (NO) and Common (COM) relay contacts will be connected

when an alarm or other condition is active. The Normally Closed (NC) and

Common relay contacts will be connected when an alarm or other condition

is inactive or when power is removed from the controller.

Figure 3-17 Alarm and Relay Connections

NCNCNC COMCOMCOM NO

F1

F2

NONO

RELAYCRELAYBRELAYA

J1

J2

J4

S1

NETWORK

INTERFACE

CARD

J3

J5

J6

U5

U9 J5J5

NCNCNC COMCOMCOM NO

F1

F2

NONO

RELAYCRELAYBRELAYA

J1

J2

J4

S1

NETWORK

INTERFACE

CARD

J3

J5

J6

U5

U9 J5J5

J5 J6 J7

3

2

1

RELAYA RELAYB RELAYC

Disconnect

Power

Contents

Main Table of Contents Section 1 Specifications Specifications are subject to change without notice. Section 2 General Information 2.1 Safety Information 2.1.1 Precautionary Labels 2.2 General Product Information Section 3 Installation Table 3-1 Customer Supplied Items 3.1 Mechanical Installation 3.1.1 Controller Dimension Illustrations Figure 3-4 Panel Mount Cut-out Dimensions Figure 3-5 Conduit Hole Dimensions 3.1.2 Using the Optional Sun Shield Figure 3-7 Mounting the Controller in the Sun Shield 3.1.3 Mounting the Controller Page 3.2 Electrical Installation DANGER 1. High voltage barrier 2. Unsnap the barrier latch then pull out to remove the barrier. 3.2.1 Installation in Conduit 3.2.2 Installation Using a Power Cord 3.2.3 Wiring for Power at the Controller 7. Reinstall the high-voltage barrier and latch to secure. Figure 3-14 Wiring Connections Table 3-2 Power Wiring Information Figure 3-15 Local Disconnect for Power Cord Figure 3-16 Local Disconnect for Hard-wired Line Power 1. Power terminal 2. Power cord strain relief 1. Power terminal 2. Conduit strain relief 3.3 Alarms and Relays 3.3.1 Connecting the Relays 3.3.2 Connecting the Analog Outputs J6 J5J5 RELAYCRELAYBRELAYA Figure 3-18 Analog Output Connections 3.4 Connecting/Wiring the Sensor Cable Figure 3-20 Hard-wiring the sensor RELAY1 From Probe J6 3.5 Connecting the Optional Digital Output RELAY3RELAY2 J1 J2 J4 NETWORK INTERFACE CARD J3 S1 Figure 3-21 Network Card Position in the Controller Table 3-5 Network Connections at Terminal Block J1 1. J2Network card header 2. Mounting hole (3) 3. Network card placement 4. J1 Terminal Detail A RS232 Connections to Customer-supplied Computer 9-pin D Subminiature Connector Common 5 9 8 7 6 Section 4 Maintenance 4.1 Cleaning the Controller 4.2 Fuse Replacement Section 5 Replacement Parts Replacement Items Accessories Section 6 How to Order U.S.A. Customers Information Required International Customers Technical and Customer Service (U.S.A. only) Section 7 Repair Service Section 8 Limited Warranty Limitations Limitation of Remedies Section 7 Compliance Information Product Safety Immunity EN 61326 (EMC Requirements for Electrical Equipment for Measurement, Emissions Canadian Interference-causing Equipment Regulation, IECS-003, Class A FCC PART 15, Class A Limits Index