Alarms And Relays; Wiring Relays - Hach sc200 User Manual

Table 1 AC power wiring information (AC powered models only)
Terminal
Terminal number
description
1 Hot (L1)
2 Neutral (N)
— Protective Earth
(PE) Ground lug
Table 2 DC power wiring information (DC powered models only)
Terminal number Terminal
description
1 +24 V dc
2 24 V dc return

Alarms and relays

The controller is equipped with four unpowered, single pole relays rated
100-250 VAC, 50/60 Hz, 5 amp resistive maximum. Contacts are rated
250 VAC, 5 amp resistive maximum for the AC powered controller and 24
VDC, 5A resistive maximum for the DC powered controller. The relays are
not rated for inductive loads.

Wiring relays

W A R N I N G
Potential Electrocution Hazard. Always disconnect power to the
instrument when making electrical connections.
W A R N I N G
Potential fire hazard. The relay contacts are rated 5A and are not fused.
External loads connected to the relays must have current limiting
devices provided to limit current to < 5 A.
Wire color code
Wire color code
for North
for Europe
America
Black Brown
White Blue
Green Green w/yellow
stripe
Wire color code Wire color code
for North for Europe
America
Red Red
Black Black
W A R N I N G
Potential fire hazard. Do not daisy-chain the common relay connections
or jumper wire from the mains power connection inside the instrument.
W A R N I N G
Potential electrocution hazard. In order to maintain the NEMA/IP
environmental ratings of the enclosure, use only conduit fittings and
cable glands rated for at least NEMA 4X/IP66 to route cables in to the
instrument.
AC line (100—250 V) powered controllers
The wiring compartment is not designed for voltage connections in excess
of 250 VAC.
24 VDC powered controllers
The 24 VDC controller relays are designed for connection to LOW voltage
circuits (i.e., voltages less than 30 V-RMS, 42.2 V-PEAK or 60 VDC. The
wiring compartment is not designed for voltage connections above these
levels.
The relay connector accepts 18-12 AWG wire (as determined by load
application). Wire gauge less than 18 AWG is not recommended.
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 (unless the Fail Safe is set to Yes) or when power
is removed from the controller.
Most relay connections use either the NO and COM terminals or the NC
and COM terminals. The numbered installation steps show connection to
the NO and COM terminals.
English 13