Weidmuller G168 User Manual

Weidmuller Ltd.
10 Spy Court
Markham, ON L3R 5H6
Tel: [phone]
Fax: [phone]

Weidmuller Inc.
821 Southlake Blvd.
Richmond, VA 23236 U.S.A.
Tel: [phone]
Fax: [phone]

ISO 9001 Registered

Electronic Interface Modules

G168 Ultra SlimPak®

AC Input, Field Configurable Limit Alarm

• field configurable via DIP switches for different input­output combinations

• provides relay contact closure(s) at a preset AC input
level

• field configurable input ranges

• setpoints programmable HI or LO and failsafe or non­failsafe

• LED trip and input indicators

• 9 to 30Vdc powered

• CSA approved, UL recognized, CE marked

Description

Diagnostic LEDs

Output

Operation

Dynamic Deadband

The Ultra SlimPak G168 is a DIN rail mount, AC voltage or current input limit alarm with dual setpoints and
two contact closure outputs. The field configurable input and alarm functions offer flexible setpoint capability.
Input voltage spans from 100mV to 250Vac and input current spans from 10mA to 100mAac can be field
configured. For current input spans of 1 to 5 Amps a 0.1M (5W) shunt resistor (Model# C006) is available.
The G168 is configurable as a single or dual setpoint alarm, with HI or LO trips and failsafe or non-failsafe
operation. Also included are adjustable deadbands (0.25 to 5% of full scale input) for each setpoint. The
G168 will accept any DC voltage between 9 and 30Vdc.

The G168 is equipped with three front panel LEDs. The first is a dual function LED labeled IN (input). This
green LED indicates the presence of DC power and input signal status. Active DC power is indicated by an
illuminated LED. If this LED is off, check DC power and wiring connection. If the input signal is more than
110% of the full scale range, the LED will flash at 8 Hz.
Two red TRIP LEDs indicate the re-lay state for each setpoint. An illuminated red LED indicates the tripped
condition.

The G168 is equipped with two SPDT (form C) relays, rated at 120Vac or 28Vdc at 5 amperes. Each of
these relays is independently controlled by the field configurable setpoint and deadband.

The field configurable G168 limit alarm setpoints can be configured for HI or LO, failsafe or non-failsafe
operation. Each of the setpoints have a respective HI or LO deadband. In a tripped condition, the setpoint
is exceeded and the appropriate red LED will illuminate. The trip will reset only when the process falls below
the HI deadband or rises above the LO deadband (see Figure 1). For proper deadband operation, the HI
setpoint must always be set above the LO setpoint.
In failsafe operation, the relay is energized when the process is below the HI setpoint or above the LO set­point (opposite for non-failsafe). In the failsafe mode, a power failure results in an alarm state output.

LSI circuitry in the G168 prevents false trips by repeatedly sampling the input. The input must remain beyond
the setpoint for 100 milliseconds, uninterrupted, to qualify as a valid trip condition. Likewise, the input must
fall outside the deadband and remain there for 100 milliseconds to return the alarm to an untripped
condition. This effectively results in a "dynamic deadband" -based on time- in addition to the normal
deadband.

Table 1: G168 input range selector - switch settings

Key: n ON

Figure 1

+

Load

Relay

Conta cts

Diode

(optio nal)

Figure 2: DC Inductive Loads

Relay

Conta cts

Figure 3: AC Inductive Loads

47 ohm

1/2W

47 ohm

1/2W

Load

MOV

0.1uF

0.1uF

Film

Film

Power

Power

Input Range Selector

910

-

Current
Voltage