​​​​​​​​​​​​​Teledyne Hastings Instruments 2002, Instruction Manual, Page: 35 / 54

Model 2002 page 35
Relay Interface Option Board
SECTION 7
The relay interface board is available as an option for the Model 2002. Additionally, relays may
be added to either the Digital option Board (RS-232 or RS-485) or to the Analog option Board
(0-10 Volts or 4-20mA). In either case the relays operate independently of the other options. The
relay board allows the TTL logic setpoints (High, Low) to directly control two SPDT relays.
Whenever the setpoint indicator light in the front panel is lit, the corresponding relay is energized.
The relay contacts are rated for a maximum switching current of 250VA (resistive load). Connec-
tion to the relay contacts is made via connector mounted through the rear panel of the Model
2002. Screw terminals, on the mating connector, are designed for wire from 28 AWG through 14
AWG.
7.1 Relay Board Specifications
Each relay board consists of 2 Form C (SPDT) relays with the contacts wired in parallel.
Max. switching power --------------------------------------------------------------------- 120W, 250VA
(2A @ 125VAC, 1A @ 250VAC)
Max. switching voltage -------------------------------------------------------------- 220VDC, 250VAC
Max. switching current ---------------------------------------------------------------------- 4A DC, AC
Max . carrying current ----------------------------------------------------------------------- 6A DC, AC
UL/CSA rating -------------------------------------------------------------------------- 1.2A @ 125VAC
1.2A @ 110VDC
4.0A @ 30VDC
Figure 7.1
3 2 1
NO
NC
COMMON
Connector for Digital or Analog option,
or dummy connector if no option
is installed
HIGH SETPOINT
RELAY CONNECTOR
3 2 1
NO
NC
LOW SETPOINT
RELAY CONNECTOR
COMMON